7th Grade Adding and Subtracting Decimals Worksheet — Level 1 — Practice Set 3 — Answers
Answer sheet with worked solutions for the 7th Grade decimals worksheet.
7th Grade Adding and Subtracting Decimals Worksheet — Level 1 — Practice Set 3 — Answers
Line up the decimal points before you add or subtract.
1.
4.2
+13.8
Answer: 18.0
- Line up the decimal points
- 4.2 + 13.8 = 18.0
2.
48.9
+8.4
Answer: 57.3
- Line up the decimal points
- 48.9 + 8.4 = 57.3
3.
19.7
−16.5
Answer: 3.2
- Line up the decimal points
- 19.7 − 16.5 = 3.2
4.
14.5
−2.5
Answer: 12.0
- Line up the decimal points
- 14.5 − 2.5 = 12.0
5.
25.9
−4.7
Answer: 21.2
- Line up the decimal points
- 25.9 − 4.7 = 21.2
6.
27.9
−5.9
Answer: 22.0
- Line up the decimal points
- 27.9 − 5.9 = 22.0
7.
45.9
−23.0
Answer: 22.9
- Line up the decimal points
- 45.9 − 23.0 = 22.9
8.
55.6
+8.8
Answer: 64.4
- Line up the decimal points
- 55.6 + 8.8 = 64.4
9.
6.7
+38.5
Answer: 45.2
- Line up the decimal points
- 6.7 + 38.5 = 45.2
10.
16.8
+9.5
Answer: 26.3
- Line up the decimal points
- 16.8 + 9.5 = 26.3
11.
6.7
+9.2
Answer: 15.9
- Line up the decimal points
- 6.7 + 9.2 = 15.9
12.
14.1
+36.2
Answer: 50.3
- Line up the decimal points
- 14.1 + 36.2 = 50.3
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.