Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key

The solutions to Bridges in Mathematics Grade 3 Student Book Answer Key Unit 2 Module 1 can help students to clear their doubts quickly.

Bridges in Mathematics Grade 3 Student Book Answer Key Unit 2 Module 1

Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Session 1 Answer Key

Addition & Subtraction: Mixed Review

Story Problems

Question 1.
Alejandro is making designs with pattern blocks. His first design has 14 pattern blocks. His second design has 8 pattern blocks. How many more blocks are in his first design than in his second design?

a. Solve the problem using numbers, pictures, or words.
Answer:
Alejandro is making designs with pattern blocks. His first design has 14 pattern blocks.
His second design has 8 pattern blocks.
14 – 8 = 6 blocks

b. Write an equation for this problem.
Answer:
14 – 8 = 6

Question 2.
Elizabeth is also making designs with pattern blocks. Her first design has 17 pattern blocks, and her second design has 15 pattern blocks. How many pattern blocks did she use in all?

a. Solve the problem using numbers, pictures, or words.
Answer :
Elizabeth is also making designs with pattern blocks. Her first design has 17 pattern blocks.
Her second design has 15 pattern blocks.
Total number of blocks : 17 + 15 = 32

b. Write an equation for this problem.
Answer: 17 + 15 = 32

Repeated Addition

Question 3.
Solve the following problems:
5 + 5 + 5 + 5 + 5 = _____ 3 + 3 + 3 = ____ 6 + 6 + 6 + 6 = _______
2 + 2 + 2 + 2 = ________ 9 + 9 + 9 = _____ 4 + 4 + 4 + 4 + 4 = ______
Answer:
Repeated addition is to add equal groups or the same number over and over.
5 + 5 + 5 + 5 + 5 = 25
By adding 5 5’s we get 25.
3+3+3 = 9
By adding 3 for 3 times we get 9.
6 + 6 + 6 + 6 = 24
By adding 6 for 4 times we get 24.
2 + 2 + 2 + 2 = 8
By adding 2 for 4 times we get 8.
9 + 9 + 9 = 27
By adding 9 for 3 times we get 27.
4 + 4 + 4 + 4 + 4 = 20.
By adding 4 for 5 times we get 20.

Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Session 2 Answer Key

Missing Numbers Fill In

Question 1.
Fill in the missing numbers in the Make Ten addition facts.
5 + ___ = 10 ___ + 3 = 10 6 + ___ = 10 10 = ___ + 8
0 + ___ = 10 9 + ___ = 10 10 = ___ + 7 10 = 4 + ____
Answer:
5 + 5 = 10
By adding 5 and 5 we get 10.
7 + 3 = 10
By adding 7 and 3 we get 10.
6 + 4= 10
By adding 6 and 4 we get 10.
10 = 2+ 8
By adding 2 and 8 we get 10.
0 + 10= 10
By adding 0 and 10 we get 10.
9 + 1 = 10
By adding 9 and 1 we get 10.
10 = 3+ 7
By adding 3 and 7 we get 10.
10 = 4 + 6
By adding 4 and 6 we get 10.

Question 2.
Fill in the missing numbers in the equations below:
2 + ____ = 4 16 = ___ + 8 6 = 3 + ___ ___ = 9 + 9
5 + ___ = 10 ____ + 6 = 12 8 = ____ + 4 7 + 7 = ___
Answer:
2 + 2 = 4
By adding 2 and 2 we get 4.
16 = 8 + 8
By adding 8 and 8 we get 16.
6 = 3 + 3
By adding 3 and 3 we get 6.
18 = 9 + 9
By adding 9 and 9 we get 18.
5 + 5= 10
By adding 5 and 5 we get 10.
6+ 6 = 12
By adding 6 and 6 we get 12.
8 = 4+ 4
By adding 4 and 4 we get 8.
7 + 7 = 14
By adding 7 and 7 we get 14.

Question 3.
Fill in the missing numbers to complete the subtraction facts.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 20
Answer:
Bridges-in-Mathematics-Grade-3-Student-Book-Unit-2-Module-1-Answer-Key-20
Explanation:
By subtracting 8 from 15 we get 7. So, the missing number is 7.
By subtracting 3 from 13 we get 10. So, the missing number is 10.
By subtracting 9 from 18 we get 9. So, the missing number is 9.
By subtracting 7 from 11 we get 4. So, the missing number is 7.
By subtracting 9 from 16 we get 7. So, the missing number is 7.
By subtracting 3 from 11 we get 8. So, the missing number is 11.
By subtracting 9 from 17 we get 8. So, the missing number is 8.
By subtracting 9 from 12 we get 3. So, the missing number is 9.
By subtracting 2 from 11 we get 9. So, the missing number is 9.
By subtracting 3 from 12 we get 9. So, the missing number is 3.
By subtracting 2 from 14 we get 12. So, the missing number is 12.
By subtracting 5 from 13 we get 8. So, the missing number is 5.

Question 4.
CHALLENGE What is one way the equations in problem 2 are alike?
Answer: Repeated addition is to add equal groups or the same number over and over.

Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Session 3 Answer Key

More Groups of Stamps

For the following questions:

  • Write the total cost for each group of stamps.
  • Show how you found the total cost. Use numbers, sketches, or words to show your thinking.

Question 1.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 1
Cost of Stamps
Your Work
Answer:
4 × 5 = 20
4 × 5 = 20
20 + 20 = 40
(or)
We can use repeated addition,
4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 40

Question 2.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 2
Cost of Stamps
Your Work
Answer:
There are eight 5’s in the above figure.
8 × 5 = 40
4 × 5 = 20¢
4 × 5 = 20¢
20¢ + 20¢ = 40¢
5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = 40¢

Question 3.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 3
Cost of Stamps
Your Work
Answer:
There are 16 2¢ stamps in the above figure.
8 × 2¢ = 16¢
8 × 2¢ = 16¢
16¢ + 16¢ = 32¢
Thus the cost of stamps is 32¢

Question 4.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 4
Cost of Stamps
Your Work
Answer:
There are 8 4¢ stamps in the above figure.
4 × 4¢ = 16¢
4 × 4¢ = 16¢
16¢ + 16¢ = 32
Thus the cost of stamps is 32¢

Question 5.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 5
Cost of Stamps
Your Work
Answer:
There are 8 7¢ stamps in the above figure.
4 × 7¢ = 28¢
4 × 7¢ = 28¢
28¢ + 28¢ = 56¢
Thus the cost of stamps is 56¢

Question 6.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 6
Cost of Stamps
Your Work
Answer:
There are 6 9¢’s in the above figure.
2 × 9¢ = 18¢
2 × 9¢ = 18¢
2 × 9¢ = 18¢
18¢ + 18¢ + 18¢ = 54¢
Thus the Cost of Stamps is 54¢

Question 7.
CHALLENGE
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 7
Cost of Stamps
Your Work
Answer:
There are 16 11¢ in the above figure.
4 × 11¢ = 44¢
4 × 11¢ = 44¢
4 × 11¢ = 44¢
4 × 11¢ = 44¢
44¢ + 44¢ + 44¢ + 44¢ = 176¢
Thus the Cost of Stamps is 17¢

Question 8.
CHALLENGE
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 8
Cost of Stamps
Your Work
Answer:
There are 12 9¢ stamps in the above figure.
3 × 9¢ = 27¢
3 × 9¢ = 27¢
3 × 9¢ = 27¢
3 × 9¢ = 27¢
27¢ + 27¢ + 27¢ + 27¢ = 108¢

Alexandra’s Garden

For each story problem, show your thinking using numbers, sketches, or words.

Question 1.
Alexandra has a garden. In her garden, she has 6 daisy plants. Each plant has 3 flowers. How many daisy flowers does Alexandra have?
Answer:
Given,
Alexandra has a garden. In her garden, she has 6 daisy plants. Each plant has 3 flowers.
6 × 3 = 18
Thus Alexandra has 18 daisy flowers.

Question 2.
Alexandra also has 5 strawberry plants. Each plant has 6 strawberries on it. How many strawberries does Alexandra have?
Answer:
Given,
Alexandra also has 5 strawberry plants. Each plant has 6 strawberries on it.
5 × 6 = 30 strawberries
Thus Alexandra has 30 strawberries.

Question 3.
Alexandra catches ladybugs for her garden because they will eat aphids that eat her plants. Alexandra has a pepper plant with 4 peppers on it. Each pepper has 4 ladybugs on it. How many ladybugs are on the pepper plant?
Answer:
Given,
Alexandra catches ladybugs for her garden because they will eat aphids that eat her plants.
Alexandra has a pepper plant with 4 peppers on it.
Each pepper has 4 ladybugs on it.
4 × 4 = 16 ladybugs
Thus there 16 ladybugs on the pepper plant.

Question 4.
Solve the following problems:
7 + 7 + 7 + 7 = ____ 6 + 6 + 6 = ____ 9 + 9 + 9 + 9 + 9 = _____
Answer:
We can find the sum by using the repeated addition concept.
7 + 7 + 7 + 7 = 28
6 + 6 + 6 = 18
9 + 9 + 9 + 9 + 9 = 45

Question 5.
CHALLENGE Write a multiplication equation to represent one of the problems above.
Answer:
7 + 7 + 7 + 7  can be written in the multiplication form as 7 × 4 = 28
Multiplication Equation: 7 × 4 = 28.

Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Session 4 Answer Key

Fruit & Stamps

Question 1.
Complete the following problems. Show your work using pictures, numbers, or words.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 9
Answer:
Bridges-in-Mathematics-Grade-3-Student-Book-Unit-2-Module-1-Answer-Key-9

Question 2.
How many apples are in the box? How do you know?
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 10
Answer:
From the figure we can observe that there are 3 apples in each row.
Number of rows = 3
3 × 3 = 9
We can use repeated addition
3 + 3 + 3 = 9 apples
Thus there are 9 apples in the box.

Question 3.
How many lemons are in the box? How do you know?
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 11
Answer:
From the figure, we can observe that there are 4 lemons in each row.
4 × 5 = 20 lemons
We can use repeated addition
4 + 4 + 4 + 4 + 4 = 20 lemons
Thus there are 20 lemons in the box.

Question 4.
How many oranges are in the boxes below? How do you know?
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 12
Answer:
From the figure, we can observe that there are 3 oranges in each row.
3 × 2 = 6 oranges
6 + 6 = 12 oranges
Thus there are 12 oranges in the boxes.

Question 5.
In the set of stamps below, each stamp costs the same. Decide how much the stamps should cost. Then, find out how much the entire set of stamps cost. Show your work.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 13
Answer:
From the figure, we can observe that there are 3 stamps in each row.
3 × 3 = 9
stamps in all.

Question 6.
CHALLENGE Now make up your own set of stamps. Decide how many stamps you want, how they should be arranged, and how much they cost in all. Show your work.
Answer:
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 6
There are 6 9¢’s in the above figure.
2 × 9¢ = 18¢
2 × 9¢ = 18¢
2 × 9¢ = 18¢
18¢ + 18¢ + 18¢ = 54¢
Thus the Cost of Stamps is 54¢

Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Session 5 Answer Key

Work Place Instructions 2A Loops & Groups

Each pair of players needs:

  • two 2A Loops & Groups Record Sheets
  • a die numbered 1-6

1. One player rolls the die and draws that number of loops. The player rolls a second time to see how many shapes to draw in each loop. The player records the multiplication equation that is represented by the picture.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 14
2. The other player repeats these actions.
3. The game continues for a total of 5 rounds.
4. At the end of the game, each player finds the sum of their 5 products.
5. Players share their sums and addition strategies with each other. The player with the highest total wins.

Game Variations

A. Players can make a list of numbers from 1 to 36. As they play, players make a tally mark next to each product they get. Players make observations about which products occur the most and least often. Will they be able to put a tally mark next to every number?
B. Players use a die numbered 4-9. How does the game change with a different die?

Seascape A: How Long? How Tall?

Chloe the Clownfish is 4 inches long in real life. Use this information to figure out how long, wide or tall some of the other species in Seascape A are.

  • Work with a partner.
  • Use any materials available to you.
  • Show your work in the space provided. Use pictures, numbers, or words to explain your thinking.

Question 1.
The sea anemone is ____ wide.
Answer:

Question 2.
The parrotfish is ___ long.
Answer:

Question 3.
The triggerfish is ____ long.
Answer:

Question 4.
The sea turtle is ____ long.
Answer:

Question 5.
The basket sea star is _________ wide.
Answer:

Question 6.
The vase sponge is ____ wide.
Answer:

Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 15

Seascape B: How Long? How Tall?

Chloe the Clownfish is 4 inches long in real life. Use this information to figure out how long, wide or tall some of the other species in Seascape A are.

  • Work with a partner.
  • Use any materials available to you.
  • Show your work in the space provided. Use your thinking.

Question 1.
The brain coral is ____ wide.
Answer:

Question 2.
The sand tiger shark is ____ long.
Answer:

Question 3.
Tube sponge A is tall.
Answer:

Question 4.
Tube sponge B is ____ tall.
Answer:

Question 5.
The moray eel is ____ long.
Answer:

Question 6.
Find the length, width, or height of one other living thing in this seascape.
Answer:

Question 7.
CHALLENGE The shorter sea grass is ____ tall.
Answer:

Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 16

Coral Reef Challenges

Complete the following problems. Show your work using numbers, sketches or words.

Question 1.
Chloe the Clownfish is 4 inches long. She swims past a sea anemone that is 3 times as wide as she is long. How wide is the sea anemone?
Answer:
Given,
Chloe the Clownfish is 4 inches long.
She swims past a sea anemone that is 3 times as wide as she is long.
4 × 3 = 12 inches wide.

Question 2.
Now Chloe swims past a sea turtle that is 3 times as long as the sea anemone is wide. How long is the sea turtle? (You will need to use your answer from problem 1 to answer this question.)
Answer:
Chloe swims past a sea turtle that is 3 times as long as the sea anemone is wide.
12 × 3 = 36 inches.

Question 3.
How much does this set of stamps cost?
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 17
Answer:
5 + 5 + 5 = 15
There area 4 rows.
15 × 4 = 60¢

Question 4.
For the set of stamps below, decide how much the stamps should cost. Each stamp costs the same. Then, find out how much the entire set of stamps cost. Show your work.
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 18
Answer:

Question 5.
Solve the following equations:
4 + ___ = 14 ____ = 8 + 7 13 = ___ + 8
17 – ___ = 7 4 = 13 – ____ ____ = 19 – 6
Answer:
4 + 10 = 14
15 = 8 + 7
13 = 5 + 8
17 – 10 = 7
4 = 13 – 9
13 = 19 – 6

Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Session 6 Answer Key

Complete the following problems. Show your work using numbers, sketches, or words.

Question 1.
Mrs. Biddle made some cupcakes for her 3 children. She made 2 cupcakes for each child. How many cupcakes did Mrs. Biddle make?
Answer:
Given,
Mrs. Biddle made some cupcakes for her 3 children.
She made 2 cupcakes for each child.
3 × 2 = 6 cupcakes
Thus Mrs. Biddle make 6 cupcakes.

Question 2.
Then Mrs. Biddle’s 3 children all wanted to bring cupcakes to their friends. Mrs. Biddle made 12 more cupcakes. If each child got the same amount of cupcakes, how many cupcakes could each child share?
Answer:
Mrs. Biddle make 6 cupcakes.
Mrs. Biddle’s 3 children all wanted to bring cupcakes to their friends.
Mrs. Biddle made 12 more cupcakes.
6 + 12 = 18
18/3 = 6 cupcakes
Thus each child share 6 cupcakes.

Question 3.
Next, Mrs. Biddle’s 3 children wanted to bring cupcakes to their classes at school. If each child had 20 students in their class, how many cupcakes does Mrs. Biddle need to make?
Answer:
Given,
Mrs. Biddle’s 3 children wanted to bring cupcakes to their classes at school.
each child had 20 students in their class
20 × 3 = 60 cupcakes

Question 4.
One large tray of cupcakes has 4 times as many cupcakes as another tray, which has 20 cupcakes on it. Which equation describes this situation?
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 19 20 – 4 = c
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 19 4 × c = 20
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 19 c + 4 = 20
Bridges in Mathematics Grade 3 Student Book Unit 2 Module 1 Answer Key 19 20 × 4 = c
Answer:
Given,
One large tray of cupcakes has 4 times as many cupcakes as another tray, which has 20 cupcakes on it.
4 × 20 = c
c = 80
Thus option D is the correct answer.

Question 5.
Mrs. Biddle’s daughter, Flora, brought a tray of cupcakes to school. The tray had a 4-by-6 array of cupcakes. On the way to school, Flora tripped, and 4 cupcakes fell into a mud puddle. The rest of the cupcakes stayed on the tray. How many cupcakes are still on the tray?
Answer:
Given,
Mrs. Biddle’s daughter, Flora, brought a tray of cupcakes to school. The tray had a 4-by-6 array of cupcakes.
4 × 6 = 24 cupcakes
On the way to school, Flora tripped, and 4 cupcakes fell into a mud puddle.
24 – 4 = 20 cupcakes
Thus there are 20 cupcakes on the tray.

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