Grade 1 · Math · Challenge
Free Subtraction Within 20 worksheet - version 4
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-17JUS9X-EJCW
1.
12 - 0 =
2.
16 - 15 =
3.
4 - 3 =
4.
7 - 3 =
5.
20 - 16 =
6.
15 - 15 =
7.
10 - 0 =
8.
11 - 10 =
9.
19 - 1 =
10.
5 - 5 =
11.
8 - 6 =
12.
11 - 0 =
13.
16 - 9 =
14.
20 - 5 =
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 4
- 12 - 0 =12
- 16 - 15 =1
- 4 - 3 =1
- 7 - 3 =4
- 20 - 16 =4
- 15 - 15 =0
- 10 - 0 =10
- 11 - 10 =1
- 19 - 1 =18
- 5 - 5 =0
- 8 - 6 =2
- 11 - 0 =11
- 16 - 9 =7
- 20 - 5 =15
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.