# McGraw Hill My Math Grade 1 Chapter 4 Lesson 6 Answer Key Use Related Facts to Add and Subtract

All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 4 Lesson 6 Use Related Facts to Add and Subtract will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Answer Key Chapter 4 Lesson 6 Use Related Facts to Add and Subtract

Explore and Explain Teacher Directions: Use to model. There are 6 players on one side of the net and 8 players on the other side. How many people are playing volleyball in all? Write the addition number sentence. Then write a related subtraction fact. Explanation:
There are 6 players on one side of the net and 8 players on the other side
6 + 8 = 14
So, 14 people are playing football in all
The addition number sentence is 6 + 8 = 14
The related subtraction sentence is 14 – 8 = 6.

See and Show

Related facts use the same numbers.
Find 11 – 5. Use 6 + 5 = 11 to find 11 – 5 = 6

Use related facts to add and subtract.

Question 1.
7 + 9 = ___
16 – 7 = ____
7 + 9 = 16
16 – 7 = 9

Explanation:
Related facts use the same numbers
7 + 9 = 16
Use related fact to solve
So, 16 – 7 = 9.

Question 2.
5 + 8 = ___
13 – 5 = ___
5 + 8 = 13
13 – 5 = 8

Explanation:
Related facts use the same numbers
5 + 8 = 13
Use related fact to solve
So, 13 – 5 = 8.

Question 3.  Explanation:
Related facts use the same numbers
5 + 7 = 12
Use related fact to solve
So, 12 – 5 = 7.

Question 4.  Explanation:
Related facts use the same numbers
8 + 7 = 15
Use related fact to solve
So, 15 – 7 = 8.

Talk Math
Are the facts 1 + 5 = 6 and 6 – 1 = 5 related facts? How do you know?
1 + 5 = 6 and 6 – 1 = 5 are related facts as they have same numbers.

On My Own Use related facts to add and subtract.

Question 5.
9 + 6 = ____
15 – 9 = ____
9 + 6 = 15
15 – 9 = 6

Explanation:
Related facts use the same numbers
9 + 6 = 15
Use related fact to solve
So, 15 – 9 = 6.

Question 6.
6 + 7 = ___
13 – 6 = ___
6 + 7 = 13
13 – 6 = 7

Explanation:
Related facts use the same numbers
6 + 7 = 13
Use related fact to solve
So,13 – 6 = 7.

Question 7.
3 + 9 = ____
12 – 3 = ____
3 + 9 = 12
12 – 3 = 9

Explanation:
Related facts use the same numbers
3 + 9 = 12
Use related fact to solve
So, 12 – 3 = 9.

Question 8.
8 + 9 = ___
17 – 8 = ____
8 + 9 = 17
17 – 8 = 9

Explanation:
Related facts use the same numbers
8 + 9 = 17
Use related fact to solve
So, 17 – 8 = 9.

Question 19.  Explanation:
Related facts use the same numbers
7 + 9 = 16
Use related fact to solve
So, 14 – 6 = 8.

Question 20.  Explanation:
Related facts use the same numbers
8 + 4 = 12
Use related fact to solve
So, 12 – 4 = 8.

Question 11.
16 – 9 = ____
____ + ____ = ____
16 – 9 = 7
9 + 7 = 16

Explanation:
Related facts use the same numbers
16 – 9 = 7
Use related fact to solve
So, 9 + 7 = 16.

Question 12.
12 – 7 = ____
____ + ____ = ____
12 – 7 = 5
7 + 5 = 12

Explanation:
Related facts use the same numbers
12 – 7 = 5
Use related fact to solve
So, 7 + 5 = 12.

Question 13.
14 – 9 = ____
____ + ____ = ____
14 – 9 = 5
9 + 5 = 14

Explanation:
Related facts use the same numbers
14 – 9 = 5
Use related fact to solve
So, 9 + 5 = 14.

Question 14.
11 – 4 = ____
____ + ____ = ____
11 – 4 = 7
4 + 7 = 11

Explanation:
Related facts use the same numbers
11 – 4 = 7
Use related fact to solve
So, 4 + 7 = 11.

Problem Solving

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

Question 15.
Bailey sees 15 birds sitting on a rock. 7 of the birds fly away. How many of the birds are still on the rock?
____ – ____ = ____ ____ + ____ = ____
15 – 7 = 8
8 + 7 = 15

Explanation:
Bailey sees 15 birds sitting on a rock
7 of the birds fly away
Related facts use the same numbers
15 – 7 = 8
Use related fact to solve
So, 8 + 7 = 15
Therefore, 8 birds are still on the rock.

Question 16.
Andre collects 10 shells. He loses 6 of them. How many shells does Andre have left?
____ – ____ = ____ ____ + ____ = ____
10 – 6 = 4
6 + 4 = 10

Explanation:
Andre collects 10 shells
He loses 6 of them
Related facts use the same numbers
10 – 6 = 4
Use related fact to solve
So, 6 + 4 = 10
Therefore, Andre have left with 4 shells.

_____________________________
_____________________________
_____________________________
_____________________________
Related facts an addition fact and subtraction fact that uses the same numbers addition something added to what you already have subtraction act of taking something away fact family a set of related addition/subtraction or multiplication/division equations that use the same numbers.

### McGraw Hill My Math Grade 1 Chapter 4 Lesson 6 My Homework Answer Key

Practice

Use related facts to add and subtract.

Question 1.
5 + 9 = ____
14 – 5 = ____
5 + 9 = 14
14 – 5 = 9

Explanation:
Related facts use the same numbers
5 + 9 = 14
Use related fact to solve
So, 14 – 5 = 9.

Question 2.
9 + 5 = ___
14 – 9 = ___
9 + 5 = 14
14 – 9 = 5

Explanation:
Related facts use the same numbers
9 + 5 = 14
Use related fact to solve
So, 14 – 9 = 5.

Question 3.
6 + 5 = ____
11 – 6 = ___
6 + 5 = 11
11 – 6 = 5

Explanation:
Related facts use the same numbers
6 + 5 = 11
Use related fact to solve
So, 11 – 6 = 5.

Question 4.
9 + 9 = ___
18 – 9 = ___
9 + 9 = 18
18 – 9 = 9

Explanation:
Related facts use the same numbers
9 + 9 = 18
Use related fact to solve
So, 18 – 9 = 9.

Question 5.  Explanation:
Related facts use the same numbers
8 + 8 = 16
Use related fact to solve
So, 16 – 8 = 8.

Question 6.  Explanation:
Related facts use the same numbers
8 + 3 = 13
Use related fact to solve
So, 13 – 8 = 5.

Question 7.
15 – 8 = ___
____ + ____ = ____
15 – 8 = 7
8 + 7 = 15

Explanation:
Related facts use the same numbers
15 – 8 = 7
Use related fact to solve
So, 8 + 7 = 15.

Question 8.
17 – 9 = ____
____ + ____ = ____
17 – 9 = 8
9 + 8 = 17

Explanation:
Related facts use the same numbers
17 – 9 = 8
Use related fact to solve
So, 9 + 8 = 17.

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

Question 9.
There are 16 lobsters swimming together. 7 of them swim away.
How many lobsters are still swimming together? ____ – ____ = ____
____ + ____ = ____
16 – 7 = 9
7 + 9 = 16

Explanation:
There are 16 lobsters swimming together
7 of them swim away
Related facts use the same numbers
16 – 7 = 9
Use related fact to solve
So, 7 + 9 = 16
Therefore, 9 lobsters are still swimming together.

Test Practice

Question 10.
7 – 3 = 4
(A) 7 + 3 = 10
(B) 7 – 4 = 3
(C) 7 + 1 = 8
(D) 3 + 4 = 7