All the solutions provided in **McGraw Hill My Math Grade 1 Answer Key PDF** **Chapter 3 Review **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Chapter 3 Review Answer Key

**Vocabulary Check**

**Complete each sentence.**

addends count on doubles

doubles minus 1 doubles plus 1 number line

Question 1.

Two addends that are the same number are called ____

Answer:

Two addends that are the same number are called doubles.

Question 2.

You can use a number line to ____ numbers to find the sum.

Answer:

You can use a number line to count on numbers to find the sum.

Question 3.

Any numbers being added together are called ____

Answer:

Any numbers being added together are called addends.

Question 4.

To add with doubles plus one is called ______

Answer:

To add with doubles plus one is called count on doubles.

**Concept Check**

**Start with the greater number. Count on to add.**

Question 5.

7 + 2 = ____

Answer:

9

Explanation:

I started with 7

Counted 2 more

8 , 9

So, 7 + 2 = 9.

Question 6.

1 + 6 = ______

Answer:

7

Explanation:

I started with 6

Counted 1 more

7

So, 1 + 6 = 7.

Question 7.

4 + 3 = ____

Answer:

7

Explanation:

I started with 4

Counted 3 more

5, 6, 7

So, 4 + 3 = 7.

Question 8.

5 + 5 = _____

Answer:

10

Explanation:

I started with 5

Counted 5 more

6, 7, 8, 9, 10

So, 5 + 5 = 10.

**Make a ten to add.**

Question 9.

Answer:

Explanation:

8 + 4 =

8 + 2 + 2

10 + 2 = 12

So, 8 + 4 = 12.

Question 10.

Answer:

Explanation:

9 + 9 =

9 + 1 + 8

10 + 8 = 18

So, 9 + 9 = 18.

Question 11.

Answer:

Explanation:

8 + 3 =

8 + 2 + 1

10 + 1 = 11

So, 8 + 3 = 11.

**Write the addends. Add.**

Question 12.

Answer:

Explanation:

I used to solve the problem

5 + 2 = 7

2 + 5 = 7

If you change the order of the addends, you get the same sum

So, 5 + 2 = 2+ 5 = 7.

Question 13.

Answer:

Explanation:

I used to solve the problem

4 + 5 = 9

5 + 4 = 9

If you change the order of the addends, you get the same sum

So, 4 + 5 = 5 + 4 = 9.

**Add the doubles or make a ten. Write that number. Add the other number to find the sum.**

Question 14.

Answer:

Explanation:

I added doubles 3 + 3 = 6

Then i added the other number

6 + 5 = 11

So, 3 + 3 + 5 = 11.

Question 15.

Answer:

Explanation:

I added 1 and 9 to make 10

Then i added 7

10 + 7 = 17

So, 1 + 7 + 9 = 17.

**Problem Solving**

Question 16.

Lea drank 2 glasses of milk. Juan drank 3 glasses of milk. How many glasses of milk did they drink in all?

____ glasses

Answer:

2 + 3 = 5

5 glasses

Explanation:

Lea drank 2 glasses of milk

Juan drank 3 glasses of milk

Start at 3 count on 2 more

4, 5

So, 2 + 3 = 5

Therefore, they drank 5 glasses of milk in all.

Question 17.

Jenny has 7 books from the library. Katy has 4 more books than Jenny. How many books does Katy have?

____ books

Answer:

7 + 4 = 11

11 books

Explanation:

Jenny has 7 books from the library

Katy has 4 more books than Jenny

Make Ten:

7 + 4 =

7 + 3 + 1

10 + 1 = 11

So, 7 + 4 = 11

Therefore, Katy have 11 books.

**Test Practice**

Question 18.

4 dogs play in the park. 4 dogs swim in the river. How many dogs are there in all?

(A) 4

(B) 6

(C) 8

(D) 10

Answer:

(C) 8

Explanation:

4 dogs play in the park

4 dogs swim in the river

Use doubles fact to add

4 + 4 = 8

So, 8 dogs are there in all.

**Reflect**

**Show the strategies you use to add.**

Answer:

Explanation:

We can use many strategies to add numbers.