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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 8

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-1Q9IZG1-1PYH

Free printable
1.8 + 12 =
2.19 + 1 =
3.18 + 2 =
4.7 + 13 =
5.3 + 16 =
6.17 + 0 =
7.1 + 17 =
8.6 + 14 =
9.2 + 15 =
10.0 + 5 =
11.0 + 9 =
12.5 + 7 =
13.14 + 6 =
14.1 + 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 8
  1. 8 + 12 =20
  2. 19 + 1 =20
  3. 18 + 2 =20
  4. 7 + 13 =20
  5. 3 + 16 =19
  6. 17 + 0 =17
  7. 1 + 17 =18
  8. 6 + 14 =20
  9. 2 + 15 =17
  10. 0 + 5 =5
  11. 0 + 9 =9
  12. 5 + 7 =12
  13. 14 + 6 =20
  14. 1 + 7 =8

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.