7th Grade Math · Unit 7
Choose addition, subtraction, multiplication, or division from the story.
Match the story
The operation comes from the story.
Drops and equal groups
A drop is subtraction or adding a negative.
Equal groups are multiplication or division.
Add a signed change
Adding a negative is subtraction.
result = 20 − 3.5
result = 16.5
Answer: 16.5 degrees
result = start + change
result = 6.2 + 1.4
result = 7.6
Answer: 7.6 degrees
Adding a negative is subtraction.
result = 4.5 − 2.5
result = 2
Answer: 2 degrees
Adding a negative is subtraction.
result = 14.25 − 2.5
result = 11.75
Answer: 11.75 meters
result = start + change
result = 8 + 3.75
result = 11.75
Answer: 11.75 meters
result = start + change
result = −12.5 + 4.25
result = −8.25
Answer: −8.25 meters
Adding a negative is subtraction.
result = 10.5 − 4.25
result = 6.25
Answer: 6.25 dollars
result = start + change
result = 3.25 + 1.5
result = 4.75
Answer: 4.75 dollars
Adding a negative is subtraction.
result = 15 − 6.5
result = 8.5
Answer: 8.5 dollars
result = start + change
result = 7.5 + 2.25
result = 9.75
Answer: 9.75 points
result = start + change
result = −2.5 + 6
result = 3.5
Answer: 3.5 points
Equal groups
result = number of groups × amount in each group
result = 4 × −1.5
result = −6
Answer: −6 points
result = number of groups × amount in each group
result = 3 × 2.5
result = 7.5
Answer: 7.5 dollars
result = number of groups × amount in each group
result = 5 × 1.25
result = 6.25
Answer: 6.25 meters
result = number of groups × amount in each group
result = 6 × −0.75
result = −4.5
Answer: −4.5 degrees
result = number of groups × amount in each group
result = 2 × 4.5
result = 9
Answer: 9 points
result = number of groups × amount in each group
result = 8 × −1.25
result = −10
Answer: −10 meters
result = total ÷ number of groups
result = 3.75 ÷ 3
result = 1.25
Answer: 1.25 meters
result = total ÷ number of groups
result = 8.4 ÷ 4
result = 2.1
Answer: 2.1 dollars
result = total ÷ number of groups
result = −6.3 ÷ 3
result = −2.1
Answer: −2.1 points
result = total ÷ number of groups
result = 12.5 ÷ 5
result = 2.5
Answer: 2.5 liters
result = total ÷ number of groups
result = 9.6 ÷ 8
result = 1.2
Answer: 1.2 meters
A fraction story
Add.
−12 + 13
The common denominator is 6.
−12 + 13
−16
Answer: −16 points
Add.
Adding a negative is subtraction.
34 − 14
The common denominator is 4.
34 − 14
12
Answer: 12 dollars
Add.
Adding a negative is subtraction.
−23 − 16
The common denominator is 6.
−23 − 16
−56
Answer: −56 degrees
Add.
58 + 18
The common denominator is 8.
58 + 18
34
Answer: 34 meters
Subtract.
34 − 12
The common denominator is 4.
34 − 12
14
Answer: 14 points
Subtract.
−13 − 16
The common denominator is 6.
−13 − 16
−12
Answer: −12 degrees
Subtract.
Subtracting a negative is addition.
56 + 13
The common denominator is 6.
56 + 13
76
Answer: 76 meters
Multiply.
23 × −34
Multiply the numerators. Multiply the denominators.
−612
−12
Answer: −12 pounds
Multiply.
−12 × −45
Multiply the numerators. Multiply the denominators.
410
25
Answer: 25 points
Divide.
34 ÷ 12
Multiply by the reciprocal of 12.
34 × 2
64
32
Answer: 32 meters
Divide.
−23 ÷ 45
Multiply by the reciprocal of 45.
−23 × 54
−1012
−56
Answer: −56 points
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