2nd Grade Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 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 — Practice Set 2 — Answers
Fill in each step of the strategy, then write the answer.
1.18 + 6 = 18 + 2 + (answer space) = (answer space)
Answer: 4, 24
- 18 + 2 = 20 (a ten)
- 20 + 4 = 24
2.53 + 9 = 53 + 10 − (answer space) = (answer space)
Answer: 1, 62
- 53 + 10 = 63
- 63 − 1 = 62
3.64 + 65 = (answer space) + (answer space) + 1 = (answer space)
Answer: 64, 64, 129
- Double 64 is 128
- 128 + 1 = 129
4.49 + 8 = 49 + 1 + (answer space) = (answer space)
Answer: 7, 57
- 49 + 1 = 50 (a ten)
- 50 + 7 = 57
5.70 + 9 = 70 + 10 − (answer space) = (answer space)
Answer: 1, 79
- 70 + 10 = 80
- 80 − 1 = 79
6.23 + 22 = (answer space) + (answer space) + 1 = (answer space)
Answer: 22, 22, 45
- Double 22 is 44
- 44 + 1 = 45
7.67 + 4 = 67 + 3 + (answer space) = (answer space)
Answer: 1, 71
- 67 + 3 = 70 (a ten)
- 70 + 1 = 71
8.23 + 9 = 23 + 10 − (answer space) = (answer space)
Answer: 1, 32
- 23 + 10 = 33
- 33 − 1 = 32
9.27 + 26 = (answer space) + (answer space) + 1 = (answer space)
Answer: 26, 26, 53
- Double 26 is 52
- 52 + 1 = 53
10.59 + 6 = 59 + 1 + (answer space) = (answer space)
Answer: 5, 65
- 59 + 1 = 60 (a ten)
- 60 + 5 = 65
11.65 + 9 = 65 + 10 − (answer space) = (answer space)
Answer: 1, 74
- 65 + 10 = 75
- 75 − 1 = 74
12.83 + 84 = (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.