Let’s solve each problem step by step. Remember: when subtracting a decimal from a whole number, line up the decimal points and borrow if needed — just like regular subtraction!
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1. 18 - 0.8 = ?
Think of 18 as 18.0
Now subtract:
18.0
– 0.8
= 17.2
✔ Answer: 17.2
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2. 8 - 0.07 = ?
Write 8 as 8.00
Subtract:
8.00
– 0.07
= 7.93
✔ Answer: 7.93
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3. 12 - 1.3 = ?
Write 12 as 12.0
Subtract:
12.0
– 1.3
= 10.7
✔ Answer: 10.7
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4. 15 - 1.3 = ?
Same idea: 15.0 – 1.3 = 13.7
✔ Answer: 13.7
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5. 4 - 0.004 = ?
Write 4 as 4.000
Subtract:
4.000
– 0.004
= 3.996
✔ Answer: 3.996
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6. 1 - 1.1 = ?
This is tricky! You’re taking away more than you have.
1.0 – 1.1 = –0.1 (negative answer)
✔ Answer: -0.1
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7. 15 - 0.008 = ?
15.000 – 0.008 = 14.992
✔ Answer: 14.992
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8. 17 - 0.019 = ?
17.000 – 0.019 = 16.981
✔ Answer: 16.981
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9. 5 - 1.5 = ?
5.0 – 1.5 = 3.5
✔ Answer: 3.5
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10. 16 - 0.003 = ?
16.000 – 0.003 = 15.997
✔ Answer: 15.997
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11. 11 - 0.019 = ?
11.000 – 0.019 = 10.981
✔ Answer: 10.981
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12. 12 - 0.05 = ?
12.00 – 0.05 = 11.95
✔ Answer: 11.95
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13. 5 - 0.07 = ?
5.00 – 0.07 = 4.93
✔ Answer: 4.93
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14. 18 - 0.20 = ?
18.00 – 0.20 = 17.80 → which is same as 17.8
✔ Answer: 17.8
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15. 17 - 0.19 = ?
17.00 – 0.19 = 16.81
✔ Answer: 16.81
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16. 5 - 0.013 = ?
5.000 – 0.013 = 4.987
✔ Answer: 4.987
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Final Answer:
1. 17.2
2. 7.93
3. 10.7
4. 13.7
5. 3.996
6. -0.1
7. 14.992
8. 16.981
9. 3.5
10. 15.997
11. 10.981
12. 11.95
13. 4.93
14. 17.8
15. 16.81
16. 4.987
Parent Tip: Review the logic above to help your child master the concept of adding decimal numbers worksheet.
