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Grade 1 · Math · Challenge

Free Subtraction Within 20 worksheet - version 20

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-1AUKSS9-EJCW

Free printable
1.7 - 6 =
2.11 - 8 =
3.6 - 2 =
4.12 - 6 =
5.18 - 2 =
6.14 - 7 =
7.1 - 1 =
8.4 - 3 =
9.16 - 6 =
10.20 - 11 =
11.5 - 5 =
12.12 - 0 =
13.13 - 6 =
14.1 - 0 =
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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 20
  1. 7 - 6 =1
  2. 11 - 8 =3
  3. 6 - 2 =4
  4. 12 - 6 =6
  5. 18 - 2 =16
  6. 14 - 7 =7
  7. 1 - 1 =0
  8. 4 - 3 =1
  9. 16 - 6 =10
  10. 20 - 11 =9
  11. 5 - 5 =0
  12. 12 - 0 =12
  13. 13 - 6 =7
  14. 1 - 0 =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.