Use subtraction:
8500 - 365:
Line up our numbers vertically:
| 8 | 5 | 0 | 0 | |
| _ | 3 | 6 | 5 |
| 10 | ||||
| 8 | 5 | 0 | ||
| _ | 3 | 6 | 5 | 5 |
Column 1:
0 - 5 is < 0, we need to borrow 10.
Column 1: 10 + 0 - 5 = 5
| 9 | 10 | |||
| 8 | 5 | |||
| _ | 3 | 6 | 5 | 3 | 5 |
Column 2: 0 - 6 is <= 0, and we needed to borrow on the last column.
Therefore, we need to subtract 1 for the borrow in the previous column, and then add 10 for another borrow for this column. Total borrowing is 10 - 1 = 9.
Column 2: 9 + 0 - 6 = 3
| 4 | 9 | 10 | ||
| 8 | ||||
| _ | 3 | 6 | 5 | 1 | 3 | 5 |
Column 3:
Since we borrowed on the last column, we take it out of 5
Column 3: 5 - 1 - 3 = 1
| 4 | 9 | 10 | ||
| 8 | ||||
| _ | 3 | 6 | 5 | 8 | 1 | 3 | 5 |
Column 4: 8 - 0 = 8
Final Answer
Answer = 8500 - 365 = 8135
