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Grade 1 · Math · On Level

Free Addition Within 20 worksheet - version 13

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-1HTRPHR-L19P

Free printable
1.5 + 8 =
2.12 + 8 =
3.18 + 2 =
4.20 + 0 =
5.15 + 5 =
6.2 + 18 =
7.4 + 14 =
8.9 + 2 =
9.6 + 2 =
10.3 + 15 =
11.6 + 14 =
12.17 + 3 =
13.14 + 6 =
14.9 + 8 =
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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 13
  1. 5 + 8 =13
  2. 12 + 8 =20
  3. 18 + 2 =20
  4. 20 + 0 =20
  5. 15 + 5 =20
  6. 2 + 18 =20
  7. 4 + 14 =18
  8. 9 + 2 =11
  9. 6 + 2 =8
  10. 3 + 15 =18
  11. 6 + 14 =20
  12. 17 + 3 =20
  13. 14 + 6 =20
  14. 9 + 8 =17

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.