Year 4 Adding and Subtracting Decimals Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 4 decimals worksheet.
Year 4 Adding and Subtracting Decimals Worksheet — Level 1 — Answers
Line up the decimal points before you add or subtract.
1.
17.8
+13.3
Answer: 31.1
- Line up the decimal points
- 17.8 + 13.3 = 31.1
2.
43.3
−24.9
Answer: 18.4
- Line up the decimal points
- 43.3 − 24.9 = 18.4
3.
22.9
−20.7
Answer: 2.2
- Line up the decimal points
- 22.9 − 20.7 = 2.2
4.
39.3
−7.8
Answer: 31.5
- Line up the decimal points
- 39.3 − 7.8 = 31.5
5.
33.5
−20.6
Answer: 12.9
- Line up the decimal points
- 33.5 − 20.6 = 12.9
6.
32.5
−3.9
Answer: 28.6
- Line up the decimal points
- 32.5 − 3.9 = 28.6
7.
21.8
+9.2
Answer: 31.0
- Line up the decimal points
- 21.8 + 9.2 = 31.0
8.
16.9
−4.5
Answer: 12.4
- Line up the decimal points
- 16.9 − 4.5 = 12.4
9.
37.2
−30.0
Answer: 7.2
- Line up the decimal points
- 37.2 − 30.0 = 7.2
10.
40.9
−36.1
Answer: 4.8
- Line up the decimal points
- 40.9 − 36.1 = 4.8
11.
8.8
+24.5
Answer: 33.3
- Line up the decimal points
- 8.8 + 24.5 = 33.3
12.
55.8
+10.7
Answer: 66.5
- Line up the decimal points
- 55.8 + 10.7 = 66.5
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.