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Grade 1 · Math · Challenge

Free Subtraction Within 20 worksheet - version 1

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 · Stretch challenge · 14 questions · Version PG-165WRT2-EJCW

Free printable
1.16 - 12 =
2.8 - 8 =
3.18 - 4 =
4.10 - 1 =
5.1 - 1 =
6.20 - 8 =
7.10 - 4 =
8.4 - 1 =
9.3 - 2 =
10.4 - 3 =
11.9 - 9 =
12.12 - 6 =
13.14 - 10 =
14.2 - 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 1
  1. 16 - 12 =4
  2. 8 - 8 =0
  3. 18 - 4 =14
  4. 10 - 1 =9
  5. 1 - 1 =0
  6. 20 - 8 =12
  7. 10 - 4 =6
  8. 4 - 1 =3
  9. 3 - 2 =1
  10. 4 - 3 =1
  11. 9 - 9 =0
  12. 12 - 6 =6
  13. 14 - 10 =4
  14. 2 - 2 =0

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.