Subtraction Across Zeros

Solve the subtraction problems below.

1) Solve
500-250=
2) Solve
900-545=
3) Solve
400-189=
4) Solve
500-250=
5) Solve
400-342=
6) Solve
700-63=
7) Solve
500-396=
8) Solve
800-183=
9) Solve
400-178=
10) Solve
900-654=
11) Solve
700-423=
12) Solve
500-109=
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