PencilGo
Sign in

Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 20

Practice addition facts and strategies with sums through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.

Download free PDF

Addition Within 20

Grade 1 · Stretch challenge · 14 questions · Version PG-11V06GP-1PYH

Free printable
1.8 + 12 =
2.12 + 5 =
3.10 + 2 =
4.14 + 6 =
5.19 + 1 =
6.6 + 10 =
7.15 + 5 =
8.3 + 7 =
9.20 + 0 =
10.5 + 14 =
11.3 + 5 =
12.0 + 13 =
13.8 + 0 =
14.11 + 9 =
Worksheet PDFAnswer keyCustomize

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 20
  1. 8 + 12 =20
  2. 12 + 5 =17
  3. 10 + 2 =12
  4. 14 + 6 =20
  5. 19 + 1 =20
  6. 6 + 10 =16
  7. 15 + 5 =20
  8. 3 + 7 =10
  9. 20 + 0 =20
  10. 5 + 14 =19
  11. 3 + 5 =8
  12. 0 + 13 =13
  13. 8 + 0 =8
  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.