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Grade 1 · Math · Challenge

Free Subtraction Within 20 worksheet - version 7

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-16PVZ70-EJCW

1.

7 - 2 =

2.

9 - 5 =

3.

11 - 1 =

4.

4 - 4 =

5.

6 - 3 =

6.

17 - 6 =

7.

19 - 10 =

8.

20 - 17 =

9.

20 - 8 =

10.

3 - 1 =

11.

7 - 0 =

12.

3 - 2 =

13.

15 - 12 =

14.

6 - 4 =

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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 7
  1. 7 - 2 =5
  2. 9 - 5 =4
  3. 11 - 1 =10
  4. 4 - 4 =0
  5. 6 - 3 =3
  6. 17 - 6 =11
  7. 19 - 10 =9
  8. 20 - 17 =3
  9. 20 - 8 =12
  10. 3 - 1 =2
  11. 7 - 0 =7
  12. 3 - 2 =1
  13. 15 - 12 =3
  14. 6 - 4 =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.