Subtract 3-digit from thousand

Solve these mental math problems!

1) Solve
2000-806=
2) Solve
9000-602=
3) Solve
8000-738=
4) Solve
9000-215=
5) Solve
4000-537=
6) Solve
2000-540=
7) Solve
8000-440=
8) Solve
3000-990=
9) Solve
1000-222=
10) Solve
8000-970=
11) Solve
8000-120=
12) Solve
6000-763=
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