Vertically align numbers with Larger Number on top:
2 | 7 | |
− | 1 | 9 |
Subtract using place value:
Tens | Ones | |
---|---|---|
1 | 17 | |
27 | 2 | 7 |
19 | 1 | 9 |
Difference | 8 |
Column traversal from right to left
Ones column:
Ones column:
- Since 7 is less than 9, we have to borrow 1 from the Tens column
- As a result, 7 becomes 17, and 17 − 9 = 8
- The 2 in the Tens column becomes 1
Tens column:
- 1 − 1 = 0
Note: Leading zero is dropped
1 | 17 | |
2 | 7 | |
− | 1 | 9 |
8 |
Therefore, the Difference between 27 and 19 is 8
Check computation by comparing Larger Number and the Sum of Smaller Number and Difference:
1 | ||
1 | 9 | |
8 | ||
2 | 7 |
Sum of Smaller Number and Difference = 27
Sum of Smaller Number and Difference = Larger Number (27 = 27) ✓