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Grade 1 · Math · Challenge

Free Subtraction Within 20 worksheet - version 8

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-18NT71T-EJCW

Free printable
1.9 - 3 =
2.17 - 9 =
3.15 - 6 =
4.1 - 1 =
5.17 - 3 =
6.12 - 0 =
7.14 - 6 =
8.10 - 4 =
9.17 - 4 =
10.8 - 4 =
11.9 - 9 =
12.20 - 19 =
13.16 - 3 =
14.17 - 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 8
  1. 9 - 3 =6
  2. 17 - 9 =8
  3. 15 - 6 =9
  4. 1 - 1 =0
  5. 17 - 3 =14
  6. 12 - 0 =12
  7. 14 - 6 =8
  8. 10 - 4 =6
  9. 17 - 4 =13
  10. 8 - 4 =4
  11. 9 - 9 =0
  12. 20 - 19 =1
  13. 16 - 3 =13
  14. 17 - 2 =15

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.