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Grade 1 · Math · Challenge

Free Subtraction Within 20 worksheet - version 4

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-17JUS9X-EJCW

Free printable
1.12 - 0 =
2.16 - 15 =
3.4 - 3 =
4.7 - 3 =
5.20 - 16 =
6.15 - 15 =
7.10 - 0 =
8.11 - 10 =
9.19 - 1 =
10.5 - 5 =
11.8 - 6 =
12.11 - 0 =
13.16 - 9 =
14.20 - 5 =
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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 4
  1. 12 - 0 =12
  2. 16 - 15 =1
  3. 4 - 3 =1
  4. 7 - 3 =4
  5. 20 - 16 =4
  6. 15 - 15 =0
  7. 10 - 0 =10
  8. 11 - 10 =1
  9. 19 - 1 =18
  10. 5 - 5 =0
  11. 8 - 6 =2
  12. 11 - 0 =11
  13. 16 - 9 =7
  14. 20 - 5 =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.