Vertically align numbers with Larger Number on top:
| 9 | 0 | 8 | 0 | |
| − | 4 | 7 | 8 | 9 |
Subtract using place value:
| Thousands | Hundreds | Tens | Ones | |
|---|---|---|---|---|
| 9 | 17 | |||
| 8 | 10 | 7 | 10 | |
| 9,080 | 9 | 0 | 8 | 0 |
| 4,789 | 4 | 7 | 8 | 9 |
| Difference | 4 | 2 | 9 | 1 |
Column traversal from right to left
Ones column:
Ones column:
- Since 0 is less than 9, we have to borrow 1 from the Tens column
- As a result, 0 becomes 10, and 10 − 9 = 1
- The 8 in the Tens column becomes 7
Tens column:
- Since 7 is less than 8, we have to borrow 1 from the Hundreds column
- As a result, 7 becomes 17, and 17 − 8 = 9
- The 0 in the Hundreds column becomes 9 after borrowing 1 from its regrouped value of 10
Hundreds column:
- 9 − 7 = 2
- Because it was the first nonzero digit to the left of the 8 in the Tens column, the 9 in the Thousands column became 8 after 1 was borrowed for the purpose of regrouping the 0 in the Hundreds column (borrowing across a 0)
Thousands column:
- 8 − 4 = 4
| 9 | 17 | |||
| 8 | 10 | 7 | 10 | |
| 9 | 0 | 8 | 0 | |
| − | 4 | 7 | 8 | 9 |
| 4 | 2 | 9 | 1 |
Therefore, the Difference between 9,080 and 4,789 is 4,291
Check computation by comparing Larger Number and the Sum of Smaller Number and Difference:
| 1 | 1 | 1 | ||
| 4 | 7 | 8 | 9 | |
| 4 | 2 | 9 | 1 | |
| 9 | 0 | 8 | 0 |
Sum of Smaller Number and Difference = 9,080
Sum of Smaller Number and Difference = Larger Number (9,080 = 9,080) ✓
