2nd Grade Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 4 — 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 4 — Answers
Fill in each step of the strategy, then write the answer.
1.67 + 5 = 67 + 3 + (answer space) = (answer space)
Answer: 2, 72
- 67 + 3 = 70 (a ten)
- 70 + 2 = 72
2.13 + 9 = 13 + 10 − (answer space) = (answer space)
Answer: 1, 22
- 13 + 10 = 23
- 23 − 1 = 22
3.14 + 13 = (answer space) + (answer space) + 1 = (answer space)
Answer: 13, 13, 27
- Double 13 is 26
- 26 + 1 = 27
4.25 + 8 = 25 + 5 + (answer space) = (answer space)
Answer: 3, 33
- 25 + 5 = 30 (a ten)
- 30 + 3 = 33
5.17 + 9 = 17 + 10 − (answer space) = (answer space)
Answer: 1, 26
- 17 + 10 = 27
- 27 − 1 = 26
6.46 + 45 = (answer space) + (answer space) + 1 = (answer space)
Answer: 45, 45, 91
- Double 45 is 90
- 90 + 1 = 91
7.76 + 6 = 76 + 4 + (answer space) = (answer space)
Answer: 2, 82
- 76 + 4 = 80 (a ten)
- 80 + 2 = 82
8.58 + 9 = 58 + 10 − (answer space) = (answer space)
Answer: 1, 67
- 58 + 10 = 68
- 68 − 1 = 67
9.24 + 23 = (answer space) + (answer space) + 1 = (answer space)
Answer: 23, 23, 47
- Double 23 is 46
- 46 + 1 = 47
10.49 + 2 = 49 + 1 + (answer space) = (answer space)
Answer: 1, 51
- 49 + 1 = 50 (a ten)
- 50 + 1 = 51
11.82 + 9 = 82 + 10 − (answer space) = (answer space)
Answer: 1, 91
- 82 + 10 = 92
- 92 − 1 = 91
12.54 + 55 = (answer space) + (answer space) + 1 = (answer space)
Answer: 54, 54, 109
- Double 54 is 108
- 108 + 1 = 109
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.