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Grade 1 · Math · Challenge

Free Subtraction Within 20 worksheet - version 18

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-F7ZGT6-EJCW

Free printable
1.5 - 3 =
2.14 - 9 =
3.2 - 2 =
4.6 - 4 =
5.7 - 0 =
6.20 - 17 =
7.18 - 3 =
8.19 - 9 =
9.2 - 1 =
10.6 - 6 =
11.2 - 0 =
12.6 - 0 =
13.11 - 0 =
14.17 - 10 =
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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 18
  1. 5 - 3 =2
  2. 14 - 9 =5
  3. 2 - 2 =0
  4. 6 - 4 =2
  5. 7 - 0 =7
  6. 20 - 17 =3
  7. 18 - 3 =15
  8. 19 - 9 =10
  9. 2 - 1 =1
  10. 6 - 6 =0
  11. 2 - 0 =2
  12. 6 - 0 =6
  13. 11 - 0 =11
  14. 17 - 10 =7

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.