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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 1

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-1NRMK7A-1PYH

Free printable
1.5 + 14 =
2.1 + 8 =
3.1 + 17 =
4.5 + 1 =
5.0 + 13 =
6.10 + 10 =
7.19 + 1 =
8.11 + 5 =
9.0 + 17 =
10.3 + 12 =
11.7 + 3 =
12.2 + 8 =
13.13 + 1 =
14.0 + 3 =
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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 1
  1. 5 + 14 =19
  2. 1 + 8 =9
  3. 1 + 17 =18
  4. 5 + 1 =6
  5. 0 + 13 =13
  6. 10 + 10 =20
  7. 19 + 1 =20
  8. 11 + 5 =16
  9. 0 + 17 =17
  10. 3 + 12 =15
  11. 7 + 3 =10
  12. 2 + 8 =10
  13. 13 + 1 =14
  14. 0 + 3 =3

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.