All the solutions provided in McGraw Hill My Math Grade 2 Answer Key PDF Chapter 1 Review will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 2 Chapter 1 Review Answer Key
Vocabulary Check
add addend count back count on
fact family related facts subtract
Write the correct word in the blank.
Use words from the box.
Question 1.
When you take one part away from a whole, you ______
Answer:
Subtract
Explanation:
When you take one part away from a whole, you subtract
Question 2.
Addition and subtraction facts that use the same three numbers can be called a ____ or ____.
Answer:
Explanation:
Addition and subtraction facts that use the same three numbers can be called a fact family or related fact
Question 3.
The two numbers you add together in an addition sentence are called ____.
Answer:
Addends
Explanation:
The two numbers you add together in an addition sentence are called addends.
Question 4.
You can _____ to subtract 2 from a number.
Answer:
Count back
Explanation:
You can Count back to subtract 2 from a number.
Question 5.
To ____, you join two parts together.
Answer:
Add
Explanation:
To add, you join two parts together.
Question 6.
You can ____ to add 2 to a number.
Answer:
Count on
Explanation:
You can Count on to add 2 to a number.
Concept Check
Add.
Question 7.
Answer:
Explanation:
The sum of 9 and 3 is 12
9 + 3 = 12
Question 8.
Answer:
Explanation:
The sum of 8 and 5 is 13
8 + 5 = 13
Question 9.
Answer:
Explanation:
The sum of 9 and 6 is 15
9 + 6 = 15
Question 10.
Answer:
Explanation:
The sum of 7 and 7 is 14
7 + 7 = 14
Find each sum.
Question 11.
6 + 5 + 4 = ____
Answer:
6 + 5 + 4 = 15
Explanation:
We can add the addends in any way
the sum remains the same
5 + 4 = 9
9 + 6 = 15
Question 12.
2 + 2 + 8 = ____
Answer:
2 + 2 + 8 = 12
Explanation:
We can add the addends in any way
the sum remains the same
8 + 2 = 10
10 + 2 = 12
Use addition facts to subtract.
Question 13.
7 + 8 = ____
15 – 7 = ____
Answer:
7 + 8 = 15
15 – 7 = 8
Explanation:
7 + 8 = 15 is a addition fact
We are using a addition fact to subtract
Question 14.
6 + 7 = ____
13 – 7 = ____
Answer:
6 + 7 = 13
13 – 7 = 6
Explanation:
6 + 7 = 13 is a addition fact
We are using a addition fact to subtract
Complete the fact family.
Question 15.
____ + ____ = ____
____ + ____ = ____
____ – ____ = ____
____ – ____ = ____
Answer:
9 + 5 = 14
5 + 9 = 14
14 – 9 = 5
14 – 5 = 9
Explanation:
We can add the addends in any way but,
the sum remains the same
By using the facts we are finding the difference of the addition facts
Problem Solving
Question 16.
Dotty has 8 red flowers and 2 pink flowers. She gives 5 flowers to her mother. How many flowers does Dotty have left?
______ flowers
Answer:
5 flowers
Explanation:
Dotty has 8 red flowers and 2 pink flowers.
8 + 2 = 10
She gives 5 flowers to her mother.
10 – 5 = 5
5 flowers that Dotty have left.
Question 17.
Oscar finds 6 leaves ¡n the morning. He finds 2 more leaves after lunch. He already has 8 leaves. How many
leaves does he have in all?
______ leaves
Answer:
16 leaves
Explanation:
Oscar finds 6 leaves ¡n the morning.
He finds 2 more leaves after lunch.
6 + 2 = 8
He already has 8 leaves.
8 + 8 = 16
16 leaves he had in all.
Question 18.
Shani walks the dogs in her neighborhood. One neighbor has 4 dogs. Another neighbor has 3 dogs. How many dogs does she walk?
____ dogs
Answer:
7 dogs
Explanation:
One neighbor has 4 dogs. Another neighbor has 3 dogs.
4 + 3 = 7
she makes to walk 7 dogs in all.
Test Practice
Question 19.
Rod throws 5 baseballs. Ty throws the same number of baseballs as Rod. How many baseballs did they throw in all?
(A) 0
(B) 5
(C) 10
(D) 15
Answer:
C
Explanation:
Rod throws 5 baseballs.
Ty throws the same number of baseballs as Rod.
5 + 5 = 10
10 baseballs that they throw in all.
Reflect
Show different strategies to add and subtract.
Make a 10.
5 + 9 = ____
10 + ____ = ____
Explanation:
5 + 9 = 14
10 + 4 = 14
5 is written as 4 and 1
Use doubles to add and subtract.
7 + 7 = ___
14 – 7 = ___
Explanation:
7 + 7 = 14
14 – 7 = 7
ESSENTIAL QUESTION ?
What strategies can I use to add and subtract?
Complete the fact family.
2 + 5 = 7
____ + ____ = _____
____ – ____ = _____
____ – ____ = _____
Explanation:
2 + 5 = 7
5 + 2 = 7
7 – 2 = 5
7 – 5 = 2
We can add the addends in any way but,
the sum remains the same
By using the facts we are finding the difference of the addition facts
Find the missing addend.
3 + ____ = 9
9 – 3 = ____
Explanation:
3 + 6 = 9
9 – 3 = 6
3 + 6 = 9 is a addition fact
We are using a addition fact to subtract