1st Grade Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 4 — 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 4 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) + 5 = 17
Answer: 12
- 17 − 5 = 12
2.16 − (answer space) = 2
Answer: 14
- 16 − 2 = 14
3. (answer space) − 13 = 7
Answer: 20
- 7 + 13 = 20
4.8 + (answer space) = 13
Answer: 5
- 13 − 8 = 5
5.12 + (answer space) = 20
Answer: 8
- 20 − 12 = 8
6. (answer space) + 1 = 6
Answer: 5
- 6 − 1 = 5
7. (answer space) − 7 = 6
Answer: 13
- 6 + 7 = 13
8. (answer space) + 15 = 17
Answer: 2
- 17 − 15 = 2
9.15 − (answer space) = 12
Answer: 3
- 15 − 12 = 3
10.5 − (answer space) = 4
Answer: 1
- 5 − 4 = 1
11. (answer space) − 8 = 1
Answer: 9
- 1 + 8 = 9
12.1 + (answer space) = 5
Answer: 4
- 5 − 1 = 4
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.
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