4th Grade Mental Addition and Subtraction Strategies Worksheet — Level 2 — 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 — Answers
Fill in each step of the strategy, then write the answer.
1.45 + 9 = 45 + 5 + (answer space) = (answer space)
Answer: 4, 54
- 45 + 5 = 50 (a ten)
- 50 + 4 = 54
2.37 + 9 = 37 + 10 − (answer space) = (answer space)
Answer: 1, 46
- 37 + 10 = 47
- 47 − 1 = 46
3.33 + 34 = (answer space) + (answer space) + 1 = (answer space)
Answer: 33, 33, 67
- Double 33 is 66
- 66 + 1 = 67
4.86 + 5 = 86 + 4 + (answer space) = (answer space)
Answer: 1, 91
- 86 + 4 = 90 (a ten)
- 90 + 1 = 91
5.83 + 9 = 83 + 10 − (answer space) = (answer space)
Answer: 1, 92
- 83 + 10 = 93
- 93 − 1 = 92
6.47 + 48 = (answer space) + (answer space) + 1 = (answer space)
Answer: 47, 47, 95
- Double 47 is 94
- 94 + 1 = 95
7.19 + 9 = 19 + 1 + (answer space) = (answer space)
Answer: 8, 28
- 19 + 1 = 20 (a ten)
- 20 + 8 = 28
8.12 + 9 = 12 + 10 − (answer space) = (answer space)
Answer: 1, 21
- 12 + 10 = 22
- 22 − 1 = 21
9.44 + 45 = (answer space) + (answer space) + 1 = (answer space)
Answer: 44, 44, 89
- Double 44 is 88
- 88 + 1 = 89
10.18 + 8 = 18 + 2 + (answer space) = (answer space)
Answer: 6, 26
- 18 + 2 = 20 (a ten)
- 20 + 6 = 26
11.22 + 9 = 22 + 10 − (answer space) = (answer space)
Answer: 1, 31
- 22 + 10 = 32
- 32 − 1 = 31
12.48 + 49 = (answer space) + (answer space) + 1 = (answer space)
Answer: 48, 48, 97
- Double 48 is 96
- 96 + 1 = 97
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.