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Grade 1 · Math · On Level

Free Subtraction Within 20 worksheet - version 18

Build subtraction fluency with numbers through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.

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Subtraction Within 20

Grade 1 · On-level practice · 14 questions · Version PG-12PYCCA-IB6W

Free printable
1.5 - 0 =
2.8 - 6 =
3.3 - 3 =
4.4 - 0 =
5.16 - 12 =
6.16 - 10 =
7.12 - 8 =
8.3 - 0 =
9.7 - 0 =
10.12 - 0 =
11.20 - 1 =
12.1 - 1 =
13.4 - 1 =
14.3 - 2 =
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Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 18
  1. 5 - 0 =5
  2. 8 - 6 =2
  3. 3 - 3 =0
  4. 4 - 0 =4
  5. 16 - 12 =4
  6. 16 - 10 =6
  7. 12 - 8 =4
  8. 3 - 0 =3
  9. 7 - 0 =7
  10. 12 - 0 =12
  11. 20 - 1 =19
  12. 1 - 1 =0
  13. 4 - 1 =3
  14. 3 - 2 =1

Worked example

16 - 7 = 9. Break 7 into 6 and 1: 16 - 6 - 1 = 9.

Common mistake

Switching the order of the numbers because subtraction is not commutative.

Helpful hint

Count back to 10, then subtract what remains.