Year 8 Adding and Subtracting Decimals Worksheet — Level 1 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 8 decimals worksheet.
Success TutoringWorksheetsAnswer sheetYear 8 · Mathematics · DecimalsYear 8 Adding and Subtracting Decimals Worksheet — Level 1 — Practice Set 3 — Answers
Line up the decimal points before you add or subtract.
1.
58.9
+15.0
Answer: 73.9
- Line up the decimal points
- 58.9 + 15.0 = 73.9
2.
52.5
−39.5
Answer: 13.0
- Line up the decimal points
- 52.5 − 39.5 = 13.0
3.
46.0
+18.6
Answer: 64.6
- Line up the decimal points
- 46.0 + 18.6 = 64.6
4.
44.7
+7.7
Answer: 52.4
- Line up the decimal points
- 44.7 + 7.7 = 52.4
5.
51.1
−29.0
Answer: 22.1
- Line up the decimal points
- 51.1 − 29.0 = 22.1
6.
20.3
+7.3
Answer: 27.6
- Line up the decimal points
- 20.3 + 7.3 = 27.6
7.
47.0
+35.9
Answer: 82.9
- Line up the decimal points
- 47.0 + 35.9 = 82.9
8.
4.5
+1.6
Answer: 6.1
- Line up the decimal points
- 4.5 + 1.6 = 6.1
9.
58.7
−24.1
Answer: 34.6
- Line up the decimal points
- 58.7 − 24.1 = 34.6
10.
16.9
+3.0
Answer: 19.9
- Line up the decimal points
- 16.9 + 3.0 = 19.9
11.
23.7
+1.7
Answer: 25.4
- Line up the decimal points
- 23.7 + 1.7 = 25.4
12.
31.9
+31.6
Answer: 63.5
- Line up the decimal points
- 31.9 + 31.6 = 63.5
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.