Year 7 Adding and Subtracting Decimals Worksheet — Level 3 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 7 decimals worksheet.
Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · DecimalsYear 7 Adding and Subtracting Decimals Worksheet — Level 3 — Practice Set 3 — Answers
Line up the decimal points before you add or subtract.
1.
128.62
−75.49
Answer: 53.13
- Line up the decimal points
- 128.62 − 75.49 = 53.13
2.
231.05
−151.38
Answer: 79.67
- Line up the decimal points
- 231.05 − 151.38 = 79.67
3.
336.18
+31.78
Answer: 367.96
- Line up the decimal points
- 336.18 + 31.78 = 367.96
4.
7.31
+98.38
Answer: 105.69
- Line up the decimal points
- 7.31 + 98.38 = 105.69
5.
138.58
+130.84
Answer: 269.42
- Line up the decimal points
- 138.58 + 130.84 = 269.42
6.
297.76
−121.58
Answer: 176.18
- Line up the decimal points
- 297.76 − 121.58 = 176.18
7.
291.60
+7.50
Answer: 299.10
- Line up the decimal points
- 291.60 + 7.50 = 299.10
8.
14.91
+153.57
Answer: 168.48
- Line up the decimal points
- 14.91 + 153.57 = 168.48
9.
229.38
−160.64
Answer: 68.74
- Line up the decimal points
- 229.38 − 160.64 = 68.74
10.
153.87
+115.33
Answer: 269.20
- Line up the decimal points
- 153.87 + 115.33 = 269.20
11.
74.44
+127.27
Answer: 201.71
- Line up the decimal points
- 74.44 + 127.27 = 201.71
12.
37.35
+71.84
Answer: 109.19
- Line up the decimal points
- 37.35 + 71.84 = 109.19
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.