Subtract whole tens from 1000

Solve these mental math problems!

1) Solve
1000-460=
2) Solve
1000-620=
3) Solve
1000-500=
4) Solve
1000-350=
5) Solve
1000-30=
6) Solve
1000-730=
7) Solve
1000-50=
8) Solve
1000-460=
9) Solve
1000-660=
10) Solve
1000-600=
11) Solve
1000-930=
12) Solve
1000-420=
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