Subtract whole tens from 1000

Solve these mental math problems!

1) Solve
1000-720=
2) Solve
1000-310=
3) Solve
1000-40=
4) Solve
1000-730=
5) Solve
1000-760=
6) Solve
1000-90=
7) Solve
1000-40=
8) Solve
1000-850=
9) Solve
1000-90=
10) Solve
1000-780=
11) Solve
1000-680=
12) Solve
1000-300=
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