Year 4 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 4 — 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 4 — Answers
Fill in each step of the strategy, then write the answer.
1.35 + 7 = 35 + 5 + (answer space) = (answer space)
Answer: 2, 42
- 35 + 5 = 40 (a ten)
- 40 + 2 = 42
2.14 + 9 = 14 + 10 − (answer space) = (answer space)
Answer: 1, 23
- 14 + 10 = 24
- 24 − 1 = 23
3.23 + 24 = (answer space) + (answer space) + 1 = (answer space)
Answer: 23, 23, 47
- Double 23 is 46
- 46 + 1 = 47
4.37 + 8 = 37 + 3 + (answer space) = (answer space)
Answer: 5, 45
- 37 + 3 = 40 (a ten)
- 40 + 5 = 45
5.65 + 9 = 65 + 10 − (answer space) = (answer space)
Answer: 1, 74
- 65 + 10 = 75
- 75 − 1 = 74
6.15 + 16 = (answer space) + (answer space) + 1 = (answer space)
Answer: 15, 15, 31
- Double 15 is 30
- 30 + 1 = 31
7.69 + 6 = 69 + 1 + (answer space) = (answer space)
Answer: 5, 75
- 69 + 1 = 70 (a ten)
- 70 + 5 = 75
8.30 + 9 = 30 + 10 − (answer space) = (answer space)
Answer: 1, 39
- 30 + 10 = 40
- 40 − 1 = 39
9.63 + 62 = (answer space) + (answer space) + 1 = (answer space)
Answer: 62, 62, 125
- Double 62 is 124
- 124 + 1 = 125
10.46 + 5 = 46 + 4 + (answer space) = (answer space)
Answer: 1, 51
- 46 + 4 = 50 (a ten)
- 50 + 1 = 51
11.50 + 9 = 50 + 10 − (answer space) = (answer space)
Answer: 1, 59
- 50 + 10 = 60
- 60 − 1 = 59
12.72 + 71 = (answer space) + (answer space) + 1 = (answer space)
Answer: 71, 71, 143
- Double 71 is 142
- 142 + 1 = 143
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.