Year 8 Adding and Subtracting Decimals Worksheet — Level 3 — Answers
Answer sheet with worked solutions for the Year 8 decimals worksheet.
Year 8 Adding and Subtracting Decimals Worksheet — Level 3 — Answers
Line up the decimal points before you add or subtract.
1.
281.23
−118.01
Answer: 163.22
- Line up the decimal points
- 281.23 − 118.01 = 163.22
2.
187.45
−57.09
Answer: 130.36
- Line up the decimal points
- 187.45 − 57.09 = 130.36
3.
109.26
−5.25
Answer: 104.01
- Line up the decimal points
- 109.26 − 5.25 = 104.01
4.
90.55
+126.95
Answer: 217.50
- Line up the decimal points
- 90.55 + 126.95 = 217.50
5.
260.87
+99.16
Answer: 360.03
- Line up the decimal points
- 260.87 + 99.16 = 360.03
6.
190.39
+87.88
Answer: 278.27
- Line up the decimal points
- 190.39 + 87.88 = 278.27
7.
341.03
−114.49
Answer: 226.54
- Line up the decimal points
- 341.03 − 114.49 = 226.54
8.
191.75
−93.95
Answer: 97.80
- Line up the decimal points
- 191.75 − 93.95 = 97.80
9.
274.26
+141.44
Answer: 415.70
- Line up the decimal points
- 274.26 + 141.44 = 415.70
10.
55.88
−51.70
Answer: 4.18
- Line up the decimal points
- 55.88 − 51.70 = 4.18
11.
400.37
+152.03
Answer: 552.40
- Line up the decimal points
- 400.37 + 152.03 = 552.40
12.
95.24
+176.09
Answer: 271.33
- Line up the decimal points
- 95.24 + 176.09 = 271.33
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.