# McGraw Hill My Math Grade 2 Chapter 1 Lesson 9 Answer Key Use Doubles to Subtract

All the solutions provided in McGraw Hill Math Grade 2 Answer Key PDF Chapter 1 Lesson 9 Use Doubles to Subtract will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 2 Answer Key Chapter 1 Lesson 9 Use Doubles to Subtract

Explore and Explain

Teacher Directions: Place a 6 cube train at the top of the page. Trace it. Separate the train into two equal parts. Draw the parts below the 6 cube train. Write how many cubes are in each part.
Explanation:

See and Show

Find 16-8.

Use cubes and doubles facts to subtract.

Question 1.

9 + ____ = 18
18 – 9 = ____
9 + 9 = 18
18 – 9 = 9
Explanation:
Two addends that are the same are called doubles.
Double Facts are additions in which a number is added to itself.
The difference of 18 and 9 is 9

Question 2.

5 + ____ = 10
10 – 5 = ____
5 + 5 = 10
10 – 5 = 5
Explanation:
Two addends that are the same are called doubles.
Double Facts are additions in which a number is added to itself.
The difference of 10 and 5 is 5

Question 3.
6 + ___ = 12
12 – 6 = ___
6 + 6 = 12
12 – 6 = 6
Explanation:
Two addends that are the same are called doubles.
Double Facts are additions in which a number is added to itself.
The difference of 12 and 6 is 6

Question 4.
4 + ____ = 8
8 – 4 = ____
4 + 4 = 8
8 – 4 = 4
Explanation:
Two addends that are the same are called doubles.
Double Facts are additions in which a number is added to itself.
The difference of 8 and 4 is 4

Question 5.
7 + ___ = 14
14 – 7 = ___
7 + 7 = 14
14 – 7 = 7
Explanation:
Two addends that are the same are called doubles.
Double Facts are additions in which a number is added to itself.
The difference of 14 and 7 is 7

Question 6.
8 + ____ = 16
16 – 8 = ____
8 + 8 = 16
16 – 8 = 8
Explanation:
Two addends that are the same are called doubles.
Double Facts are additions in which a number is added to itself.
The difference of 16 and 8 is 8

Talk Math Explain how you can use a doubles fact to subtract.

I know 5 + 5 = 10, so 10 – 5 = 5.

On My Own

Subtract. Circle the doubles facts.

Question 7.
9 – 3 = ___
6
Explanation:
The difference of 9 and 3 is 6
9 – 3 = 6

Question 8.
11 – 9 = ____
2
Explanation:
The difference of 11 and 2 is 9
11 – 9 = 2

Question 9.
6 – ___ = 3
6 – 3 = 3
3 + 3 = 6
Explanation:
The difference of 6 and 3 is 3

Question 10.
7 – 3 = ____
4
Explanation:
The difference of 7 and 3 is 4
7 – 3 = 4

Question 11.
18 – 9 = ___
9
Explanation:
The difference of 18 and 9 is 9
18 – 9 = 9

Question 12.
15 – 7 = ____
8
Explanation:
The difference of 15 and 7 is 8
15 – 7 = 8

Question 13.

Explanation:
The difference of 16 and 8 is 8
16 – 8 = 8

Question 14.

Explanation:
The difference of 7 and 0 is 7
7 – 0 = 7

Question 15.

Explanation:
The difference of 10 and 5 is 5
10 – 5 = 5

Question 16.

Explanation:
The difference of 9 and 8 is 1
9 – 8 = 1

Question 17.

Explanation:
The difference of 6 and 2 is 4
6 – 2 = 4

Question 18.

Explanation:
The difference of 8 and 3 is 5
8 – 3 = 5

Question 19.

Explanation:
The difference of 14 and 7 is 7
14 – 7 = 7

Question 20.

Explanation:
The difference of 7 and 6 is 1
7 – 6 = 1

Question 21.

Explanation:
The difference of 8 and 4 is 4
8 – 4 = 4

Problem Solving

Question 22.
Fran and her grandmother pick 16 pumpkins. They use 8 pumpkins for pie. How many pumpkins are left?

____ pumpkins
8 pumpkins
Explanation:
Fran and her grandmother pick 16 pumpkins.
They use 8 pumpkins for pie.
16 – 8 = 8
8 pumpkins are left.

Question 23.
Delia bakes 18 cherry pies. She sells 9 pies at a farmers’ market. How many pies does Delia have left?
____ pies
9 pies.
Explanation:
Delia bakes 18 cherry pies.
She sells 9 pies at a farmers’ market.
18 – 9 = 9
9 pies that Delia have left.

Question 24.
14 children were playing hide and go seek. 7 children were found. How many children are still hiding?
____ children
7 children.
Explanation:
14 children were playing hide and go seek.
7 children were found.
14 – 7 = 7
7 children are still hiding.

Write Math Explain how you can use doubles facts to help you subtract.

### McGraw Hill My Math Grade 2 Chapter 1 Lesson 9 My Homework Answer Key

Practice

Subtract. Circle the doubles facts.

Question 1.
18 – 9 = ____
9
Explanation:
The difference of 18 and 9 is 9
18 – 9 = 9

Question 2.
6 – 2 = ____
4
Explanation:
The difference of 6 and 2 is 4
6 – 2 = 4

Question 3.
8 – 2 = ___
6
Explanation:
The difference of 8 and 2 is 6
8 – 2 = 6

Question 4.
5 – 3 = ____
2
Explanation:
The difference of 5 and 3 is 2
5 – 3 = 2

Question 5.
16 – 8 = ___
8
Explanation:
The difference of 16 and 8 is 8
16 – 8 = 8

Question 6.
8 – 3 = ___
5
Explanation:
The difference of 8 and 3 is 5
8 – 3 = 5

Question 7.
6 – 3 = ___
3
Explanation:
The difference of 6 and 3 is 3
6 – 3 = 3

Question 8.
8 – 8 = ___
0
Explanation:
The difference of 8 and 8 is 0
8 – 8 = 0

Question 9.

Explanation:
The difference of 14 and 7 is 7
14 – 7 = 7

Question 10.

Explanation:
The difference of 9 and 1 is 8
9 – 1 = 8

Question 11.

Explanation:
The difference of 10 and 4 is 6
10 – 4 = 6

Subtract. Circle the doubles facts.

Question 12.
14 – 6 = ____
8
Explanation:
The difference of 14 and 6
14 – 6 = 8

Question 13.
18 – 8 = ____
10
Explanation:
The difference of 18 and 8 is 10
18 – 8 = 10

Question 14.
18 – 9 = ___
9
Explanation:
The difference of 18 and 9 is 9
18 – 9 = 9

Question 15.
15 – 7 = ___
8
Explanation:
The difference of 15 and 7 is 8
15 – 7 = 8

Question 16.
Anita checks out 14 library books. She reads 7 of the books. How many books does she still have to read?

____ books
7 books
Explanation:
Anita checks out 14 library books.
She reads 7 of the books.
14 – 7 = 7
7 books that she still have to read.

Question 17.
Lindsay has 16 cupcakes to hand out. She has given 8 to the girls in her class. How many does she have left?
___ cupcakes
8 cup cakes.
Explanation:
Lindsay has 16 cupcakes to hand out.
She has given 8 to the girls in her class.
16 – 8 = 8
she have left 8 .

Test Practice

Question 18.
Mark the number sentence that uses doubles.
(A) 4 – 4 = 0
(B) 8 – 4 = 4
(C) 8 – 3 = 5
(D) 8 – 8 = 0