PencilGoPencilGo

Grade 1 · Math · Challenge

Free Addition Within 20 worksheet - version 2

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-1NHMYIB-1PYH

Four children and a teacher collaborate with blocks, patterns, and a notebook.
1.

10 + 9 =

2.

13 + 7 =

3.

0 + 16 =

4.

18 + 2 =

5.

20 + 0 =

6.

3 + 17 =

7.

11 + 0 =

8.

0 + 0 =

9.

5 + 2 =

10.

1 + 0 =

11.

14 + 6 =

12.

12 + 8 =

13.

11 + 9 =

14.

16 + 4 =

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 2
  1. 10 + 9 =19
  2. 13 + 7 =20
  3. 0 + 16 =16
  4. 18 + 2 =20
  5. 20 + 0 =20
  6. 3 + 17 =20
  7. 11 + 0 =11
  8. 0 + 0 =0
  9. 5 + 2 =7
  10. 1 + 0 =1
  11. 14 + 6 =20
  12. 12 + 8 =20
  13. 11 + 9 =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.