3rd Grade Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 4 — 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 1 — Practice Set 4 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) − 7 = 7
Answer: 14
- 7 + 7 = 14
2.2 + (answer space) = 17
Answer: 15
- 17 − 2 = 15
3.7 − (answer space) = 6
Answer: 1
- 7 − 6 = 1
4.1 + (answer space) = 15
Answer: 14
- 15 − 1 = 14
5.5 − (answer space) = 4
Answer: 1
- 5 − 4 = 1
6.2 + (answer space) = 5
Answer: 3
- 5 − 2 = 3
7. (answer space) + 1 = 11
Answer: 10
- 11 − 1 = 10
8. (answer space) + 5 = 12
Answer: 7
- 12 − 5 = 7
9. (answer space) − 1 = 5
Answer: 6
- 5 + 1 = 6
10. (answer space) + 3 = 10
Answer: 7
- 10 − 3 = 7
11.6 + (answer space) = 13
Answer: 7
- 13 − 6 = 7
12. (answer space) + 10 = 20
Answer: 10
- 20 − 10 = 10
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.