Subtract 3-digit from thousand

Solve these mental math problems!

1) Solve
6000-675=
2) Solve
5000-970=
3) Solve
9000-993=
4) Solve
6000-237=
5) Solve
6000-810=
6) Solve
6000-569=
7) Solve
4000-676=
8) Solve
4000-991=
9) Solve
8000-816=
10) Solve
1000-469=
11) Solve
5000-513=
12) Solve
2000-314=
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