Grade 1 · Math · On Level
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.
Addition Within 20
Grade 1 · On-level practice · 14 questions · Version PG-1KBO4QI-L19P
1.8 + 12 =
2.1 + 18 =
3.20 + 0 =
4.9 + 5 =
5.11 + 0 =
6.0 + 19 =
7.2 + 15 =
8.5 + 3 =
9.6 + 2 =
10.19 + 1 =
11.5 + 1 =
12.10 + 10 =
13.2 + 7 =
14.13 + 4 =
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
- 8 + 12 =20
- 1 + 18 =19
- 20 + 0 =20
- 9 + 5 =14
- 11 + 0 =11
- 0 + 19 =19
- 2 + 15 =17
- 5 + 3 =8
- 6 + 2 =8
- 19 + 1 =20
- 5 + 1 =6
- 10 + 10 =20
- 2 + 7 =9
- 13 + 4 =17
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.