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Missing Number — Adding to 10 is a free printable Grade 1 maths worksheet on the unknown in an addition within ten, aligned to Common Core standard 1.OA.D.8. It prints 16 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 19 of 25 · the same problems every time you open this link.

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One paper per pupil

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Missing Number — Adding to 10

1.OA.D.8

NameDate

Work out each answer.

1.3 + ___ = 6
2.5 + ___ = 9
3.1 + ___ = 2
4.5 + ___ = 8
5.6 + ___ = 7
6.4 + ___ = 9
7.3 + ___ = 4
8.4 + ___ = 6
9.4 + ___ = 8
10.2 + ___ = 3
11.1 + ___ = 3
12.2 + ___ = 7
13.5 + ___ = 6
14.8 + ___ = 9
15.6 + ___ = 8
16.1 + ___ = 7

LessonPrint · 1.OA.D.8 · Set 19 · free to copy for classroom use

Answer key — Missing Number — Adding to 10

Set 19. Prints on its own sheet.

  1. 1.3
  2. 2.4
  3. 3.1
  4. 4.3
  5. 5.1
  6. 6.5
  7. 7.1
  8. 8.2
  9. 9.4
  10. 10.1
  11. 11.2
  12. 12.5
  13. 13.1
  14. 14.1
  15. 15.2
  16. 16.6

More practice for 1.OA.D.8

Find the missing number in a number sentence.

Teaching this next? Finding the Missing Number is the 40-minute plan for it, with the misconceptions to expect.

All Grade 1 worksheets

Last reviewed 2026-09-05. Aligned to 1.OA.D.8 of the Common Core State Standards for mathematics.