3rd Grade Missing Numbers in Number Sentences Worksheet — Level 1 — 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 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) − 2 = 11
Answer: 13
- 11 + 2 = 13
2. (answer space) + 1 = 6
Answer: 5
- 6 − 1 = 5
3. (answer space) − 6 = 1
Answer: 7
- 1 + 6 = 7
4.19 − (answer space) = 15
Answer: 4
- 19 − 15 = 4
5. (answer space) + 7 = 13
Answer: 6
- 13 − 7 = 6
6.11 − (answer space) = 7
Answer: 4
- 11 − 7 = 4
7. (answer space) − 6 = 11
Answer: 17
- 11 + 6 = 17
8.7 + (answer space) = 17
Answer: 10
- 17 − 7 = 10
9. (answer space) + 5 = 18
Answer: 13
- 18 − 5 = 13
10.6 + (answer space) = 19
Answer: 13
- 19 − 6 = 13
11.1 + (answer space) = 8
Answer: 7
- 8 − 1 = 7
12.7 + (answer space) = 9
Answer: 2
- 9 − 7 = 2
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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