Taking away 0 or 1

Subtract the numbers to find the difference.

1) Solve
4-0=
2) Solve
16-1=
3) Solve
19-0=
4) Solve
6-1=
5) Solve
5-0=
6) Solve
16-1=
7) Solve
19-0=
8) Solve
11-0=
9) Solve
18-1=
10) Solve
13-1=
11) Solve
10-0=
12) Solve
7-0=
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