Vertically align numbers with Larger Number on top:
| 1 | 3 | 1 | . | 7 | 0 | |
| − | 2 | 8 | . | 4 | 5 |
Subtract using place value:
| Hundreds | Tens | Ones | Tenths | Hundredths | ||
|---|---|---|---|---|---|---|
| 2 | 11 | 6 | 10 | |||
| 131.7 | 1 | 3 | 1 | . | 7 | 0 |
| 28.45 | 2 | 8 | . | 4 | 5 | |
| Difference | 1 | 0 | 3 | . | 2 | 5 |
Column traversal from right to left
Hundredths column:
Hundredths column:
- Since 0 is less than 5, we have to borrow 1 from the Tenths column
- As a result, 0 becomes 10, and 10 − 5 = 5
- The 7 in the Tenths column becomes 6
Tenths column:
- 6 − 4 = 2
Ones column:
- Since 1 is less than 8, we have to borrow 1 from the Tens column
- As a result, 1 becomes 11, and 11 − 8 = 3
- The 3 in the Tens column becomes 2
Tens column:
- 2 − 2 = 0
Hundreds column:
- 1 − 0 = 1
| 2 | 11 | 6 | 10 | |||
| 1 | 3 | 1 | . | 7 | 0 | |
| − | 2 | 8 | . | 4 | 5 | |
| 1 | 0 | 3 | . | 2 | 5 |
Therefore, the Difference between 131.7 and 28.45 is 103.25
Check computation by comparing Larger Number and the Sum of Difference and Smaller Number:
| 1 | 1 | |||||
| 1 | 0 | 3 | . | 2 | 5 | |
| 2 | 8 | . | 4 | 5 | ||
| 1 | 3 | 1 | . | 7 | 0 |
Sum of Difference and Smaller Number = 131.7 (trailing zero is dropped)
Sum of Difference and Smaller Number = Larger Number (131.7 = 131.7) ✓
