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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 17

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-2MK0GZ-1PYH

Free printable
1.1 + 12 =
2.8 + 12 =
3.18 + 2 =
4.6 + 6 =
5.20 + 0 =
6.12 + 2 =
7.16 + 4 =
8.5 + 13 =
9.6 + 0 =
10.8 + 7 =
11.17 + 3 =
12.11 + 9 =
13.14 + 6 =
14.13 + 7 =
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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 17
  1. 1 + 12 =13
  2. 8 + 12 =20
  3. 18 + 2 =20
  4. 6 + 6 =12
  5. 20 + 0 =20
  6. 12 + 2 =14
  7. 16 + 4 =20
  8. 5 + 13 =18
  9. 6 + 0 =6
  10. 8 + 7 =15
  11. 17 + 3 =20
  12. 11 + 9 =20
  13. 14 + 6 =20
  14. 13 + 7 =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.