4th Grade Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 3 — Answers
Answer sheet with worked solutions for the 4th Grade addition worksheet.
Success TutoringWorksheetsAnswer sheet4th Grade · Mathematics · Addition4th Grade Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 3 — Answers
Fill in each step of the strategy, then write the answer.
1.28 + 3 = 28 + 2 + (answer space) = (answer space)
Answer: 1, 31
- 28 + 2 = 30 (a ten)
- 30 + 1 = 31
2.43 + 9 = 43 + 10 − (answer space) = (answer space)
Answer: 1, 52
- 43 + 10 = 53
- 53 − 1 = 52
3.63 + 62 = (answer space) + (answer space) + 1 = (answer space)
Answer: 62, 62, 125
- Double 62 is 124
- 124 + 1 = 125
4.35 + 6 = 35 + 5 + (answer space) = (answer space)
Answer: 1, 41
- 35 + 5 = 40 (a ten)
- 40 + 1 = 41
5.37 + 9 = 37 + 10 − (answer space) = (answer space)
Answer: 1, 46
- 37 + 10 = 47
- 47 − 1 = 46
6.18 + 19 = (answer space) + (answer space) + 1 = (answer space)
Answer: 18, 18, 37
- Double 18 is 36
- 36 + 1 = 37
7.16 + 8 = 16 + 4 + (answer space) = (answer space)
Answer: 4, 24
- 16 + 4 = 20 (a ten)
- 20 + 4 = 24
8.58 + 9 = 58 + 10 − (answer space) = (answer space)
Answer: 1, 67
- 58 + 10 = 68
- 68 − 1 = 67
9.30 + 29 = (answer space) + (answer space) + 1 = (answer space)
Answer: 29, 29, 59
- Double 29 is 58
- 58 + 1 = 59
10.89 + 3 = 89 + 1 + (answer space) = (answer space)
Answer: 2, 92
- 89 + 1 = 90 (a ten)
- 90 + 2 = 92
11.42 + 9 = 42 + 10 − (answer space) = (answer space)
Answer: 1, 51
- 42 + 10 = 52
- 52 − 1 = 51
12.84 + 83 = (answer space) + (answer space) + 1 = (answer space)
Answer: 83, 83, 167
- Double 83 is 166
- 166 + 1 = 167
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.