All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 2 Review will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 1 Chapter 2 Review Answer Key
Complete each sentence.
difference related facts
subtract subtraction number sentence
Question 1.
Addition and subtraction number sentences that use the same numbers are called _____.
Answer:
Addition and subtraction number sentences that use the same numbers are called related facts.
Question 2.
9 – 7 = 2 is a _________
Answer:
9 – 7 = 2 is a subtraction number sentence.
Question 3.
When you take away, you _________
Answer:
When you take away, you subtract.
Question 4.
In 7 – 4 = 3, the 3 is the _________
Answer:
In 7 – 4 = 3, the 3 is the difference.
Concepts Check
Write a subtraction number sentence.
Question 5.
Answer:
Explanation:
The difference of 7 and 3 is 4
So, 7 – 3 = 4.
Subtract
Question 6.
5 – 1 = ____
Answer:
4
Explanation:
The difference of 5 and 1 is 4
So, 5 – 1 = 4.
Question 7.
4 – 2 = ____
Answer:
2
Explanation:
The difference of 4 and 2 is 2
So, 4 – 2 = 2.
Question 8.
7 – 5 = ___
Answer:
2
Explanation:
The difference of 7 and 5 is 2
So, 7 – 5 = 2.
Question 9.
9 – 5 = ____
Answer:
4
Explanation:
The difference of 9 and 5 is 4
So, 9 – 5 = 4.
Question 10.
Answer:
Explanation:
The difference of 8 and 4 is 4.
Question 11.
Answer:
Explanation:
The difference of 6 and 1 is 5.
Question 12.
Answer:
Explanation:
The difference of 4 and 0 is 4.
Question 13.
Answer:
Explanation:
The difference of 9 and 2 is 7.
Question 14.
Answer:
Explanation:
The difference of 8 and 3 is 5.
Question 15.
Answer:
Explanation:
The difference of 7 and 5 is 2.
Write the related subtraction facts.
Question 16.
6 + 2 =____
____ – ____ = ____
____ – ____ = ____
Answer:
6 + 2 = 8
8 – 2 = 6
8 – 6 = 2
Explanation:
The given addition fact is
6 + 2 = 8
The related subtraction facts for the above addition fact are 8 – 2 = 6 and 8 – 6 = 2.
Determine if each subtraction statement is true or false. Circle true or false.
Question 17.
10 – 3 = 7
true false
Answer:
Explanation:
10 – 3 = 7
So, the subtraction statement is true.
Question 18.
3 = 6 – 2
true false
Answer:
Explanation:
3 = 6 – 2
So, the subtraction statement is false.
Problem Solving
Write a subtraction number sentence.
Question 19.
Angel has 7 bananas. She eats 2 of them. How many bananas are left?
bananas
Answer:
Explanation:
Angel has 7 bananas
She eats 2 of them
7 – 2 =
Start at 7
Count back 2
6, 5
So, 7 – 2 = 5
Therefore, 5 bananas are left.
Circle true or false.
Question 20.
There are 9 bears on a tree. 3 of them leave. 6 bears are still on the tree.
true false
Answer:
Explanation:
There are 9 bears on a tree
3 of them leave
6 bears are still on the tree
9 – 3 = 6
So, the above statement is true.
Test Practice
Find the matching subtraction number sentence.
Question 21.
There are 5 elephants. There are 3 leopards. How many fewer leopards are there?
(A) 5 – 3 =1 fewer leopards
(B) 5 – 3 = 2 fewer leopards
(C) 5 – 3 = 1 fewer elephants
(D) 5 – 3 = 4 fewer elephants
Answer:
(B) 5 – 3 = 2 fewer leopards
Explanation:
There are 5 elephants
There are 3 leopards
Subtract 3 from 5
5 – 3 = 2
So, there are 2 fewer leopards.
Reflect
Show ways to answer.
Find the missing number.
Answer:
Explanation:
7 – 3 = 4
So, the missing number is 4
Therefore, 4 + 3 = 7.
subtract 0.
8 – 0 = ____
Answer:
8
Explanation:
If we subtract 0 from any number the answer will be the number itself
So, 8 – 0 = 8.
Essential Question?
How do you subtract numbers?
Subtract.
Answer:
Explanation:
9 – 7 = 2
The difference of 9 and 7 is 2.
Write a subtraction number sentence.
Answer:
Explanation:
The difference of 10 and 7 is 3
So, 10 – 7 = 3.