3rd Grade Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 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 1 — Practice Set 2 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) + 1 = 12
Answer: 11
- 12 − 1 = 11
2.13 + (answer space) = 18
Answer: 5
- 18 − 13 = 5
3.5 + (answer space) = 10
Answer: 5
- 10 − 5 = 5
4.10 − (answer space) = 2
Answer: 8
- 10 − 2 = 8
5. (answer space) − 4 = 13
Answer: 17
- 13 + 4 = 17
6.3 + (answer space) = 9
Answer: 6
- 9 − 3 = 6
7. (answer space) + 4 = 19
Answer: 15
- 19 − 4 = 15
8.7 + (answer space) = 18
Answer: 11
- 18 − 7 = 11
9.13 − (answer space) = 11
Answer: 2
- 13 − 11 = 2
10.15 − (answer space) = 1
Answer: 14
- 15 − 1 = 14
11.19 − (answer space) = 5
Answer: 14
- 19 − 5 = 14
12.12 − (answer space) = 6
Answer: 6
- 12 − 6 = 6
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.