Grade 1 · Math · On Level
Free Subtraction Within 20 worksheet - version 3
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-IC34G0-IB6W
1.
12 - 5 =
2.
12 - 2 =
3.
13 - 9 =
4.
15 - 0 =
5.
5 - 5 =
6.
7 - 7 =
7.
13 - 1 =
8.
7 - 2 =
9.
1 - 1 =
10.
10 - 2 =
11.
6 - 3 =
12.
1 - 0 =
13.
18 - 6 =
14.
17 - 3 =
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 3
- 12 - 5 =7
- 12 - 2 =10
- 13 - 9 =4
- 15 - 0 =15
- 5 - 5 =0
- 7 - 7 =0
- 13 - 1 =12
- 7 - 2 =5
- 1 - 1 =0
- 10 - 2 =8
- 6 - 3 =3
- 1 - 0 =1
- 18 - 6 =12
- 17 - 3 =14
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.