7th Grade Adding and Subtracting Decimals Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the 7th Grade decimals worksheet.
7th Grade Adding and Subtracting Decimals Worksheet — Level 1 — Answers
Line up the decimal points before you add or subtract.
1.
52.9
+13.0
Answer: 65.9
- Line up the decimal points
- 52.9 + 13.0 = 65.9
2.
44.0
+11.2
Answer: 55.2
- Line up the decimal points
- 44.0 + 11.2 = 55.2
3.
20.0
+39.2
Answer: 59.2
- Line up the decimal points
- 20.0 + 39.2 = 59.2
4.
20.1
−9.7
Answer: 10.4
- Line up the decimal points
- 20.1 − 9.7 = 10.4
5.
49.8
−37.5
Answer: 12.3
- Line up the decimal points
- 49.8 − 37.5 = 12.3
6.
5.3
+22.6
Answer: 27.9
- Line up the decimal points
- 5.3 + 22.6 = 27.9
7.
58.2
−7.7
Answer: 50.5
- Line up the decimal points
- 58.2 − 7.7 = 50.5
8.
38.9
−12.5
Answer: 26.4
- Line up the decimal points
- 38.9 − 12.5 = 26.4
9.
19.9
+12.1
Answer: 32.0
- Line up the decimal points
- 19.9 + 12.1 = 32.0
10.
54.2
−12.7
Answer: 41.5
- Line up the decimal points
- 54.2 − 12.7 = 41.5
11.
36.3
−6.5
Answer: 29.8
- Line up the decimal points
- 36.3 − 6.5 = 29.8
12.
33.0
−12.3
Answer: 20.7
- Line up the decimal points
- 33.0 − 12.3 = 20.7
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.