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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 12

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 · Stretch challenge · 14 questions · Version PG-3GITJW-1PYH

Free printable
1.7 + 13 =
2.6 + 14 =
3.8 + 2 =
4.20 + 0 =
5.11 + 9 =
6.2 + 17 =
7.9 + 0 =
8.17 + 3 =
9.10 + 5 =
10.7 + 4 =
11.2 + 18 =
12.8 + 12 =
13.15 + 4 =
14.15 + 5 =
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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 12
  1. 7 + 13 =20
  2. 6 + 14 =20
  3. 8 + 2 =10
  4. 20 + 0 =20
  5. 11 + 9 =20
  6. 2 + 17 =19
  7. 9 + 0 =9
  8. 17 + 3 =20
  9. 10 + 5 =15
  10. 7 + 4 =11
  11. 2 + 18 =20
  12. 8 + 12 =20
  13. 15 + 4 =19
  14. 15 + 5 =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.