We included HMH Into Math Grade 1 Answer Key PDF Module 4 Lesson 1 Think Addition to Subtract to make students experts in learning maths.

I Can use addition to help solve a subtraction problem.

Jamel has 13 pears. 8 are yellow. The rest are green. How can you use addition to find how many green pears he has?

Explanation:
Jamel has 13 pears. 8 are yellow
The rest are green
Start at 8. Count on till 13
8, 9 , 10, 11, 12, 13
I counted 5 more numbers
8 + 5 = 13
So, 13 – 8 = 5
Therefore, Jamel has 5 green apples.

Read the problem aloud. Have pairs of children work together to show how to solve the problem.

Build Understanding

There are 9 frogs at the pond. 4 of the frogs swim. The rest sit on a log. How many frogs sit on the log?
9 – 4 =

A. How can you show the problem as addition?

___ + __ = ___
so, 9 – 4 = __
C. ___ frogs sit on the log.

Explanation:
There are 9 frogs at the pond
4 of the frogs swim
The rest sit on a log
Start at 4. Count on till 9
4, 5, 6, 7, 8, 9
I counted 5 more
4 + 5 = 9
So, 9 – 4 = 5
Therefore, 5 frogs sit on the log.

Turn and Talk What do you notice about the addition and subtraction equations you used to solve the problem?
The addition and subtraction equations that i used to solve the problem has same numbers with different operations.

Step It Out

1. 7 girls play basketball. 3 of them wear green. The rest wear blue. How many girls wear blue?

A. There are 7 girls altogether.
THINK: The number I subtract from is ___
B. 3 of the girls wear green.
THINK: The number I subtract is ___
THINK: What number added to 3 makes 7?
3 + ___ = 7

D. So, 7 – 3 = _____ .

E. ___ girls wear blue.
4 girls wear blue.

Explanation:
3 of them wear green
Subtract 3 from 7
Start at 3. Count on till 7
3, 4, 5, 6, 7
I counted 4 more
3 + 4 = 7
So, 7 – 3 = 4
Therefore, 4 girls wear blue.

Turn and Talk What do you notice about the number 7 in the addition equation and the subtraction equation?
In addition equation the number 7 is the sum of two numbers
In Subtraction equation the number 7 is the number from which we subtract other number to find the difference.

Step It Out

2. There are 13 birds in a tree. 9 are red. The rest are blue. How many blue birds are in the tree?
Use addition to solve 13 – 9 = .

A. Use the numbers from the subtraction equation to write an addition equation.
9 + = 13
What number added to 9 makes 13? ____
9 + __ = 13
So, 13 – 9 = ___

B. ___ blue birds are in the tree.
4 blue birds are in the tree

Explanation:
There are 13 birds in a tree. 9 are red. The rest are blue
Use the numbers from the subtraction equation to write an addition equation.
9 + = 13
Start at 9. Count on till 13
I counted 4 more
9 + 4 = 13
So, 13 – 9 =
Therefore, there are 4 blue birds in the tree.

Check Understanding Math Board

Question 1.
Anthony picks 11 flowers. 8 of them are red. The rest are pink. How many pink flowers does he pick?
____ +____ = ___
11 – 8 = ___ ____ pink flowers
11 – 8 = 3
3 pink flowers

Explanation:
Anthony picks 11 flowers. 8 of them are red. The rest are pink
11 – 8 =
Start at 8. Count on till 11
8, 9, 10, 11
I counted 3 more
8 + 3 = 11
So, 11 – 8 = 3
Therefore, Anthony picks 3 pink flowers.

Question 2.
Cristian has 14 marbles. 6 are purple. The rest are green. How many green marbles does Cristian have?

___ + ___ = ____
14 – 6 = ___
___ green marbles
6 + 8 = 14
14 – 6 = 8
8 green marbles

Explanation:
Cristian has 14 marbles. 6 are purple. The rest are green
14 – 6 =
Start at 6. Count on till14
6, 7, 8, 9, 10, 11, 12, 13, 14
I counted 8 more
6 + 8 = 14
So, 14 – 6 = 8
Therefore, Cristian has 8 green marbles.

Question 3.
There are 8 bugs. 3 are on a leaf. The rest of them are on a stick. How many bugs are on a stick?
___ + ___ = ___
8 – 3 = ___
___ bugs
3 + 5 = 8
8 – 3 = 5
5 bugs

Explanation:
There are 8 bugs. 3 are on a leaf
The rest of them are on a stick
8 – 3 =
Start at 3. Count on till 8
3, 4, 5, 6, 7, 8
I counted 5 more
3 + 5 = 8
So, 8 – 3 = 5
Therefore, there are 5 bugs on a stick.

Question 4.
There are 13 plants in the garden. 7 are short. The rest are tall. How many tall plants are in the garden?
___ + ___ = ____
13 – 7 = ___
___ tall plants
7 + 6 = 13
13 – 7 = 6
6 tall plants

Explanation:
There are 13 plants in the garden. 7 are short. The rest are tall
13 – 7 =
Start at 7. Count on till 13
7, 8, 9, 10, 11, 12, 13
I counted 6 more
7 + 6 = 13
So, 13 – 7 = 6
Therefore, 6 trees are tall.

Question 5.
The addition equation that is related to 12 -7 is 5 + 7 = 12
So, if 5 + 7 = 12 then 12 – 7 = 5.

Question 6.
What is 11 – 2?
___ + ___ = ___
So, 11 – 2 = ___
2 + 9 = 11
So, 11 – 2 = 9

Explanation:
I used the addition equation 2 + 9 = 11 to find the difference of 11 and 2
The difference of 11 and 2 is 9.

Question 7.
What is 12 – 4?
___ + ___ = ___
So, 12 – 4 = ___
4 + 8 = 12
So, 12 – 4 = 8

Explanation:
I used the addition equation 4 + 8 = 12 to find the difference of 12 and 4
The difference of 12 and 4 is 8.

Question 8.
What is 16 – 7?
___ + ___ = ___
So, 16 – 7 = ___
7 + 9 = 16
So, 16 – 7 = 9

Explanation:
I used the addition equation 7 + 9 = 16 to find the difference of 16 and 7
The difference of 16 and 7 is 9.

Question 9.
What is 17 – 9?
___ + ___ = ___
So, 17 – 9 = ___