2nd Grade Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Answer sheet with worked solutions for the 2nd Grade addition worksheet.
Success TutoringWorksheetsAnswer sheet2nd Grade · Mathematics · Addition2nd Grade Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Fill in each step of the strategy, then write the answer.
1.46 + 9 = 46 + 4 + (answer space) = (answer space)
Answer: 5, 55
- 46 + 4 = 50 (a ten)
- 50 + 5 = 55
2.64 + 9 = 64 + 10 − (answer space) = (answer space)
Answer: 1, 73
- 64 + 10 = 74
- 74 − 1 = 73
3.21 + 20 = (answer space) + (answer space) + 1 = (answer space)
Answer: 20, 20, 41
- Double 20 is 40
- 40 + 1 = 41
4.68 + 8 = 68 + 2 + (answer space) = (answer space)
Answer: 6, 76
- 68 + 2 = 70 (a ten)
- 70 + 6 = 76
5.88 + 9 = 88 + 10 − (answer space) = (answer space)
Answer: 1, 97
- 88 + 10 = 98
- 98 − 1 = 97
6.17 + 18 = (answer space) + (answer space) + 1 = (answer space)
Answer: 17, 17, 35
- Double 17 is 34
- 34 + 1 = 35
7.89 + 2 = 89 + 1 + (answer space) = (answer space)
Answer: 1, 91
- 89 + 1 = 90 (a ten)
- 90 + 1 = 91
8.84 + 9 = 84 + 10 − (answer space) = (answer space)
Answer: 1, 93
- 84 + 10 = 94
- 94 − 1 = 93
9.40 + 41 = (answer space) + (answer space) + 1 = (answer space)
Answer: 40, 40, 81
- Double 40 is 80
- 80 + 1 = 81
10.79 + 7 = 79 + 1 + (answer space) = (answer space)
Answer: 6, 86
- 79 + 1 = 80 (a ten)
- 80 + 6 = 86
11.70 + 9 = 70 + 10 − (answer space) = (answer space)
Answer: 1, 79
- 70 + 10 = 80
- 80 − 1 = 79
12.20 + 21 = (answer space) + (answer space) + 1 = (answer space)
Answer: 20, 20, 41
- Double 20 is 40
- 40 + 1 = 41
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.