Subtract Whole Hundreds from 4-Digit Numbers

Solve these mental math problems!

1) Solve
6969-600=
2) Solve
2101-900=
3) Solve
9799-300=
4) Solve
7535-400=
5) Solve
2214-500=
6) Solve
7249-700=
7) Solve
6591-400=
8) Solve
5911-200=
9) Solve
4435-600=
10) Solve
5157-600=
11) Solve
2969-400=
12) Solve
3007-700=
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