Grade 1 · Math · Challenge
Free Subtraction Within 20 worksheet - version 17
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 · Stretch challenge · 14 questions · Version PG-BM4MSJ-EJCW
1.12 - 9 =
2.17 - 15 =
3.15 - 3 =
4.11 - 2 =
5.7 - 1 =
6.3 - 0 =
7.10 - 7 =
8.13 - 9 =
9.12 - 7 =
10.19 - 8 =
11.13 - 1 =
12.14 - 0 =
13.2 - 2 =
14.14 - 11 =
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 17
- 12 - 9 =3
- 17 - 15 =2
- 15 - 3 =12
- 11 - 2 =9
- 7 - 1 =6
- 3 - 0 =3
- 10 - 7 =3
- 13 - 9 =4
- 12 - 7 =5
- 19 - 8 =11
- 13 - 1 =12
- 14 - 0 =14
- 2 - 2 =0
- 14 - 11 =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.