Year 4 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 2 — Answers
Answer sheet with worked solutions for the Year 4 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · AdditionYear 4 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 2 — Answers
Fill in each step of the strategy, then write the answer.
1.46 + 7 = 46 + 4 + (answer space) = (answer space)
Answer: 3, 53
- 46 + 4 = 50 (a ten)
- 50 + 3 = 53
2.53 + 9 = 53 + 10 − (answer space) = (answer space)
Answer: 1, 62
- 53 + 10 = 63
- 63 − 1 = 62
3.54 + 53 = (answer space) + (answer space) + 1 = (answer space)
Answer: 53, 53, 107
- Double 53 is 106
- 106 + 1 = 107
4.86 + 8 = 86 + 4 + (answer space) = (answer space)
Answer: 4, 94
- 86 + 4 = 90 (a ten)
- 90 + 4 = 94
5.72 + 9 = 72 + 10 − (answer space) = (answer space)
Answer: 1, 81
- 72 + 10 = 82
- 82 − 1 = 81
6.15 + 14 = (answer space) + (answer space) + 1 = (answer space)
Answer: 14, 14, 29
- Double 14 is 28
- 28 + 1 = 29
7.79 + 4 = 79 + 1 + (answer space) = (answer space)
Answer: 3, 83
- 79 + 1 = 80 (a ten)
- 80 + 3 = 83
8.35 + 9 = 35 + 10 − (answer space) = (answer space)
Answer: 1, 44
- 35 + 10 = 45
- 45 − 1 = 44
9.26 + 27 = (answer space) + (answer space) + 1 = (answer space)
Answer: 26, 26, 53
- Double 26 is 52
- 52 + 1 = 53
10.38 + 7 = 38 + 2 + (answer space) = (answer space)
Answer: 5, 45
- 38 + 2 = 40 (a ten)
- 40 + 5 = 45
11.89 + 9 = 89 + 10 − (answer space) = (answer space)
Answer: 1, 98
- 89 + 10 = 99
- 99 − 1 = 98
12.13 + 14 = (answer space) + (answer space) + 1 = (answer space)
Answer: 13, 13, 27
- Double 13 is 26
- 26 + 1 = 27
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.