1. Arrange in columns, then subtract. 845- 231?

2. Arrange in columns, then subtract. 8 493 - 6 291 = ?

3. Arrange in columns, then subtract. 8 359 - 2 289 = ?

4. Arrange in columns, then subtract. 5 723- 3 945 = ?

5. Arrange in columns, then subtract. 2 873- 1 751 = ?

6. Arrange in columns, then subtract. 93 857 - 26 468= ?

7. Arrange in columns, then subtract. 877- 389 ?

8. Arrange in columns, then subtract. 5 769- 3 255?

9. Arrange in columns, then subtract. 4 632 - 2 520 ?

10. Arrange in columns, then subtract. 8 004 - 2 977 ?