# McGraw Hill My Math Grade 1 Chapter 2 Lesson 13 Answer Key Relate Addition and Subtraction

All the solutions provided inÂ McGraw Hill My Math Grade 1 Answer Key PDF Chapter 2 Lesson 13 Relate Addition and Subtraction will give you a clear idea of the concepts.

Explore and Explain

Explanation:
There are 3 birds in the bird bath
2 more birds join them
The addition fact to solve the problem is 3 + 2 = 5
The related subtraction fact is 5 – 3 = 2
So, there are 5 birds in all.

Teacher Directions: Use to model. There are 3 birds in the bird bath. 2 more birds join them. Write the addition number sentence to show how many birds there are in all. Write a related subtraction number sentence.

See and Show

5 + 2 = 7
7 – 5 = 2
7 – 2 = 5

5 + 2 = 7.
Use that fact to find
7 – 2 = 5.
You can use 5 + 2 = 7
to find 72 = 5
They are opposite or inverse operations.

Identify an addition fact. Use Work Mat 3 and to find a related subtraction fact. Write both facts.

Question 1.

____ + ____ = _____
____ – ____ = _____
3 + 6 = 9
9 – 3 = 6

Explanation:
The addition fact for the given picture is 3 + 6 = 9
The related subtraction fact is 9 – 3 = 6.

Question 2.

____ + ____ = _____
____ – ____ = _____
2 + 4 = 6
6 – 2 = 4

Explanation:
The addition fact for the given picture is 2 + 4 = 6
The related subtraction fact is 6 – 2 = 4.

We can use addition fact to subtract by subtracting one of the addend from the sum.

On My Own

Use Work Mat 3 and to find the related subtraction facts. Write the facts.

Question 3.
5 + 4 = 9
____ – ____ = ____
____ – ____ = ____
9 – 4 = 5
9 – 5 = 4

Explanation:
The related subtraction facts for the given addition facts are 9 – 4 = 5 and 9 – 5 = 4.

Question 4.
8 + 1 = 9
____ – ____ = ____
____ – ____ = ____
9 – 1 = 8
9 – 8 = 1

Explanation:
The related subtraction facts for the given addition facts are 9 – 1 = 8 and 9 – 8 = 1.

Question 5.
1 + 4 = 5
____ – ____ = ____
____ – ____ = ____
5 – 1 = 4
5 – 4 = 1

Explanation:
The related subtraction facts for the given addition facts are 5 – 1 = 4 and 5 – 4 = 1.

Question 6.
3 + 4 = 7
____ – ____ = ____
____ – ____ = ____
7 – 3 = 4
7 – 4 = 3

Explanation:
The related subtraction facts for the given addition facts are 7 – 3 = 4 and 7 – 4 = 3.

Question 7.
5 + 3 = 8
____ – ____ = ____
____ – ____ = ____
8 – 5 = 3
8 – 3 = 5

Explanation:
The related subtraction facts for the given addition facts are 8 – 5 = 3 and 8 – 3 = 5.

Question 8.
2 + 3 = 5
____ – ____ = ____
____ – ____ = ____
5 – 2 = 3
5 – 3 = 2

Explanation:
The related subtraction facts for the given addition facts are 5 – 2 = 3 and 5 – 3 = 2.

Problem Solving

Write a subtraction number sentence. Then write a related addition fact.

Question 9.
There are 8 lizards. 6 of the lizards run away. How many lizards are left?

____ – ____ = ____ lizards
____ + ____ = ____
8 – 6 = 2 lizards
6 + 2 = 8

Explanation:
There are 8 lizards
6 of the lizards run away
The subtraction fact to solve the problem is 8 – 6 = 2
The addition fact for the problem is 6 + 2 = 8
So, 2 lizards are left.

Question 10.
Chad saw 7 birds. Audrey saw 4 birds. How many more birds did Chad see?
____ – ____ = ____ birds
____ + ____ = ____
7 – 4 = 3 birds
4 + 3 = 7

Explanation:
Audrey saw 4 birds
The subtraction fact to solve the problem is 7 – 4 = 3
The addition fact for the problem is 4 + 3 = 7
So, Chad see 3 more birds.

Write Math 5 + 4 = 9 and 9 – 3 = 6. Are these related facts? Explain why or why not.
______________________
______________________
______________________
______________________
5 + 4 = 9 and 9 – 3 = 6
No, these are not related facts
In related facts the facts will have same numbers.

### McGraw Hill My Math Grade 1 Chapter 2 Lesson 13 My Homework Answer Key

Practice

Question 1.

____ + ____ = _____
____ – ____ = _____
4 + 3 = 7
7 – 4 = 3

Explanation:
The addition fact for the given picture is 4 + 3 = 7
The related subtraction fact is 7 – 4 = 3.

Question 2.

____ + ____ = _____
____ – ____ = _____
3 + 5 = 8
8 – 3 = 5

Explanation:
The addition fact for the given picture is 3 + 5 = 8
The related subtraction fact is 8 – 3 = 5.

Find the related subtraction facts. Write the facts.

Question 3.
4 + 2 = 6
____ – ____ = _____
____ – ____ = _____
6 – 2 = 4
6 – 4 = 2

Explanation:
The related subtraction facts for the given addition facts are 6 – 2 = 4 and 6 – 4 = 2.

Question 4.
1 + 8 = 9
____ – ____ = _____
____ – ____ = _____
9 – 1 = 8
9 – 8 = 1

Explanation:
The related subtraction facts for the given addition facts are 9 – 1 = 8 and 9 – 8 = 1.

Write the subtraction number sentence. Then write the related addition fact.

Question 5.
There are 6 flowers in a vase. Mom gives 2 of the flowers to a friend. How many flowers are in the vase now?

____ – ____ = ____
____ + ____ = ____
6 – 2 = 4
4 + 2 = 6

Explanation:
There are 6 flowers in a vase
Mom gives 2 of the flowers to a friend
6 – 2 = 4
The subtraction fact to solve the problem is 6 – 2 = 4
The addition fact for the problem is 4 + 2 = 6.

Vocabulary Check

subtractÂ  Â  Â  Â  Â related facts

Question 6.
3 + 1 = 4 and 4 – 1 = 3 are ______