All the solutions provided in **McGraw Hill My Math Grade 1 Answer Key**** PDF** **Chapter 4 Review **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Chapter 4 Review Answer Key

**Circle the correct answer.**

Question 1.

count back

Answer:

Explanation:

I drew a circle around the first number line as it correctly shows the difference of 6 and 6.

Question 2.

fact family

7 + 3 = 10 3 + 7 = 10

3 + 7 = 10 4 + 6 = 10

10 – 7 = 3 5 + 5 = 10

10 – 3 = 7 8 + 2 = 10

Answer:

Explanation:

A fact family is a set of facts that have same numbers

I drew circle around the set of number sentences that are called fact family.

Question 3.

missing addend

8 + 3 = 11 8 + = 11

Answer:

Explanation:

I drew a circle around the number sentence that correctly shows the missing addend.

Question 4.

Answer:

Explanation:

I drew circle around the number sentence in which the arrow mark points towards difference of the numbers

5 is difference of 6 and 1.

**Concept Check**

**Count back to subtract.**

Question 5.

7 – 3 = ____

Answer:

4

Explanation:

7 – 3 =

Start at 7

Count back 3

6, 5, 4

So, 7 – 3 = 4.

Question 6.

9 – 2 = ____

Answer:

7

Explanation:

9 – 2 =

Start at 9

Count back 2

8, 7

So, 9 – 2 = 7.

**Use the number line to help you subtract.**

Question 7.

11 – 2 = ____

Answer:

Explanation:

11 – 2 =

Start at 11

Count back 2 by jumping back

I react at 9

So, 11 – 2 = 9.

Question 8.

10 – 1 = ____

Answer:

Explanation:

10 – 1 =

Start at 10

Count back 1 by jumping back

I react at 9

So, 10 – 1 = 9.

**Add the doubles facts. Then subtract.**

Question 9.

6 + 6 = ____

12 – 6 = ____

Answer:

6 + 6 = 12

12 – 6 = 6

Explanation:

6 + 6 = 12 is a doubles fact

So, 12 – 6 = 6

The related subtraction fact is 12 – 6 = 6.

Question 10.

8 + 8 = ____

16 – 8 = ____

Answer:

8 + 8 = 16

16 – 8 = 8

Explanation:

8 + 8 = 16 is a doubles fact

So, 16 – 8 = 8

The related subtraction fact is 16 – 8 = 8.

**Add and subtract. Complete the fact family.**

Question 11.

Answer:

Explanation:

I used the numbers 3, 5 and 8 to write the fact family

The sentences are 3 + 5 = 8, 5 + 3 = 8, 8 – 3 = 5 and 8 – 5 = 3.

**Find the missing addend.**

Question 12.

5 + = 12

12 – 5 =

Answer:

5 + = 12

12 – 5 =

Explanation:

I wrote the missing addend by subtracting

12 – 5 = 7

The missing addend is 7

So, 5 + 7 = 12.

Question 13.

9 + = 14

14 – 9 =

Answer:

9 + = 14

14 – 9 =

Explanation:

I wrote the missing addend by subtracting

14 – 9 = 5

The missing addend is 5

So, 9 + 5 = 14.

**Problem Solving**

Question 14.

Paige writes two related facts using these numbers. What related facts could she have written?

____ + ____ = ____

____ – ____ = ____

Answer:

8 + 4 = 12

12 – 8 = 4

Explanation:

Paige writes two related facts using these numbers

12, 8, 4

The related facts are 8 + 4 = 12, 4Â 8 = 12, 12 – 8 = 4 and 12 – 4 = 8

So, the two related facts that Paige writes are 8 + 4 = 12 and 12 – 8 = 4.

Question 15.

Jayson caught 15 fish. Ashlyn caught 7 fish. How many more fish Jayson catch than Ashlyn?

____ – ____ = ___ fish

Answer:

15 – 7 = 8

Explanation:

Jayson caught 15 fish

Ashlyn caught 7 fish

Subtract to find

15 – 7 =

Count back

Start at 15

Count back 7

14, 13, 12, 11, 10, 9, 8

So, 15 – 7 = 8

Therefore, 8 more fish Jayson caught than Ashlyn.

**Test Practice**

Question 16.

Cris has 14 jump ropes. What doubles fact shows the number of jump ropes Cris has?

(A) 7 + 8 = 14 jump ropes

(B) 7 + 7 = 14 jump ropes

(C) 14 – 5 = 9 jump ropes

(D) 6 + 6 = 12 jump ropes

Answer:

(B) 7 + 7 = 14 jump ropes

Explanation:

Cris has 14 jump ropes

The doubles fact is 7 + 7 = 14.

**Reflect**

**Show the ways to subtract**

**Essential Question?**

What strategies can I use to subtract?

Count Back

12, ___, ___, ___

12 – 3 = ___

Answer:

12, 11, 10, 9

12 – 3 = 9

Explanation:

Start at 12

Count back by 3

11, 10, 9

So, 12 – 3 = 9.

Use Doubles

10 + 10 = ___

20 – 10 = ___

Answer:

10 + 10 = 20

20 – 10 = 10

Explanation:

10 + 10 =20 is the doubles fact

So, 20 – 10 = 10

The related subtraction fact is 20 – 10 = 10.

Make a ten

So, 17 – 8 = ___

Answer:

Explanation:

17 – 8 =

Make ten

8 = 7 and 1

= 17- 7 – 1

= 10 – 1

= 9

So, 17 – 8 = 9.

Missing addend

5 + = 14

14 – 5 =

Answer:

5 + = 14

14 – 5 =

Explanation:

I wrote the missing addend by subtracting

14 – 5 =9

The missing addend is 9

So, 5 + 9 = 14.