Vertically align numbers with Larger Number on top:
| 3 | 0 | 0 | |
| − | 1 | 2 | 7 |
Subtract using place value:
| Hundreds | Tens | Ones | |
|---|---|---|---|
| 9 | |||
| 2 | 10 | 10 | |
| 300 | 3 | 0 | 0 |
| 127 | 1 | 2 | 7 |
| Difference | 1 | 7 | 3 |
Column traversal from right to left
Ones column:
Ones column:
- Since 0 is less than 7, we have to borrow 1 from the Tens column
- As a result, 0 becomes 10, and 10 − 7 = 3
- The 0 in the Tens column becomes 9 after borrowing 1 from its regrouped value of 10
Tens column:
- 9 − 2 = 7
- Because it was the first nonzero digit to the left of the 0 in the Ones column, the 3 in the Hundreds column became 2 after 1 was borrowed for the purpose of regrouping the 0 in the Tens column (borrowing across a 0)
Hundreds column:
- 2 − 1 = 1
| 9 | |||
| 2 | 10 | 10 | |
| 3 | 0 | 0 | |
| − | 1 | 2 | 7 |
| 1 | 7 | 3 |
Therefore, the Difference between 300 and 127 is 173
Check computation by comparing Larger Number and the Sum of Difference and Smaller Number:
| 1 | 1 | ||
| 1 | 7 | 3 | |
| 1 | 2 | 7 | |
| 3 | 0 | 0 |
Sum of Difference and Smaller Number = 300
Sum of Difference and Smaller Number = Larger Number (300 = 300) ✓
