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Grade 1 · Math · On Level

Free Addition Within 20 worksheet - version 9

Practice addition facts and strategies with sums through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.

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Addition Within 20

Grade 1 · On-level practice · 14 questions · Version PG-A85AF2-L19P

1.

8 + 12 =

2.

5 + 9 =

3.

16 + 4 =

4.

6 + 0 =

5.

3 + 8 =

6.

9 + 11 =

7.

7 + 13 =

8.

19 + 1 =

9.

17 + 3 =

10.

1 + 1 =

11.

15 + 5 =

12.

0 + 3 =

13.

4 + 2 =

14.

18 + 2 =

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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 9
  1. 8 + 12 =20
  2. 5 + 9 =14
  3. 16 + 4 =20
  4. 6 + 0 =6
  5. 3 + 8 =11
  6. 9 + 11 =20
  7. 7 + 13 =20
  8. 19 + 1 =20
  9. 17 + 3 =20
  10. 1 + 1 =2
  11. 15 + 5 =20
  12. 0 + 3 =3
  13. 4 + 2 =6
  14. 18 + 2 =20

Worked example

8 + 7 = 15. Make ten: 8 + 2 + 5 = 15.

Common mistake

Losing part of the second addend when making ten.

Helpful hint

Look for a way to make 10 first.