Vertically align numbers with Larger Number on top:
| 5 | 0 | 6 | |
| − | 4 | 5 | 7 |
Subtract using place value:
| Hundreds | Tens | Ones | |
|---|---|---|---|
| 9 | |||
| 4 | 10 | 16 | |
| 506 | 5 | 0 | 6 |
| 457 | 4 | 5 | 7 |
| Difference | 4 | 9 |
Column traversal from right to left
Ones column:
Ones column:
- Since 6 is less than 7, we have to borrow 1 from the Tens column
- As a result, 6 becomes 16, and 16 − 7 = 9
- The 0 in the Tens column becomes 9 after borrowing 1 from its regrouped value of 10
Tens column:
- 9 − 5 = 4
- Because it was the first nonzero digit to the left of the 6 in the Ones column, the 5 in the Hundreds column became 4 after 1 was borrowed for the purpose of regrouping the 0 in the Tens column (borrowing across a 0)
Hundreds column:
- 4 − 4 = 0
Note: Leading zero is dropped
| 9 | |||
| 4 | 10 | 16 | |
| 5 | 0 | 6 | |
| − | 4 | 5 | 7 |
| 4 | 9 |
Therefore, the Difference between 506 and 457 is 49
Check computation by comparing Larger Number and the Sum of Smaller Number and Difference:
| 1 | 1 | ||
| 4 | 5 | 7 | |
| 4 | 9 | ||
| 5 | 0 | 6 |
Sum of Smaller Number and Difference = 506
Sum of Smaller Number and Difference = Larger Number (506 = 506) ✓
