Sure! Let’s solve each problem step by step. These are all
adding and subtracting rational numbers — which include integers, decimals, and fractions (though here we’re dealing with decimals and whole numbers).
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Key Rules to Remember:
- Subtracting a negative is the same as adding a positive:
`a - (-b) = a + b`
- Adding a negative is the same as subtracting:
`a + (-b) = a - b`
- When adding or subtracting decimals, align decimal points.
- Pay attention to signs!
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Let’s go one by one:
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1) 2 - (-73)
→ Subtracting a negative = adding a positive
→ `2 + 73 = 75`
✔ Answer: 75
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2) 39 + (-20.4)
→ Adding a negative = subtracting
→ `39 - 20.4 = 18.6`
✔ Answer: 18.6
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3) 67.086 - (-20)
→ Subtracting a negative = adding a positive
→ `67.086 + 20 = 87.086`
✔ Answer: 87.086
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4) 60 + (-19)
→ Adding a negative = subtracting
→ `60 - 19 = 41`
✔ Answer: 41
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5) 87 - 64.05
→ Straight subtraction
→ `87.00 - 64.05 = 22.95`
✔ Answer: 22.95
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6) 93 - (-31)
→ Subtracting a negative = adding a positive
→ `93 + 31 = 124`
✔ Answer: 124
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7) 2 + 17.02
→ Simple addition
→ `2.00 + 17.02 = 19.02`
✔ Answer: 19.02
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8) 3.008 + (-46)
→ Adding a negative = subtracting
→ `3.008 - 46 = -42.992`
✔ Answer: -42.992
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9) 85.082 + 48.11
→ Add decimals
→ `85.082 + 48.110 = 133.192`
✔ Answer: 133.192
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10) 56.95 + 40
→ `56.95 + 40.00 = 96.95`
✔ Answer: 96.95
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11) 66 - 86.005
→ `66.000 - 86.005 = -20.005`
✔ Answer: -20.005
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12) 20 - (-4.09)
→ Subtracting a negative = adding
→ `20 + 4.09 = 24.09`
✔ Answer: 24.09
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13) 68 - 55
→ Simple subtraction
→ `68 - 55 = 13`
✔ Answer: 13
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14) 17 - (-58.12)
→ Subtracting a negative = adding
→ `17 + 58.12 = 75.12`
✔ Answer: 75.12
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15) 17.001 + 78
→ `17.001 + 78.000 = 95.001`
✔ Answer: 95.001
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16) 32 + (-72.1)
→ `32 - 72.1 = -40.1`
✔ Answer: -40.1
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17) 36.289 + (-83.73)
→ `36.289 - 83.73 = -47.441`
✔ Answer: -47.441
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18) 12.006 - (-49.29)
→ Subtracting a negative = adding
→ `12.006 + 49.29 = 61.296`
✔ Answer: 61.296
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19) 51.8 + (-92.004)
→ `51.8 - 92.004 = -40.204`
✔ Answer: -40.204
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20) 59.22 - 33.82
→ `59.22 - 33.82 = 25.40`
✔ Answer: 25.4
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##
✔ Final Answers List:
1.
75
2.
18.6
3.
87.086
4.
41
5.
22.95
6.
124
7.
19.02
8.
-42.992
9.
133.192
10.
96.95
11.
-20.005
12.
24.09
13.
13
14.
75.12
15.
95.001
16.
-40.1
17.
-47.441
18.
61.296
19.
-40.204
20.
25.4
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Let me know if you’d like this in a printable format or need explanations for any specific problem!
Parent Tip: Review the logic above to help your child master the concept of rational number worksheet.
