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Number Sentences
1. William played an unknown number of video games.
He beat 10 levels on each game and 80 levels in all.
This story can be written as the number sentence below:
n × 10 = 80
Use the number sentence to find how many video games, n, William played.
A. 70
B. 10
C. 8
D. 80
2. There are 8 trees in Jeffrey's yard.
There are an unknown number of squirrels in each tree and 40 squirrels in all.
This story can be written as the number sentence below:
8 × n = 40
Use the number sentence to find how many squirrels, n, are in each tree.
A. 32
B. 5
C. 40
D. 8
3.
4. Which number makes the sentence true?
3×
A. 4
B. 5
C. 3
D. 2
5. Which number makes the sentence true?
1×6=
A. 4
B. 5
C. 6
D. 7
=9
6. Which number makes the sentence true?
A. 6
B. 8
C. 2
D. 4
4
÷1=
7. Kevin does not know how many hours he slept in all over the last
3 nights. He knows he slept 10 hours each night.
This story can be written as the number sentence below:
n ÷ 3 = 10
Use the number sentence to help Kevin find how many hours of sleep, n, he slept in all.
A. 30
B. 13
C. 3
D. 10
6. Directions:
A. Find the missing number in each number sentence.
B. B. Write the correct answer above the ?
C. Based on the missing number, put the number sentences in order from least to greatest.
9 × ? = 27
40 ÷ ? = 5
,
,
24 ÷ ? = 4
Answers
1. C
2. B
3. C
4. C
5. D
6. ---7. ---8. A
9. ---10. D
Explanations
16 ÷
=4
1. When using a number sentence, think about what number will make the number sentence true.
n × 10 = 80
Use another number sentence from the same fact family to find the missing number.
80 ÷ 10 = 8
80 ÷ 8 = 10
8 × 10 = 80
10 × 8 = 80
The number sentence 8 × 10 = 80 matches the number sentence given in the situation.
The missing number, 8, stands for the number of video games William played.
So, William played 8 video games.
2. When using a number sentence, think about what number will make the number sentence true.
8 × n = 40
Use another number sentence from the same fact family to find the missing number.
40 ÷ 8 = 5
40 ÷ 5 = 8
8 × 5 = 40
5 × 8 = 40
The number sentence 8 × 5 = 40 matches the number sentence given in the situation.
The missing number, 5, stands for the number of squirrels in each tree.
So, there are 5 squirrels in each tree.
3. To find the number that makes the sentence true, get the blank by itself on one side of the equal sign using
opposite operations.
Initial Equation
3×
=9
Divide both sides by 3.
3÷3×
=9÷3
=3
4. The result of any number multiplied by one is the number.
So, the number that makes the number sentence true is 6.
5. Any number divided by one is the number.
So, the number that makes the number sentence true is 4.
6.
Terri has 36 magazines split into 4 equal piles. Use division to solve.
Then, rearrange to find the missing number. The number sentence 36 ÷ n = 4 is in the same fact family as 36 ÷ 4
= n, so the missing number will be the same in both number sentences.
So, Terri put 9 magazines into each pile.
7.
Sam has 4 equal stacks of quarters and 32 quarters in all. Multiply 4 times a missing number to get 32.
Use the opposite operation of multiplication, which is division, to find the missing number.
So, Sam has 8 quarters in each stack.
8. When using a number sentence, think about what number will make the number sentence true.
n ÷ 3 = 10
Use another number sentence from the same fact family to find the missing number.
3 × 10 = n
3 × 10 = 30
30 ÷ 3 = 10
The missing number is 30, which means that Kevin slept 30 hours in all.
9.
Solve each number sentence.
Since 3 < 6 < 8, the correct order is 9 × ? = 27, then 24 ÷ ? = 4, then 40 ÷ ? = 5.
10. To find the number that makes the sentence true, get the blank by itself on one side of the equal sign using
opposite operations.
Initial Equation
Multiply both sides by
.
16 ÷
=4
16 ×
÷
=4×
16 = 4 ×
Divide both sides by 4.
16 ÷ 4 = 4 ÷ 4 ×
4=