Grade 1 · Math · Challenge
Free Subtraction Within 20 worksheet - version 2
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-15VX643-EJCW
1.
5 - 1 =
2.
17 - 1 =
3.
7 - 6 =
4.
11 - 8 =
5.
4 - 3 =
6.
8 - 6 =
7.
11 - 5 =
8.
8 - 3 =
9.
14 - 7 =
10.
16 - 16 =
11.
5 - 2 =
12.
15 - 4 =
13.
3 - 2 =
14.
18 - 8 =
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 2
- 5 - 1 =4
- 17 - 1 =16
- 7 - 6 =1
- 11 - 8 =3
- 4 - 3 =1
- 8 - 6 =2
- 11 - 5 =6
- 8 - 3 =5
- 14 - 7 =7
- 16 - 16 =0
- 5 - 2 =3
- 15 - 4 =11
- 3 - 2 =1
- 18 - 8 =10
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.