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Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 18

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-68EUHM-1PYH

Free printable
1.7 + 9 =
2.15 + 5 =
3.12 + 8 =
4.7 + 13 =
5.12 + 2 =
6.14 + 6 =
7.19 + 1 =
8.18 + 2 =
9.4 + 12 =
10.11 + 3 =
11.13 + 7 =
12.8 + 1 =
13.0 + 15 =
14.7 + 8 =
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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 18
  1. 7 + 9 =16
  2. 15 + 5 =20
  3. 12 + 8 =20
  4. 7 + 13 =20
  5. 12 + 2 =14
  6. 14 + 6 =20
  7. 19 + 1 =20
  8. 18 + 2 =20
  9. 4 + 12 =16
  10. 11 + 3 =14
  11. 13 + 7 =20
  12. 8 + 1 =9
  13. 0 + 15 =15
  14. 7 + 8 =15

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.