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Subtraction as Missing Part — to 20 is a free printable Grade 1 maths worksheet on reaching a subtraction through the addition fact, past ten, aligned to Common Core standard 1.OA.B.4. It prints 12 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 9 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.

Subtraction as Missing Part — to 20

1.OA.B.4

NameDate

Fill in both blanks.

1.16 + ___ = 25 , so 25 − 16 = ___
2.8 + ___ = 19 , so 19 − 8 = ___
3.13 + ___ = 21 , so 21 − 13 = ___
4.13 + ___ = 22 , so 22 − 13 = ___
5.12 + ___ = 21 , so 21 − 12 = ___
6.2 + ___ = 23 , so 23 − 2 = ___
7.5 + ___ = 21 , so 21 − 5 = ___
8.8 + ___ = 20 , so 20 − 8 = ___
9.12 + ___ = 25 , so 25 − 12 = ___
10.8 + ___ = 23 , so 23 − 8 = ___
11.6 + ___ = 19 , so 19 − 6 = ___
12.11 + ___ = 20 , so 20 − 11 = ___

LessonPrint · 1.OA.B.4 · Set 9 · free to copy for classroom use

Answer key — Subtraction as Missing Part — to 20

Set 9. Prints on its own sheet.

  1. 1.9 and 9
  2. 2.11 and 11
  3. 3.8 and 8
  4. 4.9 and 9
  5. 5.9 and 9
  6. 6.21 and 21
  7. 7.16 and 16
  8. 8.12 and 12
  9. 9.13 and 13
  10. 10.15 and 15
  11. 11.13 and 13
  12. 12.9 and 9

More practice for 1.OA.B.4

See subtraction as finding the missing part.

Teaching this next? Subtraction as a Missing Part 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.B.4 of the Common Core State Standards for mathematics.