Year 7 Adding and Subtracting Decimals Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 7 decimals worksheet.
Year 7 Adding and Subtracting Decimals Worksheet — Level 1 — Practice Set 4 — Answers
Line up the decimal points before you add or subtract.
1.
18.2
+19.1
Answer: 37.3
- Line up the decimal points
- 18.2 + 19.1 = 37.3
2.
30.4
−17.3
Answer: 13.1
- Line up the decimal points
- 30.4 − 17.3 = 13.1
3.
39.8
−8.8
Answer: 31.0
- Line up the decimal points
- 39.8 − 8.8 = 31.0
4.
15.0
+19.9
Answer: 34.9
- Line up the decimal points
- 15.0 + 19.9 = 34.9
5.
37.8
−17.3
Answer: 20.5
- Line up the decimal points
- 37.8 − 17.3 = 20.5
6.
4.8
−3.1
Answer: 1.7
- Line up the decimal points
- 4.8 − 3.1 = 1.7
7.
26.1
−5.0
Answer: 21.1
- Line up the decimal points
- 26.1 − 5.0 = 21.1
8.
38.7
−30.1
Answer: 8.6
- Line up the decimal points
- 38.7 − 30.1 = 8.6
9.
53.9
+15.2
Answer: 69.1
- Line up the decimal points
- 53.9 + 15.2 = 69.1
10.
7.2
+8.6
Answer: 15.8
- Line up the decimal points
- 7.2 + 8.6 = 15.8
11.
23.5
+5.4
Answer: 28.9
- Line up the decimal points
- 23.5 + 5.4 = 28.9
12.
15.1
+3.3
Answer: 18.4
- Line up the decimal points
- 15.1 + 3.3 = 18.4
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.