Year 7 Adding and Subtracting Decimals Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 7 decimals worksheet.
Year 7 Adding and Subtracting Decimals Worksheet — Level 1 — Answers
Line up the decimal points before you add or subtract.
1.
3.7
+34.3
Answer: 38.0
- Line up the decimal points
- 3.7 + 34.3 = 38.0
2.
38.7
+40.7
Answer: 79.4
- Line up the decimal points
- 38.7 + 40.7 = 79.4
3.
26.3
−22.1
Answer: 4.2
- Line up the decimal points
- 26.3 − 22.1 = 4.2
4.
23.1
−7.8
Answer: 15.3
- Line up the decimal points
- 23.1 − 7.8 = 15.3
5.
30.7
+21.6
Answer: 52.3
- Line up the decimal points
- 30.7 + 21.6 = 52.3
6.
30.3
−25.1
Answer: 5.2
- Line up the decimal points
- 30.3 − 25.1 = 5.2
7.
45.1
+32.9
Answer: 78.0
- Line up the decimal points
- 45.1 + 32.9 = 78.0
8.
60.5
+8.7
Answer: 69.2
- Line up the decimal points
- 60.5 + 8.7 = 69.2
9.
27.1
−10.7
Answer: 16.4
- Line up the decimal points
- 27.1 − 10.7 = 16.4
10.
32.8
−25.6
Answer: 7.2
- Line up the decimal points
- 32.8 − 25.6 = 7.2
11.
4.9
+5.2
Answer: 10.1
- Line up the decimal points
- 4.9 + 5.2 = 10.1
12.
15.3
−15.1
Answer: 0.2
- Line up the decimal points
- 15.3 − 15.1 = 0.2
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.