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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 16

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-2CKES0-1PYH

Free printable
1.8 + 9 =
2.4 + 4 =
3.20 + 0 =
4.9 + 11 =
5.18 + 2 =
6.17 + 0 =
7.4 + 0 =
8.13 + 0 =
9.13 + 7 =
10.18 + 0 =
11.14 + 6 =
12.16 + 4 =
13.17 + 3 =
14.7 + 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 16
  1. 8 + 9 =17
  2. 4 + 4 =8
  3. 20 + 0 =20
  4. 9 + 11 =20
  5. 18 + 2 =20
  6. 17 + 0 =17
  7. 4 + 0 =4
  8. 13 + 0 =13
  9. 13 + 7 =20
  10. 18 + 0 =18
  11. 14 + 6 =20
  12. 16 + 4 =20
  13. 17 + 3 =20
  14. 7 + 5 =12

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.