3rd Grade Missing Numbers in Number Sentences Worksheet — Level 2 — Answers
Answer sheet with worked solutions for the 3rd Grade addition worksheet.
Success TutoringWorksheetsAnswer sheet3rd Grade · Mathematics · Addition3rd Grade Missing Numbers in Number Sentences Worksheet — Level 2 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) + 39 = 79
Answer: 40
- 79 − 39 = 40
2.79 − (answer space) = 78
Answer: 1
- 79 − 78 = 1
3. (answer space) − 2 = 38
Answer: 40
- 38 + 2 = 40
4.61 − (answer space) = 50
Answer: 11
- 61 − 50 = 11
5. (answer space) − 42 = 30
Answer: 72
- 30 + 42 = 72
6.79 − (answer space) = 27
Answer: 52
- 79 − 27 = 52
7. (answer space) + 3 = 87
Answer: 84
- 87 − 3 = 84
8.10 + (answer space) = 48
Answer: 38
- 48 − 10 = 38
9.61 + (answer space) = 82
Answer: 21
- 82 − 61 = 21
10.83 − (answer space) = 46
Answer: 37
- 83 − 46 = 37
11.27 − (answer space) = 4
Answer: 23
- 27 − 4 = 23
12.48 + (answer space) = 82
Answer: 34
- 82 − 48 = 34
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.