Year 4 Adding and Subtracting Decimals Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 4 decimals worksheet.
Year 4 Adding and Subtracting Decimals Worksheet — Level 1 — Practice Set 4 — Answers
Line up the decimal points before you add or subtract.
1.
29.6
+20.8
Answer: 50.4
- Line up the decimal points
- 29.6 + 20.8 = 50.4
2.
12.2
+2.1
Answer: 14.3
- Line up the decimal points
- 12.2 + 2.1 = 14.3
3.
39.6
+40.0
Answer: 79.6
- Line up the decimal points
- 39.6 + 40.0 = 79.6
4.
49.0
+4.0
Answer: 53.0
- Line up the decimal points
- 49.0 + 4.0 = 53.0
5.
34.1
+19.2
Answer: 53.3
- Line up the decimal points
- 34.1 + 19.2 = 53.3
6.
46.2
−27.7
Answer: 18.5
- Line up the decimal points
- 46.2 − 27.7 = 18.5
7.
40.5
+35.4
Answer: 75.9
- Line up the decimal points
- 40.5 + 35.4 = 75.9
8.
51.4
−10.8
Answer: 40.6
- Line up the decimal points
- 51.4 − 10.8 = 40.6
9.
40.0
+33.4
Answer: 73.4
- Line up the decimal points
- 40.0 + 33.4 = 73.4
10.
24.3
+29.3
Answer: 53.6
- Line up the decimal points
- 24.3 + 29.3 = 53.6
11.
52.0
−36.9
Answer: 15.1
- Line up the decimal points
- 52.0 − 36.9 = 15.1
12.
36.3
+31.7
Answer: 68.0
- Line up the decimal points
- 36.3 + 31.7 = 68.0
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.