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Grade 1 · Math · Challenge

Free Subtraction Within 20 worksheet - version 12

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-CG3FVG-EJCW

Free printable
1.10 - 2 =
2.17 - 10 =
3.8 - 8 =
4.7 - 7 =
5.16 - 12 =
6.19 - 3 =
7.17 - 9 =
8.11 - 10 =
9.2 - 1 =
10.19 - 4 =
11.19 - 17 =
12.12 - 9 =
13.20 - 10 =
14.8 - 7 =
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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 12
  1. 10 - 2 =8
  2. 17 - 10 =7
  3. 8 - 8 =0
  4. 7 - 7 =0
  5. 16 - 12 =4
  6. 19 - 3 =16
  7. 17 - 9 =8
  8. 11 - 10 =1
  9. 2 - 1 =1
  10. 19 - 4 =15
  11. 19 - 17 =2
  12. 12 - 9 =3
  13. 20 - 10 =10
  14. 8 - 7 =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.