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Grade 1 · Math · Building Confidence

Free Addition Within 20 worksheet - version 13

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 · Building confidence · 14 questions · Version PG-1BT4QZ5-PNVM

Free printable
1.15 + 5 =
2.11 + 9 =
3.0 + 5 =
4.2 + 18 =
5.14 + 6 =
6.15 + 1 =
7.5 + 2 =
8.6 + 4 =
9.16 + 0 =
10.12 + 6 =
11.4 + 4 =
12.17 + 3 =
13.12 + 8 =
14.16 + 4 =
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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 13
  1. 15 + 5 =20
  2. 11 + 9 =20
  3. 0 + 5 =5
  4. 2 + 18 =20
  5. 14 + 6 =20
  6. 15 + 1 =16
  7. 5 + 2 =7
  8. 6 + 4 =10
  9. 16 + 0 =16
  10. 12 + 6 =18
  11. 4 + 4 =8
  12. 17 + 3 =20
  13. 12 + 8 =20
  14. 16 + 4 =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.