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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 3

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-1N7NCTC-1PYH

Free printable
1.14 + 6 =
2.12 + 6 =
3.16 + 4 =
4.12 + 0 =
5.3 + 6 =
6.12 + 8 =
7.3 + 14 =
8.13 + 0 =
9.20 + 0 =
10.17 + 3 =
11.9 + 10 =
12.0 + 6 =
13.10 + 2 =
14.2 + 18 =
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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 3
  1. 14 + 6 =20
  2. 12 + 6 =18
  3. 16 + 4 =20
  4. 12 + 0 =12
  5. 3 + 6 =9
  6. 12 + 8 =20
  7. 3 + 14 =17
  8. 13 + 0 =13
  9. 20 + 0 =20
  10. 17 + 3 =20
  11. 9 + 10 =19
  12. 0 + 6 =6
  13. 10 + 2 =12
  14. 2 + 18 =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.