Subtracting within 20 is where strategies like "subtract to ten" pay off. For 15 − 7, take 5 to reach 10, then 2 more to reach 8.
Grades 1–2
Common Core 1.OA.C.6, 2.OA.B.2
Answer key included
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NameDate
Subtraction Within 20
Score / 30
Subtract.
1.15−11=
2.18−8=
3.14−2=
4.8−2=
5.13−0=
6.8−6=
7.13−7=
8.15−13=
9.7−1=
10.17−4=
11.14−9=
12.13−11=
13.7−0=
14.20−5=
15.4−1=
16.20−0=
17.13−2=
18.7−4=
19.17−6=
20.14−4=
21.12−8=
22.19−2=
23.10−3=
24.8−4=
25.6−1=
26.5−1=
27.3−1=
28.6−0=
29.11−5=
30.19−16=
Answer keySubtraction Within 20
Subtract.
1.15−11=4
2.18−8=10
3.14−2=12
4.8−2=6
5.13−0=13
6.8−6=2
7.13−7=6
8.15−13=2
9.7−1=6
10.17−4=13
11.14−9=5
12.13−11=2
13.7−0=7
14.20−5=15
15.4−1=3
16.20−0=20
17.13−2=11
18.7−4=3
19.17−6=11
20.14−4=10
21.12−8=4
22.19−2=17
23.10−3=7
24.8−4=4
25.6−1=5
26.5−1=4
27.3−1=2
28.6−0=6
29.11−5=6
30.19−16=3
What's on this worksheet
Starting numbers up to 20. Many problems cross ten, such as 13 − 6. Each sheet comes with an answer key on a separate page.
Teaching tips
Model "subtract to ten" with a ten-frame drawing.
Fact families (8 + 5, 5 + 8, 13 − 5, 13 − 8) let students see four facts at once.
How to use this worksheet maker
Press New worksheet for a fresh set of problems, then Print. To save a PDF instead, choose "Save as PDF" in the print window. Every sheet has a short code in the bottom corner. Copy the link to a sheet and you can print exactly the same problems again later, which is handy for retakes and for sharing with other teachers.
Common Core alignment: 1.OA.C.6, 2.OA.B.2 (Grades 1–2).