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Grade 1 · Math · Challenge

Free Subtraction Within 20 worksheet - version 19

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-FHZ2I5-EJCW

Free printable
1.20 - 1 =
2.11 - 8 =
3.3 - 0 =
4.5 - 2 =
5.14 - 12 =
6.20 - 18 =
7.2 - 1 =
8.15 - 3 =
9.14 - 6 =
10.17 - 9 =
11.12 - 2 =
12.20 - 10 =
13.4 - 4 =
14.8 - 1 =
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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 19
  1. 20 - 1 =19
  2. 11 - 8 =3
  3. 3 - 0 =3
  4. 5 - 2 =3
  5. 14 - 12 =2
  6. 20 - 18 =2
  7. 2 - 1 =1
  8. 15 - 3 =12
  9. 14 - 6 =8
  10. 17 - 9 =8
  11. 12 - 2 =10
  12. 20 - 10 =10
  13. 4 - 4 =0
  14. 8 - 1 =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.