Let's solve each problem step by step.
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a) (-16) − (2)
Subtracting a positive number is the same as adding its negative:
(-16) − 2 = -18
✔ Answer: -18
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b) (-20) + (-30)
Adding two negative numbers:
-20 − 30 = -50
✔ Answer: -50
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c) 9 + (-9) + 5
First, 9 + (-9) = 0
Then, 0 + 5 = 5
✔ Answer: 5
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d) (-34) − (-6)
Subtracting a negative is the same as adding:
-34 + 6 = -28
✔ Answer: -28
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e) (-12) − 7
Subtracting a positive number from a negative:
-12 − 7 = -19
✔ Answer: -19
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f) 70 + 12 − (-32)
First, 70 + 12 = 82
Then, subtracting a negative: 82 − (-32) = 82 + 32 = 114
✔ Answer: 114
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g) (-56) + 78
Add a negative and a positive:
78 − 56 = 22
✔ Answer: 22
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h) (-3) − (-4)
Subtracting a negative is adding:
-3 + 4 = 1
✔ Answer: 1
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i) 8 + (-4) + (-12)
Step-by-step:
8 − 4 = 4
4 − 12 = -8
✔ Answer: -8
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j) (-13) + (4)
-13 + 4 = -9
✔ Answer: -9
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k) -45 − (-45)
Subtracting a negative:
-45 + 45 = 0
✔ Answer: 0
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l) 6 + (-8) + (-3)
6 − 8 = -2
-2 − 3 = -5
✔ Answer: -5
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M) Temperature Problem
Given:
- At 6:00 pm: 87°C
- By 10:00 pm: decreased by 12°C
Expression:
87 − 12
Solution:
87 − 12 = 75
✔ Expression: 87 − 12
✔ Solution: 75
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✔ Final Answers:
a)
-18
b)
-50
c)
5
d)
-28
e)
-19
f)
114
g)
22
h)
1
i)
-8
j)
-9
k)
0
l)
-5
m) Expression:
87 − 12, Solution:
75
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Parent Tip: Review the logic above to help your child master the concept of adding and subtracting integer worksheet.
