4th Grade Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 4 — 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 4 — Answers
Fill in each step of the strategy, then write the answer.
1.17 + 9 = 17 + 3 + (answer space) = (answer space)
Answer: 6, 26
- 17 + 3 = 20 (a ten)
- 20 + 6 = 26
2.23 + 9 = 23 + 10 − (answer space) = (answer space)
Answer: 1, 32
- 23 + 10 = 33
- 33 − 1 = 32
3.64 + 63 = (answer space) + (answer space) + 1 = (answer space)
Answer: 63, 63, 127
- Double 63 is 126
- 126 + 1 = 127
4.65 + 6 = 65 + 5 + (answer space) = (answer space)
Answer: 1, 71
- 65 + 5 = 70 (a ten)
- 70 + 1 = 71
5.53 + 9 = 53 + 10 − (answer space) = (answer space)
Answer: 1, 62
- 53 + 10 = 63
- 63 − 1 = 62
6.27 + 28 = (answer space) + (answer space) + 1 = (answer space)
Answer: 27, 27, 55
- Double 27 is 54
- 54 + 1 = 55
7.78 + 5 = 78 + 2 + (answer space) = (answer space)
Answer: 3, 83
- 78 + 2 = 80 (a ten)
- 80 + 3 = 83
8.49 + 9 = 49 + 10 − (answer space) = (answer space)
Answer: 1, 58
- 49 + 10 = 59
- 59 − 1 = 58
9.83 + 84 = (answer space) + (answer space) + 1 = (answer space)
Answer: 83, 83, 167
- Double 83 is 166
- 166 + 1 = 167
10.29 + 8 = 29 + 1 + (answer space) = (answer space)
Answer: 7, 37
- 29 + 1 = 30 (a ten)
- 30 + 7 = 37
11.66 + 9 = 66 + 10 − (answer space) = (answer space)
Answer: 1, 75
- 66 + 10 = 76
- 76 − 1 = 75
12.32 + 33 = (answer space) + (answer space) + 1 = (answer space)
Answer: 32, 32, 65
- Double 32 is 64
- 64 + 1 = 65
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.