Year 3 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Answer sheet with worked solutions for the Year 3 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · AdditionYear 3 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Fill in each step of the strategy, then write the answer.
1.18 + 6 = 18 + 2 + (answer space) = (answer space)
Answer: 4, 24
- 18 + 2 = 20 (a ten)
- 20 + 4 = 24
2.83 + 9 = 83 + 10 − (answer space) = (answer space)
Answer: 1, 92
- 83 + 10 = 93
- 93 − 1 = 92
3.70 + 71 = (answer space) + (answer space) + 1 = (answer space)
Answer: 70, 70, 141
- Double 70 is 140
- 140 + 1 = 141
4.18 + 8 = 18 + 2 + (answer space) = (answer space)
Answer: 6, 26
- 18 + 2 = 20 (a ten)
- 20 + 6 = 26
5.32 + 9 = 32 + 10 − (answer space) = (answer space)
Answer: 1, 41
- 32 + 10 = 42
- 42 − 1 = 41
6.84 + 83 = (answer space) + (answer space) + 1 = (answer space)
Answer: 83, 83, 167
- Double 83 is 166
- 166 + 1 = 167
7.86 + 7 = 86 + 4 + (answer space) = (answer space)
Answer: 3, 93
- 86 + 4 = 90 (a ten)
- 90 + 3 = 93
8.27 + 9 = 27 + 10 − (answer space) = (answer space)
Answer: 1, 36
- 27 + 10 = 37
- 37 − 1 = 36
9.23 + 22 = (answer space) + (answer space) + 1 = (answer space)
Answer: 22, 22, 45
- Double 22 is 44
- 44 + 1 = 45
10.26 + 8 = 26 + 4 + (answer space) = (answer space)
Answer: 4, 34
- 26 + 4 = 30 (a ten)
- 30 + 4 = 34
11.18 + 9 = 18 + 10 − (answer space) = (answer space)
Answer: 1, 27
- 18 + 10 = 28
- 28 − 1 = 27
12.41 + 42 = (answer space) + (answer space) + 1 = (answer space)
Answer: 41, 41, 83
- Double 41 is 82
- 82 + 1 = 83
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.