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Grade 1 · Math · Building Confidence

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 · Building confidence · 14 questions · Version PG-1JN2ZB4-1PAM

Free printable
1.14 - 5 =
2.10 - 6 =
3.1 - 0 =
4.6 - 3 =
5.9 - 6 =
6.11 - 7 =
7.6 - 0 =
8.20 - 15 =
9.15 - 12 =
10.18 - 8 =
11.20 - 9 =
12.12 - 3 =
13.20 - 19 =
14.12 - 12 =
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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. 14 - 5 =9
  2. 10 - 6 =4
  3. 1 - 0 =1
  4. 6 - 3 =3
  5. 9 - 6 =3
  6. 11 - 7 =4
  7. 6 - 0 =6
  8. 20 - 15 =5
  9. 15 - 12 =3
  10. 18 - 8 =10
  11. 20 - 9 =11
  12. 12 - 3 =9
  13. 20 - 19 =1
  14. 12 - 12 =0

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.