Vertically align numbers with Larger Number on top:
| 6 | 8 | . | 0 | |
| − | 1 | 0 | . | 2 |
Subtract using place value:
| Tens | Ones | Tenths | ||
|---|---|---|---|---|
| 7 | 10 | |||
| 68 | 6 | 8 | . | 0 |
| 10.2 | 1 | 0 | . | 2 |
| Difference | 5 | 7 | . | 8 |
Column traversal from right to left
Tenths column:
Tenths column:
- Since 0 is less than 2, we have to borrow 1 from the Ones column
- As a result, 0 becomes 10, and 10 − 2 = 8
- The 8 in the Ones column becomes 7
Ones column:
- 7 − 0 = 7
Tens column:
- 6 − 1 = 5
| 7 | 10 | |||
| 6 | 8 | . | 0 | |
| − | 1 | 0 | . | 2 |
| 5 | 7 | . | 8 |
Therefore, the Difference between 68 and 10.2 is 57.8
Check computation by comparing Larger Number and the Sum of Difference and Smaller Number:
| 1 | ||||
| 5 | 7 | . | 8 | |
| 1 | 0 | . | 2 | |
| 6 | 8 | . | 0 |
Sum of Difference and Smaller Number = 68 (trailing zero is dropped)
Sum of Difference and Smaller Number = Larger Number (68 = 68) ✓
