4th Grade Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 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 — Practice Set 2 — Answers
Fill in each step of the strategy, then write the answer.
1.59 + 6 = 59 + 1 + (answer space) = (answer space)
Answer: 5, 65
- 59 + 1 = 60 (a ten)
- 60 + 5 = 65
2.20 + 9 = 20 + 10 − (answer space) = (answer space)
Answer: 1, 29
- 20 + 10 = 30
- 30 − 1 = 29
3.51 + 50 = (answer space) + (answer space) + 1 = (answer space)
Answer: 50, 50, 101
- Double 50 is 100
- 100 + 1 = 101
4.15 + 6 = 15 + 5 + (answer space) = (answer space)
Answer: 1, 21
- 15 + 5 = 20 (a ten)
- 20 + 1 = 21
5.34 + 9 = 34 + 10 − (answer space) = (answer space)
Answer: 1, 43
- 34 + 10 = 44
- 44 − 1 = 43
6.26 + 25 = (answer space) + (answer space) + 1 = (answer space)
Answer: 25, 25, 51
- Double 25 is 50
- 50 + 1 = 51
7.46 + 6 = 46 + 4 + (answer space) = (answer space)
Answer: 2, 52
- 46 + 4 = 50 (a ten)
- 50 + 2 = 52
8.68 + 9 = 68 + 10 − (answer space) = (answer space)
Answer: 1, 77
- 68 + 10 = 78
- 78 − 1 = 77
9.16 + 17 = (answer space) + (answer space) + 1 = (answer space)
Answer: 16, 16, 33
- Double 16 is 32
- 32 + 1 = 33
10.37 + 4 = 37 + 3 + (answer space) = (answer space)
Answer: 1, 41
- 37 + 3 = 40 (a ten)
- 40 + 1 = 41
11.27 + 9 = 27 + 10 − (answer space) = (answer space)
Answer: 1, 36
- 27 + 10 = 37
- 37 − 1 = 36
12.11 + 10 = (answer space) + (answer space) + 1 = (answer space)
Answer: 10, 10, 21
- Double 10 is 20
- 20 + 1 = 21
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.