## Big Ideas Math Book 1st Grade Answer Key Chapter 1 Addition and Subtraction Situations

### Addition and Subtraction Situations Vocabulary

**Oraganize it**

Use the review words to complete the graphic organizer

Answer:

GIVEN:

LABELLING:

**Define it**

Use your vocabulary cards to match.

Answer:

GIVEN:

EXPLANATION:

MATCHING :

### Lesson 1.1 Addition: Add To

**Explore and Grow**

Use linking cubes to model the story.

Answer:

GIVEN:

Number of bears = 4

Number of more bears added = 2

EXPLANATION:

ADDITION:

Total number of bears = Number of bears + Number of more bears added

=4 + 2 =6

Hence, Total number of bears = 6.

**Show and Grow**

Question 1.

Addition equation: __________ + ___________ = ___________

Answer:

GIVEN:

Number of cats = 5

Number of more cats added = 1

EXPLANATION:

ADDITION:

Total Number of cats = Number of cats + Number of more cats added

=5 + 1 = 6

Hence, total number of cats = 6.

**Apply and Grow: Practice**

Question 2.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of crabs = 3

Number of crabs added more = 6

EXPLANATION:

ADDITION:

Total number of crabs = Number of crabs + Number of crabs added more

=3 + 6 = 9

Hence, Total number of crabs = 9.

Question 3.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of pigs = 8

Number of pigs added more = 2

EXPLANATION:

ADDITION:

Total number of pigs = Number of pigs + Number of pigs added more

=8 + 2 = 10

Hence, Total number of pigs = 10.

Question 4.

**DIG DEEPER!**

Complete the picture and the story.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of owls in the picture = 3

Number of owls added more = 3

EXPLANATION:

ADDITION:

Total number of owls in the picture = Number of owls in the picture + Number of owls added more

=3 + 3 = 6

Hence, Total number of owls in the picture = 6.

**Think and Grow: Modeling Real Life**

Answer:

GIVEN:

Number of fishes = 5

Number of fishes added more = 3

EXPLANATION:

ADDITION:

Total number of fishes = Number of fishes + Number of fishes added more

=5 + 3 = 8

Hence, Total number of fishes = 8.

**Show and Grow**

Question 5.

Answer:

GIVEN:

Number of tortoise = 2

Number of tortoise added more = 7

EXPLANATION:

ADDITION:

Total number of tortoise = Number of tortoise + Number of tortoise added more

=2 + 7 = 9

Hence, total number of tortoise = 9.

### Addition: Add To Practice 1.1

Question 1.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of foxes = 6

Number of foxes added more = 1

EXPLANATION:

ADDITION:

Total number of foxes = Number of foxes + Number of foxes added more

=6 + 1 = 7

Hence, Total number of foxes = 7.

Question 2.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of bugs = 7

Number of bugs added more = 3

EXPLANATION:

ADDITION:

Total number of bugs = Number of bugs + Number of bugs added more

=7 + 3 = 10

Hence, Total number of bugs = 10.

Question 3.

**DIG DEEPER!**

__________ + ___________ = ___________

Answer:

GIVEN:

Number of parrots = 6

Number of parrots added more = 2

EXPLANATION:

ADDITION:

Total number of parrots = Number of parrots + Number of parrots added more

=6 + 2 = 8

Hence, Total number of parrots = 8.

Question 4.

Modeling Real Life

There are 2 . 7 more join them. How many are there now?

___________

Answer:

GIVEN:

Number of ducks = 2

Number of ducks added more = 7

EXPLANATION:

ADDITION:

Total number of ducks = Number of ducks + Number of ducks added more

= 2 + 7 = 9

Hence, Total number of ducks = 9.

**Review and Refresh**

Write the number of objects.

Question 5.

Answer:

GIVEN:

Apples in the picture.

COUNT:

Number of apples first row = 4

Number of apples second row = 3

EXPLANATION:

Total number of apples in both rows = Number of apples first row + Number of apples second row

= 4 + 3 = 7

Hence, Total number of apples in both rows = 7.

Question 5.

Answer:

GIVEN:

Bananas in the picture.

COUNT:

Number of Bananas first row = 4

Number of Bananas second row = 4

Number of Bananas third row = 2

EXPLANATION:

Total number of Bananas in all three rows = Number of Bananas first row + Number of Bananas second row + Number of Bananas third row

= 4 + 4 +2

= 8 + 2

= 10.

Hence, Total number of Bananas in all three rows = 10.

### Lesson 1.2 Solve Add To Problems

**Explore and Grow**

Use linking cubes to model the story.

Answer:

GIVEN:

Number of hats = 5

Number of hats added more = 2

EXPLANATION:

ADDITION:

Total number of hats = Number of hats + Number of hats added more

= 5 + 2 = 7

Hence, Total number of hats= 7.

**Show and Grow**

Question 1.

Addition equation:

__________ + ___________ = ___________

Answer:

GIVEN:

Number of balls = 4

Number of balls added more = 2

EXPLANATION:

ADDITION:

Total number of balls = Number of balls + Number of balls added more

= 4 + 2 = 6

Hence, number of balls = 6.

Question 2.

Addition equation:

__________ + ___________ = ___________

Answer:

GIVEN:

Number of rabbits = 4

Number of rabbits more added = 4

EXPLANATION:

ADDITION:

Total number of rabbits = Number of rabbits + Number of rabbits more added

= 4 + 4 = 8

Hence, number of rabbits = 8.

**Apply and Grow: Practice**

Question 3.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of books = 2

Number of books added more = 2

EXPLANATION:

ADDITION:

Total number of books = Number of books + Number of books added more

= 2 + 2 = 4

Hence, Total number of books = 4.

Question 4.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of ants = 3

Number of ants added more = 5

EXPLANATION:

ADDITION:

Total number of ants = Number of ants + Number of ants added more

= 3 + 5 = 8

Hence, Total number of ants = 8.

Question 5.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of chocolates eaten by me = 9

Number of chocolates eaten by me more = 1

EXPLANATION:

ADDITION:

Total number of chocolates eaten by me = Number of chocolates eaten by me + Number of chocolates eaten by me more

= 9 + 1 = 10.

Hence, Total number of chocolates eaten by me = 10.

Question 6.

**DIG DEEPER**

Complete the picture and the story

__________ + ___________ = ___________

Answer:

GIVEN:

Number of snails = 4

Number of snails added more = 3

EXPLANATION:

ADDITION:

Total number of snails = Number of snails + Number of snails added more

= 4 + 3 = 7

Hence, Total number of snails = 7.

**Think and Grow: Modeling Real Life**

Answer:

GIVEN:

Number of apples with me = 3

Number of apples I purchased = 7

EXPLANATION:

ADDITION:

Total number of apples I am having = Number of apples with me + Number of apples I purchased

= 3 + 7 = 10.

Hence, Total number of apples I am having = 10.

**Show and Grow**

Question 7.

Answer:

GIVEN:

Number of cube boxes = 6

Number of cube boxes more added given by your Friend= 3

EXPLANATION:

ADDITION:

Total number of cube boxes = Number of cube boxes + Number of cube boxes more added given by your Friend

= 6 + 3 = 9

Hence, Total number of cube boxes = 9.

### Solve Add To Problems Practice 1.2

Question 1.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of pencils = 2

Number of pencils purchased more = 3

EXPLANATION:

ADDITION:

Total number of pencils = Number of pencils + Number of pencils purchased more

= 2 + 3 = 5

Hence, Total number of pencils = 5.

Question 2.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of flowers = 6

Number of flowers added more = 4

EXPLANATION:

ADDITION:

Total number of flowers = Number of flowers + Number of flowers added more

= 6 + 4 = 10

Hence, Total number of flowers = 10.

Question 3.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of butterflies = 5

Number of butterflies added more = 4

EXPLANATION:

ADDITION:

Total number of butterflies = Number of butterflies + Number of butterflies added more

= 5 + 4 = 9

Hence, Total number of butterflies = 9.

Question 4.

**DIG DEEPER**

Complete the picture and the story.

__________ + ___________ = ___________

Answer:

GIVEN:

Number of Frogs = 7

Number of Frogs more added = 3

EXPLANATION:

ADDITION:

Total number of frogs = Number of Frogs + Number of Frogs more added

= 7 + 3 = 10

Hence, Total number of frogs = 10.

Question 5.

**Modeling Real Life**

You have 2 . You buy 4. How many do you have now?

_____________

Answer:

GIVEN:

Number of balls = 2

Number of balls purchased more = 4

EXPLANATION:

ADDITION:

Total number of balls = Number of balls + Number of balls purchased more

= 2 + 4 = 6

Hence, Total number of balls = 6.

**Review & Refresh**

Question 6.

Use the picture to complete the number bond.

Answer:

GIVEN:

Number of lemons = 6

Number of circle bonding given = 3

EXPLANATION:

DIVISION:

The picture of the number bond with lemons = 6/3 = 2 in each circle.

Hence, the picture is below:

### Lesson 1.3 Solve Put Together Problems

**Explore and Grow**

Use counters to model the story.

You have 7 and 2 . How many toys do you have in all?

______ toys

Answer:

GIVEN:

Number of robot toys =7

Number of car toys = 2

EXPLANATION:

ADDITION:

Total number of toys = Number of robot toys + Number of car toys

= 7 + 2 = 9

Hence, total number of toys = 9.

**Show and Grow**

Question 1.

You have 3 and 1 How many balls do you

Answer:

GIVEN:

Number of volleyballs = 3

Number of footballs = 1

EXPLANATION:

ADDITION:

Total number of balls = Number of volleyballs + Number of footballs

= 3 + 1 = 4

Hence, total number of balls = 4.

Question 2.

There are 2 and 6 How many fish are there in all?

Answer:

GIVEN:

Number of green fishes = 2

Number of yellow fishes = 6

EXPLANATION:

ADDITION:

Total number of fishes = Number of green fishes + Number of yellow fishes

= 2 + 6 =8

Hence, total number of fishes = 8.

Question 3.

You have 1 and 5 . How many pets do you have in all?

Answer:

GIVEN:

Number of dogs = 1

Number of cats = 5

EXPLANATION:

ADDITION:

Total number of pets = Number of dogs + Number of cats

= 1 + 5 = 6

Hence, total number of pets = 6.

Question 4.

There are 4 and 6 . How many animals are there in all?

Answer:

GIVEN:

Number of Horses = 4

Number of Hens = 6

EXPLANATION:

ADDITION:

Total number of animals = Number of Horses + Number of Hens

= 4 + 6 = 10

Hence, total number of animals = 10.

Question 5.

**MP Number Sense**

Number Sense Circle two groups of bugs to match the addition problem. Then ﬁnd the sum.

3 + 5 = __________

Answer:

**Think and Grow: Modeling Real Life**

You have 3 and 4 . Your friend has 8 flowers. Who has more flowers?

Model:

Addition equation:

Who has more flowers? You Friend

Show and Grow

Answer:

GIVEN:

Number of purple flower I am having = 3

Number of yellow flower I am having = 4

EXPLANATION:

ADDITION:

Total number of flowers I am having = Number of purple flower I am having + Number of yellow flower I am having

= 3 + 4 =7

Total Number of flowers my Friend having = 8

COMPARISION:

Number of flowers has more flowers = Total number of flowers I am having or Total Number of flowers my Friend having

=>

Hence, my Friend has more flowers than me.

Question 6.

You have 4 and 5 . Your friend has 7 leaves. Who has more leaves?

Model:

Addition equation:

Who has more leaves? You Friend

Answer:

GIVEN:

Number of orange leaves with me = 4

Number of green leaves with me= 5

EXPLANATION:

ADDITION:

Total number of leaves with me= Number of orange leaves with me + Number of green leaves with me

= 4 + 5 = 9

Total number of leaves my friend having = 7

COMPARISION:

Number of leaves who is having more = Total number of leaves with me or Total number of leaves my friend having

=

Hence, number of leaves with me are more than my friend.

### Solve Put Together Problems Practice 1.3

Question 1.

You buy 1 and 7 . How many pieces of fruit do you buy in all?

Answer:

GIVEN:

Number of pineapples purchased = 1

Number of bananas purchased = 7

EXPLANATION:

ADDITION:

Total number of fruits purchased = Number of pineapples purchased + Number of bananas purchased

= 1 + 7 = 8

Hence, Total number of fruits purchased = 8.

Question 2.

There are 5 and 5 . How many birds are there in all?

Answer:

GIVEN:

Number of koala birds = 5

Number of kuku birds = 5

EXPLANATION:

ADDITION:

Total number of birds = Number of koala birds + Number of kuku birds

= 5 + 5 = 10

Hence, Total number of birds = 10.

Question 3.

**MP Number Sense**

Circle two groups of hats to match the addition problem. Then find the sum.

6 + 1 = 7

Answer:

Question 4.

**Modeling Real Life**

You have 4 and 5 . You friend has 8 cars. Who has more cars?

Who has more cars? You Friend

Answer:

GIVEN:

Number of blue cars with me = 4

Number of yellow cars with me = 5

EXPLANATION:

ADDITION:

Total number of cars with me = Number of blue cars with me+ Number of yellow cars with me

= 4 + 5 = 9

Number of cars my friend has = 8

COMPARISION:

Number of cars who has more = Total number of cars with me or Number of cars my friend has

=

Hence, total number of cars with me are more than my friend.

**Review & Refresh**

Question 5.

Write the number for each type of pepper. Write the number for the whole.

Answer:

GIVEN:

Number of yellow pepper = 3 or three

Number of red pepper = 3 or three

EXPLANATION:

ADDITION:

Total number of pepper = Number of yellow pepper + Number of red pepper

= 3 + 3 = 6 or Six.

Hence, Total number of pepper = 6 or Six.

### Lesson 1.4 Solve Put Together Problems with Both Addends Unknown

**Explore and Grow**

Use linking cubes to model the story.

There are 10 . Some are on the court and some are on the rack .

Answer:

GIVEN:

Number of cubes on the court = 6

Number of cubes on the rack = 4

EXPLANATION:

ADDITION:

Total number of cubes = Number of cubes on the court + Number of cubes on the rack

= 6 + 4 = 10

Hence, total number of cubes = 10.

**Show and Grow**

Question 1.

There are 7 Some are on a tree. Some more are on the ground. Draw the

Addition equation: ________ = ________ + _______

Answer:

GIVEN:

Number of apples on the tree = 4

Number of apples on the ground = 3

EXPLANATION:

ADDITION:

Total number of apples = Number of apples on the tree + Number of apples on the ground

= 4 + 3 = 7.

PICTURE :

Hence, drawn the picture.

**Apply and Grow: Practice**

Question 2.

There are 5 Some are on a couch. Some more are on a rug. Draw the

Answer:

GIVEN:

Number of dogs on a couch = 3

Number of dogs on a rug = 2

EXPLANATION:

ADDITION:

Total number of dogs = Number of dogs on a couch + Number of dogs on a rug

= 3 + 2 = 5

PICTURE:

Hence, picture is drawn.

Question 3.

There are 8 Some are in a pond. Some more are in the grass. Draw two different pictures to show the

Answer:

GIVEN:

Total number of snakes = 8

FIGURE:1:

Number of snakes in a pond = 4

Number of snakes in a grass = 4

EXPLANATION:

ADDITION:

Total number of snakes = Number of snakes in a pond + Number of snakes in a grass

= 4 + 4 = 8

FIGURE:2:

Number of snakes in a pond = 3

Number of snakes in a grass = 5

Total number of snakes = Number of snakes in a pond + Number of snakes in a grass

= 3 + 5 = 8

PICTURE:

Hence, Total number of snakes = 8.

Question 4.

**DIG DEEPER!**

Newton has 4 toy trucks. Some are red. The rest are blue. Write two different addition equations to describe his trucks.

Answer:

GIVEN:

EQUATION:1:

Number of red trucks toys Newton has = 3

Number of blue trucks toys Newton has = 1

EXPLANATION:

ADDITION:

Total number of toy trucks Newton has = Number of red trucks toys Newton has + Number of blue trucks toys Newton has

= 3 + 1 =4.

Hence, total number of toy trucks Newton has = 4.

EQUATION:2:

Number of red trucks toys Newton has = 2

Number of blue trucks toys Newton has = 2

EXPLANATION:

ADDITION:

Total number of toy trucks Newton has = Number of red trucks toys Newton has + Number of blue trucks toys Newton has

= 2 + 2 =4.

Hence, total number of toy trucks Newton has = 4.

**Think and Grow: Modeling Real Life**

You have 7 ribbons. Some are blue. The rest are red. You have more blue ribbons than red ribbons. How many blue and red ribbons can you have?

2 blue 5 red 4 blue 3 red

6 blue 1 red 3 blue 4 red

Show how you know:

Answer:

Total number of ribbons = 7.

Some are blue and rest are red.

Blue ribbons are more than red ribbons.

EXPLANATION:

GIVEN:

1. 2 blue 5 red

Blue ribbons are more than red balls.

Number of blue ribbons are less than red.

Hence, this case is not the correct count of ribbons.

2. 4 blue 3 red

Number of blue ribbons are more than red.

Number of blue ribbons = 4

Number of red ribbons = 3

EXPLANATION:

ADDITION:

Total number of ribbons = Number of blue ribbons + Number of red ribbons

= 4 + 3 = 7.

Hence, this case is the correct count of ribbons.

3.6 blue 1 red

Blue ribbons are more than red balls.

Number of blue ribbons are more than red.

Number of blue ribbons = 6

Number of red ribbons = 1

EXPLANATION:

ADDITION:

Total number of ribbons = Number of blue ribbons + Number of red ribbons

= 6 + 1 = 7.

Hence, this case is the correct count of ribbons.

4. 3 blue 4 red

Number of blue ribbons are less than red.

So, this case is not the correct count of ribbons.

Hence, Total number of ribbons can be 4 blue 3 red if not 6 blue 1 red ball.

**Show and Grow**

Question 5.

There are lo kites. Some are green. The rest are yellow. There are more yellow kites than green kites. How many green and yellow kites can there be?

4 green 6 yellow 6 green 4 yellow

5 green 5 yellow 3 green 7 yellow

Answer:

GIVEN:

Total number of kites = 10.

Some are green and rest are yellow.

There are more yellow kites than green kites.

EXPLANATION:

1. 4 green 6 yellow

There are more yellow kites than green kites.

Number of green kites = 4

Number of yellow kites = 6

ADDITION:

Total number of kites = Number of green kites + Number of yellow kites

= 4 + 6 = 10.

2. 6 green 4 yellow

Here, number of green kites are more than yellow kites. So, this cannot be the count of kites.

3. 5 green 5 yellow

Here, both the number of green and yellow kites are same. This means the condition given is not fulfilled. So, this cannot be the count of kites.

4. 3 green 7 yellow

There are more yellow kites than green kites.

Number of green kites = 3

Number of yellow kites = 7

ADDITION:

Total number of kites = Number of green kites + Number of yellow kites

= 3 + 7 = 10.

Hence, the total number of kites can be 4 green 6 yellow or 3 green 7 yellow kites.

### Solve Put Together Problems with Both Addends Unknown Practice 1.4

Question 1.

There are 6 Some are on a hill. Some more are in the grass. Draw the

_____________ = ____________ + ____________

Answer:

Number of ants on hill = 4

Number of ants in the grass = 2

EXPLANATION:

ADDITION:

Total number of ants = Number of ants on hill + Number of ants in the grass

= 4 + 2 = 6

PICTURE:

Hence, Total number of ants = 6.

Question 2.

There are 8 Some are in the water. Some more are on the dirt. Draw the

_____________ = ____________ + ____________

Answer:

Number of frogs in the water = 3

Number of frogs on the dirt = 5

EXPLANATION:

ADDITION:

Total number of frogs = Number of frogs in the water+ Number of frogs on the dirt

= 3 + 5 = 8

PICTURE:

Hence, Total number of frogs = 8.

Question 3.

There are 5 . Some are inside a bin. Some more are outside the bin. Draw two different pictures to show the .

Answer:

PICTURE:1:

Number of balls are inside a bin = 1

Number of balls are outside the bin = 4

EXPLANATION:

ADDITION:

Total number of balls = Number of balls are inside a bin + Number of balls are outside the bin

= 1 + 4

=5

PICTURE:2:

Number of balls are inside a bin = 2

Number of balls are outside the bin = 3

EXPLANATION:

ADDITION:

Total number of balls = Number of balls are inside a bin + Number of balls are outside the bin

= 2 + 3

= 5

Hence, total number of balls = 5.

Question 4.

**Modeling Real Life**

You have 9 hats. Some are blue. The rest are red. You have more red hats than blue hats. How many red and blue hats can you have?

4 red 5 blue 6 red 3 blue

3 red 6 blue 7 red 2 blue

Show how you know:

Answer:

GIVEN:

Number of hats = 9

Some are blue. The rest are red.

You have more red hats than blue hats.

EXPLANATION:

1. 4 red 5 blue

Here, red are less than blue hats. So, this are not the count of hats.

2. 6 red 3 blue

Here, red are more than blue hats.

Number of red hats = 6

Number of blue hats = 3

ADDITION:

Total number of hats = Number of red hats + Number of blue hats

= 6 + 3 = 9

3. 3 red 6 blue

Here, red are less than blue hats. So, this are not the count of hats.

4. 7 red 2 blue

Here, red are more than blue hats.

Number of red hats = 6

Number of blue hats = 3

ADDITION:

Total number of hats = Number of red hats + Number of blue hats

= 6 + 3 = 9

Hence, Total number of hats can be 6 red 3 blue or 7 red 2 blue.

**Review & Refresh**

Use the picture to write a subtraction sentence.

Question 5.

___________ – ___________ = _____________

Answer:

Number of sea horse in first row = 4

Number of sea horse in second row = 4

EXPLANATION:

SUBTRACTION:

Difference in the rows = Number of sea horse in first row – Number of sea horse in second row

= 4 – 4 = 0

Hence, Difference in the rows = 0.

Question 6.

___________ – ___________ = _____________

Answer:

GIVEN:

Number of dolphins left side in the picture = 6

Number of dolphins right side in the picture = 3

EXPLANATION:

SUBTRACTION:

Difference in the dolphins in both the sides of the picture = Number of dolphins left side in the picture – Number of dolphins right side in the picture

= 6 – 3 = 3

Hence, Difference in the dolphins in both the sides of the picture = 3.

### Lesson 1.5 Solve Take From Problems

**Explore and Grow**

Use linking cubes to model the story.

There are 6 3 hop away How many are left.

Answer:

GIVEN:

Total number of rabbits = 6

Number of rabbits left away = 3

EXPLANATION:

SUBTRACTION:

Number of rabbits left = Total number of rabbits – Number of rabbits left away

= 6 – 3 = 3

Hence, Number of rabbits left = 3.

**Show and Grow**

Question 1.

There are 6 .

2 jump away.

How many are left?

Subtraction equation:

___________ – __________ = __________

Answer:

GIVEN:

Total number of monkeys = 6

Number of monkeys jump away = 3

EXPLANATION:

SUBTRACTION:

Number of monkeys left = Total number of monkeys – Number of monkeys jump away

= 6 – 3 = 3

Hence, Number of monkeys left = 3.

Question 2.

There are 8 .

A monkey eats 5

How many are left?

Subtraction equation:

___________ – __________ = __________

Answer:

GIVEN:

Total number of bananas = 8

Number of bananas monkey ate = 5

EXPLANATION:

SUBTRACTION:

Number of bananas left = Total number of bananas – Number of bananas monkey ate

= 8 – 5 = 3

Hence, Number of bananas left = 3.

**Apply and Grow: Practice**

Question 3.

There are 7 .

3 walk away.

How many are left?

___________ – __________ = __________

Answer:

Total number of ants = 7

Number of ants ran away = 3

EXPLANATION:

SUBTRACTION:

Number of ants left = Total number of ants – Number of ants ran away

= 7 – 3 = 4

Hence, Number of ants left = 4.

Question 4.

There are 8

6 fly away.

How many are left?

___________ – __________ = __________

Answer:

Total number of birds = 8

Number of birds flew = 6

EXPLANATION:

SUBTRACTION:

Number of birds left = Total number of birds – Number of birds flew

= 8 – 6 = 2.

Hence, Number of birds left = 2.

Question 5.

10 play.

5 run away.

How many are left?

___________ – __________ = __________

Answer:

Total number of cats = 10

Number of cats run cats = 5

EXPLANATION:

SUBTRACTION:

Number of cats left = Total number of cats – Number of cats run cats

= 10 – 5 = 5

Hence, Number of cats left = 5.

Question 6.

**MP Precision**

Find the difference. Draw a picture to match.

7 – 4 = ______

Answer:

7 – 4 = 3

EXPLANATION:

Out of 7 blocks remove 4 blocks = ????

DIFFERENCE

7 – 4 = 3

PICTURE:

Hence, picture is drawn.

**Think and Grow: Modeling Real Life**

7 students play tag.

2 of them leave.

How many students are left?

Which equation matches the story?

9 – 7 = 2

7 – 2 = 5

7 – 5 = 2

Show how you know:

____ students are left.

Answer:

GIVEN:

Total number of students playing tag = 7

Number of students left away = 2

EXPLANATION:

Number of students left = Total number of students playing tag – Number of students left away

= 7 – 2 = 5

Hence, Number of students left = 2

EQUATION matching the answer = 7 – 2 = 5 not others 9 – 7=2 nor 7 – 5 = 2.

**Show and Grow**

Question 7.

You have 9 coins. You give 3 coins away. How many coins are left?

Which equation matches the story?

9 – 3 = 6

6 – 3 = 3

Show how you know:

____ coins are left.

Answer:

GIVEN:

Total number of coins = 9

Number of coins given away = 3

EXPLANATION:

SUBTRACTION:

Number of coins left = Total number of coins – Number of coins given away

= 9 – 3

= 6

Hence, Number of coins left = 6.

EQUATION matching the story is 9 – 3 = 6 not 6 – 3 = 3.

### Solve Take From Problems Practice 1.5

Question 1.

There are 5

3 leave.

How many are left?

___________ – __________ = __________

Answer:

GIVEN:

Total number of tigers = 5

Number of tigers left away= 3

EXPLANATION:

SUBTRACTION:

Number of tigers left = Total number of tigers – Number of tigers left away

= 5 – 3

= 2

Hence, Number of tigers left = 2.

Question 2.

There are 7 .

A cat eats 5 .

How many are left?

___________ – __________ = __________

Answer:

GIVEN:

Total number of fishes = 7

Number of fishes cat ate = 5

EXPLANATION:

SUBTRACTION:

Number of fishes left = Total number of fishes – Number of fishes cat ate

= 7 – 5

= 2.

Hence, Number of fishes left = 2.

Question 3.

You have 10 .

You give away 10 .

How many do you have left?

___________ – __________ = __________

Answer:

GIVEN:

Total number of balls = 10

Number of balls given away = 10

EXPLANATION:

Number of balls left = Total number of balls – Number of balls given away

= 10 – 10

= 0

Hence, Number of balls left = 0.

Question 4.

**MP Precision**

Find the difference. Draw a picture to match.

8 – 2 = _______

Answer:

8 – 2 = 6

EXPLANATION:

Out of 8 blocks remove 2 blocks = ????

Difference:

8 – 2 = 6

PICTURE:

Hence, picture is drawn.

Question 5.

Modeling Real Life

6 students play soccer. 4 of them leave. How many students are left?

Which equation matches the story?

6 – 2 = 4

8 – 6 = 2

6 – 4 = 2

Show how you know:

____ students are left.

Answer:

GIVEN:

Total number of students playing soccer = 6

Number of students left away the soccer = 4

EXPLANATION:

SUBTRACTION:

Number of students left in the game = Total number of students playing soccer – Number of students left away the soccer

=6 – 4

=2

Hence, Equation matches our story is 6 – 4 = 2 not other 6 – 2 = 4, 8 – 6 = 2.

**Review & Refresh**

Question 6.

Write the numbers of dogs and bones. Circle the number that is greater than the other number.

Answer:

GIVEN:

Number of dogs = 7

Number of dog bones = 10

EXPLANATION:

COMPARISION:

Number of dogs : Number of dog bones

=>

Hence, comparison is done and greater number is also marked circle.

### Lesson 1.6 Solve Compare Problems: More

**Explore and Grow**

Use counters to model the story.

Newton has 4 apples. Descartes has 6 apples. Who has more apples? How many more?

Answer:

Number of apples Descartes has more than Number of apples Newton has.

Therefore, Descartes has 2 apples more than Newton has.

GIVEN:

Number of apples Newton has = 4

Number of apples Descartes has = 6

SUBTRACTION:

Number of apples who has more = Number of apples Descartes has – Number of apples Newton has

= 6 – 4

=2

Hence, Number of apples Descartes has more than Number of apples Newton has.

Therefore, Descartes has 2 apples more than Newton has.

**Show and Grow**

Question 1.

You have 7 books. Your friend has 3 books. How many more books do you have?

Subtraction equation: _________ – _________ = __________ more books

Answer:

I am having 4 books more than my friend has.

GIVEN:

Number of books I have = 7

Number of books my friend has = 3

EXPLANATION:

SUBTRACTION:

Number of books who has more = Number of books I have – Number of books my friend has

= 7 – 3

= 4

Hence, I am having 4 books more than my friend has.

**Apply and Grow: Practice**

Question 2.

Your friend has 6 crayons. You have 3 crayons. How many more crayons does your friend have?

_________ – _________ = __________ more crayons

Answer:

My friend has 3 crayons more than me.

GIVEN:

Number of crayons my friend has = 6

Number of crayons I am having = 3

EXPLANATION:

SUBTRACTION:

Number of crayons who has more by = Number of crayons my friend has – Number of crayons I am having

= 6 – 3

= 3

Hence, my friend has 3 crayons more than me.

Question 3.

There are 9 purple flowers and 5 yellow flowers. Draw the missing flowers. How many more purple flowers are there?

_________ – _________ = __________ more purple flowers

Answer:

Purples flowers are 4 more than the yellow flowers.

GIVEN:

Number of purple flowers = 9

Number of yellow flowers = 5

EXPLANATION:

SUBTRACTION:

Difference in the flowers = Number of purple flowers – Number of yellow flowers

= 9 – 5

=4.

PICTURE:

MISSING FLOWERS are 5 yellow flowers. Picture is below:

Hence, purples flowers are 4 more than the yellow flowers.

Question 4.

You have 2 yellow buckets. Your friend has 6 blue buckets. Draw the missing buckets. How many more buckets does your friend have?

_________ – _________ = __________ more buckets

Answer:

Number of more buckets my friend having than me are 4 blue buckets.

GIVEN:

Number of yellow buckets I am having = 2

Number of blue buckets my friend having = 6

EXPLANATION:

SUBTRACTION:

Number of more buckets does my friend having = Number of yellow buckets I am having – Number of blue buckets my friend having

= 6 – 2

= 4

PICTURE:

MISSING BUCKETS are 6 blue buckets. Picture is below:

Hence, Number of more buckets my friend having than me are 4 blue buckets.

**Think and Grow: Modeling Real Life**

You have 2 dog puppets. You have more cat puppets than dog puppets. How many more cat puppets do you have?

Draw a picture:

Subtraction equation:

___________ more cat puppets

Answer:

Cats are 1 more than dog puppets

GIVEN:

Number of dog puppets = 2

You have more cat puppets than dog puppets.

=> Number of cat puppets = 3

PICTURE:

EXPLANATION:

SUBTRACTION:

Number of cats more than dog puppets = Number of cat puppets – Number of dog puppets

= 3 – 2

=1

Hence, cats are 1 more than dog puppets.

**Show and Grow**

Question 5.

You have 9 toy cars. You have more cars than trucks. How many more cars do you have?

Draw a picture:

Subtraction equation:

__________ more toy cars

Answer:

Number of toy cars more than trucks = 1.

GIVEN:

Number of toy cars = 9

You have more cars than trucks.

=> Number of trucks = 8

PICTURE: MISSING TOYS are 8 trucks.

EXPLANATION:

SUBTRACTION:

Number of toy cars more than trucks =Number of toy cars – Number of trucks

= 9 – 8

= 1

Hence, Number of toy cars more than trucks = 1.

### Solve Compare Problems: More Practice 1.6

Question 1.

There are 4 blue scarves and 3 green scarves. How many more blue scarves are there?

____________ – ____________ = ___________ more blue scarf

Answer:

There are blue scarfs 1 more than red scarfs.

GIVEN:

Number of blue scarves = 4

Number of green scarves = 3

EXPLANATION:

SUBTRACTION:

Difference in the scarves = Number of blue scarves – Number of green scarves

= 4 – 3

= 1

Hence, there are blue scarfs 1 more than red scarfs.

Question 2.

You have 6 strawberries and 2 blueberries. Draw the missing fruit. How many more strawberries do you have?

____________ – ____________ = ___________ more straw berries

Answer:

There are 4 strawberries more than blue berries.

GIVEN:

Number of strawberries = 6

Number of blueberries = 2

PICTURE:

MISSING FRUITS are 2 blueberries.

EXPLANATION:

SUBTRACTION:

Difference in the berries = Number of strawberries – Number of blueberries

= 6 – 2

= 4

Hence, there are 4 strawberries more than blue berries.

Question 3.

You have 2 blue towels. Your friend has 7 red towels. Draw the missing towels. How many more towels does your friend have?

____________ – ____________ = ___________ more towels

Answer:

My friend has 5 red towels more than me.

GIVEN:

Number of blue towels I have = 2

Number of red towels my friend has = 7

PICTURE: MISSING TOWELS are 7 red towels.

EXPLANATION:

SUBTRACTION:

Difference in the towels between me and my friend = Number of red towels my friend has – Number of blue towels I have

= 7 – 2

= 5

Hence, my friend has 5 red towels more than me.

Question 4.

**Modeling Real Life**

You have 3 toy bears. You have more yo-yos than toy bears. How many more yo-yos do you have?

Answer:

There are 2 yo-yos more than toy bears.

GIVEN:

Number of toy bears = 3

You have more yo-yos than toy bears.

Number of yo-yos = 5

PICTURE: MISSING TOYS are 5 yo-yos. Picture is below:

EXPLANATION:

Difference in the toys = Number of yo-yos – Number of toy bears

= 5 – 3

= 2

Hence, there are 2 yo-yos more than toy bears.

**Review & Refresh**

Question 5.

Write the number of each type of sea creature. Draw a line through the number that is less than the other number.

Answer:

There are 2 jelly fishes more than star fishes.

GIVEN:

Number of star fish = 3Number of jelly fish = 5

EXPLANATION:

SUBTRACTION:

Difference in the fishes = Number of jelly fish – Number of star fish

= 5 – 3

=2

Hence, there are 2 jelly fishes more than star fishes.

### Lesson 1.7 Solve Compare Problems: Fewer

**Explore and Grow**

Use counters to model the story.

Newton has 7 games. Descartes has 5 games. Who has fewer games? How many fewer?

Answer:

Descartes has 2 games less than Newton has.

GIVEN:

Number of games Newton has = 7

Number of games Descartes has = 5

EXPLANATION:

SUBTRACTION:

Number of games who has more = Number of games Newton has – Number of games Descartes has

= 7- 5

= 2

Newton has more games than Descartes has.

Descartes has less games than Newton has.

Hence, Descartes has 2 games less than Newton has.

**Show and Grow**

Question 1.

There are 2 green pinwheels and 8 yellow pinwheels. How many fewer green pinwheels are there?

Subtraction equation: ___________ – __________ = ____________ fewer green pinwheels

Answer:

There are 6 green pinwheels.

GIVEN:

Number of green pinwheels = 2

Number of yellow pinwheels = 8

EXPLANATION:

SUBTRACTION:

Difference in the pinwheels = Number of yellow pinwheels – Number of green pinwheels

= 8 – 2

= 6.

Hence, there are 6 green pinwheels.

Question 2.

You have 3 key chains. Your friend has 7 key chains. How many fewer key chains do you have?

___________ – __________ = ____________ fewer key chains

Answer:

Number of fewer key chains I have are 4.

GIVEN:

Number of key chains I have = 3

Number of key chains my friend has = 7

EXPLANATION:

SUBTRACTION:

Number of fewer key chains I have = Number of key chains my friend has – Number of key chains I have

= 7 – 3

= 4

Hence, number of fewer key chains I have are 4.

Question 3.

There are 6 brown horses and 10 gray horses. Draw the missing horses. How many fewer brown horses are there?

___________ – __________ = ____________ fewer brown horses

Answer:

Number of fewer brown horses = 4.

GIVEN:

Number of brown horses = 6

Number of gray horses = 10

PICTURE: MISSING HORSES are 10 gray horses.

EXPLANATION:

SUBTRACTION:

Number of fewer brown horses = Number of gray horses – Number of brown horses

= 10 – 6

= 4

Hence, number of fewer brown horses = 4.

Question 4.

You have 8 red trains. Your friend has 5 orange trains. Draw the missing trains. How many fewer trains does your friend have?

___________ – __________ = ____________ fewer trains

Answer:

Number of fewer trains my friend has = 3.

GIVEN:

Number of red trains I have= 8

Number of orange trains my friend has = 5

PICTURE: MISSING TRAINS are 5 orange train.

EXPLANATION:

SUBTRACTION:

Number of fewer trains my friend has = Number of red trains I have – Number of orange trains my friend has

= 8 – 5

= 3

Hence, number of fewer trains my friend has = 3.

**Think and Grow: Modeling Real Life**

There are 10 hens. There are fewer chicks than hens. How many fewer chicks are there?

Draw a picture:

Subtraction equation:

________ fewer chicks

Answer:

Number of fewer chicks = 3.

GIVEN:

Number of hens = 10

There are fewer chicks than hens.

=> Number of chicks = 7

PICTURE:

EXPLANATION:

SUBTRACTION:

Number of fewer chicks = Number of hens – Number of chicks

= 10 – 7

= 3

Hence, Number of fewer chicks = 3.

**Show and Grow**

Question 5.

There are 4 pigs. There are fewer pigs than piglets. How many fewer pigs are there?

Draw a picture:

Subtraction equation:

_________ fewer pigs

Answer:

Number of fewer pigs = 3.

GIVEN:

Number of pigs = 4

There are fewer pigs than piglets.

Number of piglets = 7

PICTURE:

EXPLANATION:

SUBTRACTION:

Number of fewer pigs = Number of piglets – Number of pigs

= 7 – 4

= 3

Hence, Number of fewer pigs = 3.

### Solve Compare Problems: Fewer Practice 1.7

Question 1.

There are 7 black bears and 8 brown bears. How many fewer black bears are there?

___________ – __________ = ____________ fewer black bears

ANSWER:

Number of black bears = 1.

GIVEN:

Number of black bears = 7

Number of brown bears = 8

EXPLANATION:

SUBTRACTION:

Number of fewer black bears = Number of brown bears – Number of black bears

= 8 – 7

= 1

Hence, Number of black bears = 1.

Question 2.

You have 4 purple blocks. Your friend has 9 yellow blocks. Draw the missing blocks. How many fewer blocks do you have?

___________ – __________ = ____________ fewer blocks

Answer:

Number of fewer blocks = 5.

GIVEN:

Number of purple blocks = 4

Number of yellow blocks = 9

PICTURE: MISSING BLOCKS are 9 yellow blocks.

EXPLANATION:

SUBTRACTION:

Number of fewer blocks = Number of purple blocks – Number of yellow blocks

= 9 – 4

=5

Hence, Number of fewer blocks = 5.

Question 3.

There are 7 orange kittens and 2 black kittens. Draw the missing kittens. How many fewer black kittens are there?

___________ – __________ = ____________ fewer black kittens

Answer:

Number of fewer kittens = 5.

GIVEN:

Number of orange kittens = 7

Number of black kittens = 2

PICTURE: MISSING KITTENS are 2 black kittens .

EXPLANATION:

SUBTRACTION:

Number of fewer kittens = Number of orange kittens – Number of black kittens

= 7 – 2

= 5

Hence, Number of fewer kittens = 5.

Question 4.

**Modeling Real Life**

There are 9 lions. There are fewer cubs than lions. How many fewer cubs are there?

_____________ fewer cubs

Answer:

There are 5 fewer cubs than lions.

GIVEN:

Number of lions = 9

There are fewer cubs than lions.

=> Number of cubs = 4

EXPLANATION:

SUBTRACTION:

Number of fewer cubs = Number of lions – Number of cubs

= 9 – 4

= 5

Hence, there are 5 fewer cubs than lions.

**Review and Refresh**

Draw more counters to show how many in all. Use the ten frame to complete the addition equation.

Question 5.

Answer:

5 + 2 = 7.

GIVEN:

EXPLANATION:

Let the missing number be X.

ADDITION EQUATION:

5 + X= 7

=> X = 7 – 5

=> X = 2

PICTURE:

Hence, 5 + 2 = 7.

Question 6.

Answer:

5 + 4 = 9.

GIVEN:

EXPLANATION:

Let the missing number be X

ADDITION EQUATION:

5 + X = 9

=> X = 9 – 5

=> X = 4

PICTURE:

Hence, EQUATION is 5 + 4 = 9.

### Lesson 1.8 Solve Add To Problems with Change Unknown

**Explore and Grow**

Use counters to model the story.

5 people are on a subway. Some more people get on at the subway stop. Now there are 8 people on the subway. How many people got on at the subway stop?

Answer:

Number of people got on at the subway stop = 3.

GIVEN:

Number of people in the train = 5

Total number of people present in the train = 8

EXPLANATION:

SUBTRACTION:

Number of people got on at the subway stop = Total number of people present in the train – Number of people in the train

= 8 – 5

= 3

Hence, Number of people got on at the subway stop = 3.

**Show and Grow**

Question 1.

You have 3 oranges. You buy some more. Now you have 6. How many oranges did you buy?

Addition equation: __________ + _________ = ___________ oranges

Answer:

Number of oranges I purchased = 3.

GIVEN:

Number of oranges I have = 3

Number of oranges I am having after buying = 6

EXPLANATION:

SUBTRACTION:

Number of oranges I purchased = Number of oranges I have – Number of oranges I am having after buying

= 6 – 3

= 3

PICTURE:

Hence, Number of oranges I purchased = 3.

**Apply and Grow: Practice**

Question 2.

5 kids are in a pool. Some more jump in. Now there are 7 kids. How many kids jumped in the pool?

__________ + _________ = ___________ kids

Answer:

Number of kids jumped in the pool = 2.

GIVEN:

Number of kids in pool = 5

Total number of kids at present = 7

EXPLANATION:

SUBTRACTION:

Number of kids jumped in the pool = Total number of kids at present – Number of kids in pool

= 7 – 5

= 2

Hence, Number of kids jumped in the pool = 2.

Question 3.

You hop 6 times. You hop some more times. You hop 10 times in all. How many more times did you hop?

__________ + _________ = ___________ times

Answer:

Number of more times I hopped = 4.

GIVEN:

Number of times I hoped = 6

Total number of times I hopped = 10

EXPLANATION:

SUBTRACTION:

Number of more times I hopped = Number of times I hoped – Total number of times I hopped

= 10 – 6

= 4

PICTURE:

Hence, Number of more times I hopped = 4.

Question 4.

**MP Structure**

Structure Circle the model that shows the missing number.

Answer:

2 + 5 = 7.

GIVEN:

2 + ____= 7

EXPLANATION:

Let the missing number be X.

ADDITION:

2 + X = 7

=> X = 7 – 2

=> X = 5.

The Equation is 2 + 5 = 7.

**Think and Grow: Modeling Real Life**

You catch 2 fish before lunch. You catch some more after lunch. You catch 10 in all. How many fish did you catch after lunch?

Model:

Addition equation:

_________ fish

Answer:

Number of fishes caught after lunch = 8.

GIVEN:

Number of fishes caught before lunch = 2

Total number of fishes present after lunch = 10

PICTURE:

EXPLANATION:

SUBTRACTION:

Number of fishes after lunch = Total number of fishes present after lunch – Number of fishes caught before lunch

= 10 – 2

= 8

Hence, Number of fishes caught after lunch = 8.

**Show and Grow**

Question 5.

You read 7 books. You read 4 on Monday. You read the rest on Tuesday. How many books do you read on Tuesday?

Model:

Addition equation:

__________ books

Answer:

Number of books I read on Tuesday = 3.

GIVEN:

Total number of books I read = 7

Number of books I read on Monday = 4

EXPLANATION:

SUBTRACTION:

Number of books I read on Tuesday = Total number of books I read – Number of books I read on Monday

= 7 – 4

= 3

PICTURE:

Hence, Number of books I read on Tuesday = 3.

### Solve Add To Problems with Change Unknown Practice 1.8

Question 1.

2 kids ride bikes to the park. Some more kids walk to the park. Now there are 6 kids at the park. How many kids walked to the park?

__________ + _________ = ___________ kids

Answer:

Number of kids walked to the park = 4.

GIVEN:

Number of kids ride on bikes to park = 2

Total number of kids present in the park =6

PICTURE:

EXPLANATION:

SUBTRACTION:

Number of kids walked to the park = Total number of kids present in the park – Number of kids ride on bikes to park

= 6 – 2

= 4

Hence, Number of kids walked to the park = 4.

Question 2.

You have 5 stamps. You buy some more. Now you have 8. How many stamps did you buy?

__________ + _________ = ___________ stamps

Answer:

Number of stamps I purchased = 3.

GIVEN:

Number of stamps I have = 5

Total number of stamps I have presently = 8

PICTURE:

EXPLANATION:

SUBTRACTION:

Number of stamps I purchased = Total number of stamps I have presently – Number of stamps I have

= 8 – 5

= 3

Hence, Number of stamps I purchased = 3.

Question 3.

**MP Structure**

Circle the model that shows the missing number.

4 + _____ = 10

Answer:

EQUATION is 4 + 6 = 10 not (1 + 5 = 6) nor (4 + 2= 6).

GIVEN:

4 + ____ = 10

EXPLANATION:

Let the missing number be X.

=> 4 + X = 10

ADDITION:

=> 4 + X = 10

=> X = 10 – 4

=>X = 6

Missing number = 6

PICTURE:

Hence, EQUATION is 4 + 6 = 10 not (1 + 5 = 6) nor (4 + 2= 6).

Question 4.

**Modeling Real Life**

You tell 7 jokes. You tell some more jokes. You tell 10 jokes in all. How many more jokes did you tell?

Answer:

Number of jokes I told more later = 3.

GIVEN:

Number of jokes I told = 7

Total number of jokes I told in all = 10

EXPLANATION:

SUBTRACTION:

Number of jokes I told more later = Total number of jokes I told in all – Number of jokes I told

= 10 – 7

= 3

PICTURE:

Hence, Number of jokes I told more later = 3.

**Review & Refresh**

Question 5.

Write the numbers of bears and honey pots. Are the numbers equal? Circle the thumbs up for yes or the thumbs down for no.

Answer:

Number of bears and number of honey pots are not same.

GIVEN:

Number of bears in the picture = 9

Number of honey pots in the picture = 8

Hence, number of bears and number of honey pots are not same.

PICTURE:

### Lesson 1.9 Connect Put Together and Take Apart Problems

**Explore and Grow**

Use counters to model the story.

There are 9 geese. 4 are flying. The rest are on the ground. How many geese are on the ground?

Answer:

Number of geese are on the ground = 5.

GIVEN:

Number of geese = 9

Number of geese flying = 4

EXPLANATION:

SUBTRACTION:

Number of geese are on the ground = Number of geese – Number of geese flying

= 9 – 4

= 5

PICTURE:

Hence, Number of geese are on the ground = 5.

**Show and Grow**

Question 1.

You have 8 beads. 5 are pink. The rest are orange. How many orange beads do you have?

__________ + _________ = ___________ orange beads

__________ – _________ = ___________ orange beads

Answer:

Number of beads in orange color = 3.

GIVEN:

Total number of beads = 8

Number of beads in pink color = 5

EXPLANATION:

SUBTRACTION:

Number of beads in orange color = Total number of beads – Number of beads in pink color

= 8 – 5

= 3

PICTURE:

Hence, Number of beads in orange color = 3.

**Apply and Grow: Practice**

Question 2.

You have 9 rings. 7 are green. The rest are orange. How many orange rings do you have?

__________ + _________ = ___________ orange rings

__________ – _________ = ___________ orange rings

Answer:

Number of orange rings = 2.

GIVEN:

Total number of rings = 9

Number of green rings = 7

EXPLANATION:

SUBTRACTION:

Number of orange rings = Total number of rings – Number of green rings

= 9 – 7

= 2

PICTURE:

Hence, Number of orange rings = 2.

Question 3.

There are 3 spiders in a tree. Some more are on the ground. There are 10 spiders in all. How many spiders are on the ground?

__________ + _________ = ___________ spiders

__________ – _________ = ___________ spiders

Answer:

Number of spiders on the ground = 7.

GIVEN:

Number of spiders in a tree = 3

Total number of spiders in all = 10

EXPLANATION:

SUBTRACTION:

Number of spiders on the ground = Total number of spiders in all – Number of spiders in a tree

= 10 – 3

= 7

PICTURE:

Hence, Number of spiders on the ground = 7.

Question 4.

**MP Structure**

10 students play instruments. 6 play drums. The rest play flutes. How many students play flutes? Use the model to write an equation and solve.

_________ ○ _________ = ____________ students

Answer:

Number of students play flutes = 4.

GIVEN:

Total number of students play instruments = 10

Number of students play drums = 6

EXPLANATION:

SUBTRACTION:

Number of students play flutes = Total number of students play instruments – Number of students play drums

= 10 – 6

= 4

PICTIURE:

Hence, Number of students play flutes = 4.

**Think and Grow: Modeling Real Life**

There are 8 students at a playground. 2 are on the slides. The rest are on the swings. How many students are on the swings?

Which equations match the story?

10 – 2 = 8

8 – 2 = 6

2 + 6 = 8

8 + 2 = 10

Show how you know:

________ students are on the swings

Answer:

EQUATION is 8 – 2 = 6 not 10 – 2 = 8, 2 + 6 = 8, 8 + 2 = 10.

GIVEN:

Number of students at a playground = 8

Number of students on the slides = 2

EXPLANATION:

SUBTRACTION:

Number of students on the swings = Number of students at a playground – Number of students on the slides

= 8 – 2

= 6

So, Number of students on the swings = 6.

Hence, EQUATION is 8 – 2 = 6 not 10 – 2 = 8, 2 + 6 = 8, 8 + 2 = 10.

Question 5.

Your teacher has 5 outdoor toys. 2 are flying discs. The rest are jump ropes. How many jump ropes are there?

Which equations match the story?

5 + 2 = 7

7 – 2 = 5

2 + 3 = 5

5 – 2 = 3

Show how you know:

There are ______ jump ropes.

Answer:

EQUATION is 5 – 2 = 3 not 5 + 2 = 7, 7 – 2 = 5, 2 + 3 = 5.

GIVEN:

Number of outdoor toys = 5

Number of flying discs = 2

EXPLANATION:

SUBTRACTION:

Number of jump ropes = Number of outdoor toys – Number of flying discs

= 5 – 2

= 3

So, Number of jump ropes = 3.

Hence, EQUATION is 5 – 2 = 3 not 5 + 2 = 7, 7 – 2 = 5, 2 + 3 = 5.

### Connect Put Together and Take Apart Problems Practice 1.9

Question 1.

You have 8 markers. 2 are purple. The rest are blue. How many blue markers do you have?

__________ + _________ = ___________ blue markers

__________ – _________ = ___________ blue markers

Answer:

Number of blue markers = 6.

GIVEN:

Total number of markers = 8

Number of purple markers = 2

EXPLANATION:

SUBTRACTION:

Number of blue markers = Total number of markers – Number of purple markers

= 8 -2

= 6

PICTURE:

Hence, Number of blue markers = 6.

Question 2.

There are 6 alligators. 3 are in a swamp. The rest are in the grass. How many alligators are in the grass?

__________ + _________ = ___________ alligators

__________ – _________ = ___________ alligators

Answer:

Number of alligators in the grass = 3.

GIVEN:

Total number of alligators = 6

Number of alligators in a swamp = 3

EXPLANATION:

SUBTRACTION:

Number of alligators in the grass = Total number of alligators – Number of alligators in a swamp

= 6 – 3

= 3

PICTURE:

Hence, Number of alligators in the grass = 3.

Question 3.

**MP Structure**

There are 2 chickens inside a coop. Some more are outside the coop. There are 10 chickens in all. How many chickens are outside the coop? Use the model to write an equation and solve.

_________ ○ _________ = ____________ chickens

Answer:

Number of chickens outside the coop = 8.

GIVEN:

Number of chickens inside a coop = 2

Total number of chickens in all = 10

EXPLANATION:

SUBTRACTION:

Number of chickens outside the coop = Total number of chickens in all – Number of chickens inside a coop

=10 – 2

= 8

PICTURE:

Hence, Number of chickens outside the coop = 8.

Question 4.Modeling Real Life

Your teacher has 7 balls. 2 are soccer balls. The rest are basketballs. How many basketballs are there?

Which equations match the story?

7 – 2 = 5

9 – 2 = 7

7 + 2 = 9

2 + 5 = 7

Show how you know:

There are _____ basketballs.

Answer:

EQUATION is 7 – 2 = 5 not 9 – 2 = 7, 7 + 2 = 9, 2 + 5 = 7.

GIVEN:

Total number of balls = 7

Number of soccer balls = 2

EXPLANATION:

SUBTRACTION:

Number of basketballs = Total number of balls – Number of soccer balls

= 7 – 2

= 5

So, Number of basketballs = 5.

Hence, EQUATION is 7 – 2 = 5 not 9 – 2 = 7, 7 + 2 = 9, 2 + 5 = 7.

**Review & Refresh**

Find the sum.

Question 5.

6 + 0 = ______

Answer:

Sum of 6 + 0 = 6.

GIVEN:

6 + 0 =____.

EXPLAINATION:

There are 6 counters in each group

Total number of groups = 0

Add the number of groups

6 + 0 = 6.

Question 6.

0 + 0 = ______

Answer:

Sum of 0 + 0 = 0.

GIVEN:

0 + 0 = ___

EXPLAINATION:

There are 0 counters in each group

Total number of groups = 0

Add the number of groups

0 + 0 = 0.

Question 7.

5 + 1 = _______

Answer:

Sum of 5 + 1 = 6.

GIVEN:

5 + 1 = _____

EXPLAINATION:

There are 5 counters in each group

Total number of groups = 1

Add the number of groups

5 + 1 = 6.

Question 8.

9 + 1 = ______

Answer:

Sum of 9 + 1 = 10.

GIVEN:

9 + 1 =____

EXPLAINATION:

There are 6 counters in each group

Total number of groups = 0

Add the number of groups

9 + 1 = 10.

### Addition and Subtraction Situations Performance Task

Question 1.

3 birds are on a wire. 5 birds are on a branch.

(a) 2 more birds land on the wire. How many birds are on the wire now?

__________ birds

Answer:

Total number of birds are on a wire now = 5.

GIVEN:

Number of birds are on a wire = 3

Number of birds added more are on a wire = 2

EXPLANATION:

ADDITION:

Total number of birds are on a wire now = Number of birds are on a wire – Number of birds added more are on a wire = 3 + 2

= 5

Hence, Total number of birds are on a wire now = 5.

(b)

I bird flies away from the branch. How many birds are on the branch now?

__________ birds

Answer:

Number of birds are on the branch now = 4.

GIVEN:

Number of birds on the branch = 5

Number of birds flew away from branch = 1

EXPLANATION:

SUBTRACTION:

Number of birds are on the branch now = Number of birds on the branch – Number of birds flew away from branch

= 5 – 1

= 4

Hence, Number of birds are on the branch now = 4.

(c)

How many more birds are on the wire now than on the branch now?

__________ more birds

Answer:

Number of birds are on the wire now more than on the branch now = 1.

GIVEN:

Number of birds are on the wire now = 5

Number of birds are on the branch now = 4

EXPLANATION:

SUBTRACTION:

Number of birds are on the wire now more than on the branch now = Number of birds are on the wire now – Number of birds are on the branch now

= 5 – 4

= 1.

Hence, Number of birds are on the wire now more than on the branch now = 1.

Question 2.

There are 6 birds. Draw some on the wire and some on the branch. Write an addition equation and a subtraction equation to match your picture.

Answer:

SUBTRACTION EQUATION = 6 – 3 = 3.

ADDITION EQUATION = 3 + 3 = 6.

GIVEN:

Total number of birds = 6

Number of birds on the wire = 3

EXPLANATION:

SUBTRACTION:

Number of birds on the branch = Total number of birds – Number of birds on the wire

= 6 – 3

= 3

Hence, SUBTRACTION EQUATION = 6 – 3 = 3.

ADDITION:

Total number of birds = Number of birds on the wire + Number of birds on the branch

= 3 + 3

= 6

Hence, ADDITION EQUATION = 3 + 3 = 6.

PICTURE:

### Addition: Add To Practice Homework & Practice 1.1

Question 1.

There are 4 .

2 more join them.

Now there are _______ .

___________ + ___________ = ___________

Answer:

Total number of frogs now = 6.

GIVEN:

Total number of frogs = 4

Number of frogs joined more = 2

EXPLANATION:

ADDITION:

Total number of frogs now = Total number of frogs + Number of frogs joined more

= 4 + 2

= 6

Hence, Total number of frogs now = 6.

### Solve Add To Problems Homework & Practice 1.2

Question 2.

There are 5 .

3 more join them.

How many are there now?

___________ + ___________ = ___________

Answer:

Total number of octopus now = 8.

GIVEN:

Total number of octopus = 5

Number of octopus joined more = 3

EXPLANATION:

ADDITION:

Total number of octopus now = Total number of octopus – Number of octopus joined more

= 5 + 3

= 8

Hence, Total number of octopus now = 8.

Question 3.

**Modeling Real Life**

You have 3 . Your friend gives you I . How many do you have now?

____________

Answer:

Total number of crayons I have now = 4.

GIVEN:

Number of crayons I have = 3

Number of crayons my friend gave me = 1

EXPLANATION:

ADDITION:

Total number of crayons I have now = Number of crayons I have – Number of crayons my friend gave me

= 3 + 1

= 4

Hence, Total number of crayons I have now = 4.

### Solve Put Together Problems Homework & Practice 1.3

Question 4.

You have 4 and 4 . How many flowers do you have in all?

___________ + ___________ = ___________ flowers

Answer:

Total number of flowers in all = 8.

GIVEN:

Number of pink color flowers = 4

Number of blue color flowers = 4

EXPLANATION:

ADDITION:

Total number of flowers in all = Number of pink color flowers – Number of blue color flowers

= 4 + 4

= 8

PICTURE:

Hence, Total number of flowers in all = 8.

### Solve Put Together Problems with Both Addends Unknown Homework & Practice 1.4

Question 5.

There are 10 . Some are standing up. The rest are knocked down. Draw two different pictures to show the

Answer:

FIGURE:1: Number of knocked down bowls = 4.

FIGURE:2: Number of knocked down bowls = 5.

GIVEN:

FIGURE:1:

Number of bowls = 10

Number of standing bowls = 6

EXPLANATION:

SUBTRACTION:

Number of knocked down bowls = Number of bowls – Number of standing bowls

= 10 – 6

= 4

Hence, Number of knocked down bowls = 4.

FIGURE:2:

Number of bowls = 10

Number of standing bowls = 5

EXPLANATION:

SUBTRACTION:

Number of knocked down bowls = Number of bowls – Number of standing bowls

= 10 – 5

= 5

Hence, Number of knocked down bowls = 5.

PICTURE:

### Solve Take From Problems Homework & Practice 1.5

Question 6.

There are 7

3 swim away.

How many are left?

___________ – ___________ = ___________

Answer:

Number of dolphins left = 4.

GIVEN:

Total number of dolphins = 7

Number of dolphins swam away = 3

EXPLANATION:

SUBTRACTION:

Number of dolphins left = Total number of dolphins – Number of dolphins swam away

= 7 – 3

= 4

Hence, Number of dolphins left = 4.

### Solve Compare Problems: More Homework & Practice 1.6

Question 7.

You have 6 whistles. Your friend has 3 whistles. How many more whistles do you have?

___________ – ___________ = ___________ more whistles

Answer:

Number of whistles I have more than my friend = 3.

GIVEN:

Total number of whistles I have = 6

Number of whistles my friend has = 3

EXPLANATION:

SUBTRACTION:

Number of whistles I have more than my friend = Total number of whistles I have – Number of whistles my friend has = 6 – 3

= 3

Hence, Number of whistles I have more than my friend = 3.

Question 8.

There are 2 yellow blankets and 9 green blankets. Draw the missing blankets. How many more green blankets are there?

___________ – ___________ = ___________ more green blankets

Answer:

Number of green blankets more than yellow blankets = 7.

GIVEN:

Number of yellow blankets = 2

Number of green blankets = 9

EXPLANATION:

SUBTRACTION:

Number of green blankets more than yellow blankets = Number of green blankets – Number of yellow blankets

= 9 – 2

= 7

PICTURE: MISSING BLANKETS are 9 green blankets.

Hence, Number of green blankets more than yellow blankets = 7.

### Solve Compare Problems: Fewer Homework & Practice 1.7

Question 9.

You have 5 puzzles. Your friend has 7 puzzles. How many fewer puzzles do you have?

___________ – ___________ = ___________ fewer puzzles

Answer:

Number of fewer puzzles I have = 2.

GIVEN:

Number of puzzles I have = 5

Number of puzzles my friend has = 7

EXPLANATION:

SUBTRACTION:

Number of fewer puzzles I have = Number of puzzles my friend has – Number of puzzles I have

= 7 – 5

= 2

Hence, Number of fewer puzzles I have = 2.

Question 10.

There are 8 red leaves and 4 orange leaves. Draw the missing leaves. How many fewer orange leaves are there?

___________ – ___________ = ___________ fewer orange leaves

Answer:

Number of fewer orange leaves = 4.

GIVEN:

Number of red leaves = 8

Number of orange leaves = 4

EXPLANATION:

SUBTRACTION:

Number of fewer orange leaves = Number of red leaves – Number of orange leaves

= 8 – 4

= 4

PICTURE: MISSING LEAVES are orange leaves.

Hence, Number of fewer orange leaves = 4.

### Solve Add To Problems with Change Unknown Homework & Practice 1.8

Question 11.

You have 3 bracelets. Your friend gives you some more. Now you have 9 How many bracelets did your friend give you?

___________ + ___________ = ___________ bracelets

Answer:

Number of bracelets my friend gave me = 6.

GIVEN:

Number of bracelets I have = 3

Total number of bracelets my friend gave me more after = 9

EXPLANATION:

SUBTRACTION:

Number of bracelets my friend gave me = Total number of bracelets my friend gave me more after – Number of bracelets I have

= 9 – 3

= 6

PICTURE:

Hence, Number of bracelets my friend gave me = 6.

Question 12.

You have 5 carrots. You buy some more. Now you have 10. How many carrots did you buy?

___________ + ___________ = ___________ carrots

Answer:

Number of carrots I purchased = 5.

GIVEN:

Total number of carrots I have = 5

Total number of carrots I have now = 10

EXPLANATION:

SUBTRACTION:

Number of carrots I purchased = Total number of carrots I have now – Total number of carrots I have

= 10 – 5

= 5

PICTURE:

Hence, Number of carrots I purchased = 5.

### Connect Put Together and Take Apart Problems Homework & Practice 1.9

Question 13.

You have 4 hats. 2 have polka dots. The rest have stripes. How many striped hats do you have?

___________ + ___________ = __________ striped hats

___________ – ___________ = ___________ striped hats

Answer:

Number of stripes hats I have = 2.

GIVEN:

Total number of hats I have = 4

Number of polka dots hats I have = 2

EXPLANATION:

SUBTRACTION:

Number of stripes hats I have = Total number of hats I have – Number of polka dots hats I have

= 4 – 2

= 2

PICTURE:

Hence, Number of stripes hats I have = 2.