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Grade 1 · Math · Challenge

Free Subtraction Within 20 worksheet - version 15

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-C63U6H-EJCW

Free printable
1.15 - 11 =
2.19 - 10 =
3.20 - 13 =
4.8 - 5 =
5.13 - 6 =
6.6 - 0 =
7.7 - 4 =
8.17 - 16 =
9.6 - 1 =
10.2 - 1 =
11.4 - 1 =
12.18 - 14 =
13.7 - 5 =
14.13 - 11 =
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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 15
  1. 15 - 11 =4
  2. 19 - 10 =9
  3. 20 - 13 =7
  4. 8 - 5 =3
  5. 13 - 6 =7
  6. 6 - 0 =6
  7. 7 - 4 =3
  8. 17 - 16 =1
  9. 6 - 1 =5
  10. 2 - 1 =1
  11. 4 - 1 =3
  12. 18 - 14 =4
  13. 7 - 5 =2
  14. 13 - 11 =2

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.