Borrow over two zeros

Find the difference of the numbers below. Use regrouping where necessary.

1) Solve

2000

-242

2) Solve

3000

-757

3) Solve

7000

-508

4) Solve

5000

-680

5) Solve

4000

-907

6) Solve

4000

-405

7) Solve

3000

-342

8) Solve

9000

-319

9) Solve

6000

-733

10) Solve

2000

-296

11) Solve

9000

-360

12) Solve

3000

-420