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.

Vocabulary Check

Complete each sentence.

doubles minus 1 doubles plus 1 number line

Question 1.
Two addends that are the same number are called ____
Two addends that are the same number are called doubles.

Question 2.
You can use a number line to ____ numbers to find the sum.
You can use a number line to count on numbers to find the sum.

Question 3.
Any numbers being added together are called ____

Question 4.
To add with doubles plus one is called ______
To add with doubles plus one is called count on doubles.

Concept Check

Question 5.
7 + 2 = ____
9

Explanation:
I started with 7
Counted 2 more
8 , 9
So, 7 + 2 = 9.

Question 6.
1 + 6 = ______
7

Explanation:
I started with 6
Counted 1 more
7
So, 1 + 6 = 7.

Question 7.
4 + 3 = ____
7

Explanation:
I started with 4
Counted 3 more
5, 6, 7
So, 4 + 3 = 7.

Question 8.
5 + 5 = _____
10

Explanation:
I started with 5
Counted 5 more
6, 7, 8, 9, 10
So, 5 + 5 = 10.

Question 9.

Explanation:
8 + 4 =
8 + 2 + 2
10 + 2 = 12
So, 8 + 4 = 12.

Question 10.

Explanation:
9 + 9 =
9 + 1 + 8
10 + 8 = 18
So, 9 + 9 = 18.

Question 11.

Explanation:
8 + 3 =
8 + 2 + 1
10 + 1 = 11
So, 8 + 3 = 11.

Question 12.

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.

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.

Explanation:
I added doubles 3 + 3 = 6
Then i added the other number
6 + 5 = 11
So, 3 + 3 + 5 = 11.

Question 15.

Explanation:
I added 1 and 9 to make 10
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

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
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
(C) 8

Explanation:
4 dogs play in the park
4 dogs swim in the river
4 + 4 = 8
So, 8 dogs are there in all.

Reflect

Show the strategies you use to add.

Explanation:
We can use many strategies to add numbers.

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