Subtract whole tens from 3-digit

Solve these mental math problems!

1) Solve
109-10=
2) Solve
690-20=
3) Solve
252-30=
4) Solve
575-50=
5) Solve
434-70=
6) Solve
463-60=
7) Solve
389-30=
8) Solve
570-70=
9) Solve
343-10=
10) Solve
928-50=
11) Solve
100-30=
12) Solve
211-50=
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