Grade 1 · Math · On Level
Free Subtraction Within 20 worksheet - version 1
Build subtraction fluency with numbers through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.
Subtraction Within 20
Grade 1 · On-level practice · 14 questions · Version PG-IW2BTY-IB6W
1.15 - 3 =
2.18 - 7 =
3.1 - 0 =
4.18 - 6 =
5.13 - 7 =
6.14 - 13 =
7.12 - 10 =
8.4 - 0 =
9.5 - 0 =
10.17 - 17 =
11.15 - 13 =
12.18 - 17 =
13.19 - 15 =
14.20 - 17 =
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 1
- 15 - 3 =12
- 18 - 7 =11
- 1 - 0 =1
- 18 - 6 =12
- 13 - 7 =6
- 14 - 13 =1
- 12 - 10 =2
- 4 - 0 =4
- 5 - 0 =5
- 17 - 17 =0
- 15 - 13 =2
- 18 - 17 =1
- 19 - 15 =4
- 20 - 17 =3
Worked example
16 - 7 = 9. Break 7 into 6 and 1: 16 - 6 - 1 = 9.
Common mistake
Switching the order of the numbers because subtraction is not commutative.
Helpful hint
Count back to 10, then subtract what remains.