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.