Column 4 Subtraction

Problem:

 756
-239
-----
517

Solution:

To solve this subtraction problem, we subtract the numbers column by column, starting from the rightmost column (the ones place).

1. Ones place: 6 - 9. We need to borrow from the tens place. The tens place becomes 4 and the ones place becomes 16. 16 - 9 = 7. Write down 7.
2. Tens place: 4 - 3 = 1. Write down 1.
3. Hundreds place: 7 - 2 = 5. Write down 5.

Result: 517