Subtract whole hundreds from 3/4-digit

Solve these mental math problems!

1) Solve
500-300=
2) Solve
5800-100=
3) Solve
4500-300=
4) Solve
5800-300=
5) Solve
7700-300=
6) Solve
8800-200=
7) Solve
9200-200=
8) Solve
3000-200=
9) Solve
5600-200=
10) Solve
6700-300=
11) Solve
9300-100=
12) Solve
1700-100=
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