Year 2 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 3 — 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 — Practice Set 3 — Answers
Fill in each step of the strategy, then write the answer.
1.17 + 4 = 17 + 3 + (answer space) = (answer space)
Answer: 1, 21
- 17 + 3 = 20 (a ten)
- 20 + 1 = 21
2.71 + 9 = 71 + 10 − (answer space) = (answer space)
Answer: 1, 80
- 71 + 10 = 81
- 81 − 1 = 80
3.14 + 13 = (answer space) + (answer space) + 1 = (answer space)
Answer: 13, 13, 27
- Double 13 is 26
- 26 + 1 = 27
4.57 + 7 = 57 + 3 + (answer space) = (answer space)
Answer: 4, 64
- 57 + 3 = 60 (a ten)
- 60 + 4 = 64
5.49 + 9 = 49 + 10 − (answer space) = (answer space)
Answer: 1, 58
- 49 + 10 = 59
- 59 − 1 = 58
6.18 + 19 = (answer space) + (answer space) + 1 = (answer space)
Answer: 18, 18, 37
- Double 18 is 36
- 36 + 1 = 37
7.56 + 8 = 56 + 4 + (answer space) = (answer space)
Answer: 4, 64
- 56 + 4 = 60 (a ten)
- 60 + 4 = 64
8.82 + 9 = 82 + 10 − (answer space) = (answer space)
Answer: 1, 91
- 82 + 10 = 92
- 92 − 1 = 91
9.73 + 74 = (answer space) + (answer space) + 1 = (answer space)
Answer: 73, 73, 147
- Double 73 is 146
- 146 + 1 = 147
10.88 + 7 = 88 + 2 + (answer space) = (answer space)
Answer: 5, 95
- 88 + 2 = 90 (a ten)
- 90 + 5 = 95
11.31 + 9 = 31 + 10 − (answer space) = (answer space)
Answer: 1, 40
- 31 + 10 = 41
- 41 − 1 = 40
12.36 + 37 = (answer space) + (answer space) + 1 = (answer space)
Answer: 36, 36, 73
- Double 36 is 72
- 72 + 1 = 73
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.