Here are the solutions for the subtraction problems. To solve these, remember to line up the decimal points. If you are subtracting a decimal from a whole number, you can add zeros to the end of the whole number to make it easier (for example, think of 18 as 18.0 or 18.000).
1.
18 - 0.8
Think of 18 as 18.0.
$18.0 - 0.8 = 17.2$
2.
8 - 0.07
Think of 8 as 8.00.
$8.00 - 0.07 = 7.93$
3.
12 - 1.3
Think of 12 as 12.0.
$12.0 - 1.3 = 10.7$
4.
15 - 1.3
Think of 15 as 15.0.
$15.0 - 1.3 = 13.7$
5.
4 - 0.004
Think of 4 as 4.000.
$4.000 - 0.004 = 3.996$
6.
1 - 1.1
Since 1.1 is larger than 1, the answer will be negative.
$1.0 - 1.1 = -0.1$
7.
15 - 0.008
Think of 15 as 15.000.
$15.000 - 0.008 = 14.992$
8.
17 - 0.019
Think of 17 as 17.000.
$17.000 - 0.019 = 16.981$
9.
5 - 1.5
Think of 5 as 5.0.
$5.0 - 1.5 = 3.5$
10.
16 - 0.003
Think of 16 as 16.000.
$16.000 - 0.003 = 15.997$
11.
11 - 0.019
Think of 11 as 11.000.
$11.000 - 0.019 = 10.981$
12.
12 - 0.05
Think of 12 as 12.00.
$12.00 - 0.05 = 11.95$
13.
5 - 0.07
Think of 5 as 5.00.
$5.00 - 0.07 = 4.93$
14.
18 - 0.20
Think of 18 as 18.00.
$18.00 - 0.20 = 17.80$ (or just 17.8)
15.
17 - 0.19
Think of 17 as 17.00.
$17.00 - 0.19 = 16.81$
16.
5 - 0.013
Think of 5 as 5.000.
$5.000 - 0.013 = 4.987$
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 for 5th grade decimal worksheet.
