Grade 1 · Math · Challenge
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 · Stretch challenge · 14 questions · Version PG-15LXKF4-EJCW
1.
9 - 6 =
2.
19 - 6 =
3.
1 - 1 =
4.
11 - 9 =
5.
13 - 11 =
6.
7 - 0 =
7.
15 - 12 =
8.
18 - 8 =
9.
10 - 4 =
10.
17 - 3 =
11.
8 - 0 =
12.
13 - 10 =
13.
1 - 0 =
14.
16 - 13 =
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
- 9 - 6 =3
- 19 - 6 =13
- 1 - 1 =0
- 11 - 9 =2
- 13 - 11 =2
- 7 - 0 =7
- 15 - 12 =3
- 18 - 8 =10
- 10 - 4 =6
- 17 - 3 =14
- 8 - 0 =8
- 13 - 10 =3
- 1 - 0 =1
- 16 - 13 =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.