Vertically align numbers with Larger Number on top:
| 3 | 0 | |
| − | 2 | 0 |
Subtract using place value:
| Tens | Ones | |
|---|---|---|
| 30 | 3 | 0 |
| 20 | 2 | 0 |
| Difference | 1 | 0 |
Column traversal from right to left
Ones column:
Ones column:
- 0 − 0 = 0
Tens column:
- 3 − 2 = 1
| 3 | 0 | |
| − | 2 | 0 |
| 1 | 0 |
Therefore, the Difference between 30 and 20 is 10
Check computation by comparing Larger Number and the Sum of Smaller Number and Difference:
| 2 | 0 | |
| 1 | 0 | |
| 3 | 0 |
Sum of Smaller Number and Difference = 30
Sum of Smaller Number and Difference = Larger Number (30 = 30) ✓
