1st Grade Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 3 — Answers
Answer sheet with worked solutions for the 1st Grade addition worksheet.
Success TutoringWorksheetsAnswer sheet1st Grade · Mathematics · Addition1st Grade Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 3 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) + 14 = 16
Answer: 2
- 16 − 14 = 2
2. (answer space) + 2 = 7
Answer: 5
- 7 − 2 = 5
3.3 + (answer space) = 6
Answer: 3
- 6 − 3 = 3
4.3 + (answer space) = 9
Answer: 6
- 9 − 3 = 6
5.13 − (answer space) = 12
Answer: 1
- 13 − 12 = 1
6.8 − (answer space) = 2
Answer: 6
- 8 − 2 = 6
7. (answer space) − 7 = 1
Answer: 8
- 1 + 7 = 8
8.6 − (answer space) = 5
Answer: 1
- 6 − 5 = 1
9.12 − (answer space) = 6
Answer: 6
- 12 − 6 = 6
10. (answer space) + 1 = 16
Answer: 15
- 16 − 1 = 15
11.12 − (answer space) = 7
Answer: 5
- 12 − 7 = 5
12. (answer space) − 5 = 8
Answer: 13
- 8 + 5 = 13
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.