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Grade 1 · Math · Building Confidence

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 · Building confidence · 14 questions · Version PG-18R94CG-PNVM

Free printable
1.3 + 6 =
2.14 + 1 =
3.4 + 16 =
4.13 + 7 =
5.9 + 11 =
6.18 + 2 =
7.1 + 10 =
8.6 + 14 =
9.2 + 1 =
10.3 + 2 =
11.10 + 0 =
12.7 + 13 =
13.8 + 1 =
14.11 + 9 =
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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. 3 + 6 =9
  2. 14 + 1 =15
  3. 4 + 16 =20
  4. 13 + 7 =20
  5. 9 + 11 =20
  6. 18 + 2 =20
  7. 1 + 10 =11
  8. 6 + 14 =20
  9. 2 + 1 =3
  10. 3 + 2 =5
  11. 10 + 0 =10
  12. 7 + 13 =20
  13. 8 + 1 =9
  14. 11 + 9 =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.