Subtracting within 20

Subtract the numbers to find the difference.

1) Solve
16-10=
2) Solve
17-4=
3) Solve
16-9=
4) Solve
15-3=
5) Solve
18-10=
6) Solve
16-5=
7) Solve
12-3=
8) Solve
19-1=
9) Solve
20-7=
10) Solve
14-5=
11) Solve
14-6=
12) Solve
17-8=
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