Year 2 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Answer sheet with worked solutions for the Year 2 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 2 · Mathematics · AdditionYear 2 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Fill in each step of the strategy, then write the answer.
1.39 + 2 = 39 + 1 + (answer space) = (answer space)
Answer: 1, 41
- 39 + 1 = 40 (a ten)
- 40 + 1 = 41
2.30 + 9 = 30 + 10 − (answer space) = (answer space)
Answer: 1, 39
- 30 + 10 = 40
- 40 − 1 = 39
3.31 + 32 = (answer space) + (answer space) + 1 = (answer space)
Answer: 31, 31, 63
- Double 31 is 62
- 62 + 1 = 63
4.79 + 3 = 79 + 1 + (answer space) = (answer space)
Answer: 2, 82
- 79 + 1 = 80 (a ten)
- 80 + 2 = 82
5.79 + 9 = 79 + 10 − (answer space) = (answer space)
Answer: 1, 88
- 79 + 10 = 89
- 89 − 1 = 88
6.41 + 42 = (answer space) + (answer space) + 1 = (answer space)
Answer: 41, 41, 83
- Double 41 is 82
- 82 + 1 = 83
7.57 + 6 = 57 + 3 + (answer space) = (answer space)
Answer: 3, 63
- 57 + 3 = 60 (a ten)
- 60 + 3 = 63
8.76 + 9 = 76 + 10 − (answer space) = (answer space)
Answer: 1, 85
- 76 + 10 = 86
- 86 − 1 = 85
9.42 + 41 = (answer space) + (answer space) + 1 = (answer space)
Answer: 41, 41, 83
- Double 41 is 82
- 82 + 1 = 83
10.65 + 6 = 65 + 5 + (answer space) = (answer space)
Answer: 1, 71
- 65 + 5 = 70 (a ten)
- 70 + 1 = 71
11.49 + 9 = 49 + 10 − (answer space) = (answer space)
Answer: 1, 58
- 49 + 10 = 59
- 59 − 1 = 58
12.74 + 73 = (answer space) + (answer space) + 1 = (answer space)
Answer: 73, 73, 147
- Double 73 is 146
- 146 + 1 = 147
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.