Subtract whole tens from 1000

Solve these mental math problems!

1) Solve
1000-680=
2) Solve
1000-420=
3) Solve
1000-110=
4) Solve
1000-570=
5) Solve
1000-860=
6) Solve
1000-380=
7) Solve
1000-50=
8) Solve
1000-230=
9) Solve
1000-220=
10) Solve
1000-100=
11) Solve
1000-420=
12) Solve
1000-420=
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