1st Grade Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 2 — 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 2 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1.9 + (answer space) = 19
Answer: 10
- 19 − 9 = 10
2.12 − (answer space) = 3
Answer: 9
- 12 − 3 = 9
3. (answer space) − 6 = 8
Answer: 14
- 8 + 6 = 14
4.5 − (answer space) = 2
Answer: 3
- 5 − 2 = 3
5.17 − (answer space) = 16
Answer: 1
- 17 − 16 = 1
6. (answer space) + 14 = 19
Answer: 5
- 19 − 14 = 5
7. (answer space) + 16 = 19
Answer: 3
- 19 − 16 = 3
8. (answer space) − 1 = 10
Answer: 11
- 10 + 1 = 11
9. (answer space) + 8 = 15
Answer: 7
- 15 − 8 = 7
10.6 + (answer space) = 15
Answer: 9
- 15 − 6 = 9
11.15 − (answer space) = 4
Answer: 11
- 15 − 4 = 11
12. (answer space) − 3 = 7
Answer: 10
- 7 + 3 = 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.