Solution - Long subtraction
985
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 1 | 8 | 1 | 5 | |
| - | 8 | 3 | 0 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
5-0=5
| Place value | thousands | hundreds | tens | ones |
| 1 | 8 | 1 | 5 | |
| - | 8 | 3 | 0 | |
| 5 |
Because the upper digit (1) in the tens column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (11).
| Place value | thousands | hundreds | tens | ones |
| 7 | 11 | |||
| 1 | 8 | 1 | 5 | |
| - | 8 | 3 | 0 | |
| 5 |
Subtract the numbers in the tens column from the top number:
11-3=8
| Place value | thousands | hundreds | tens | ones |
| 7 | 11 | |||
| 1 | 8 | 1 | 5 | |
| - | 8 | 3 | 0 | |
| 8 | 5 |
Because the upper digit (7) in the hundreds column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (17).
| Place value | thousands | hundreds | tens | ones |
| 0 | 17 | |||
| 7 | 11 | |||
| 1 | 8 | 1 | 5 | |
| - | 8 | 3 | 0 | |
| 8 | 5 |
Subtract the numbers in the hundreds column from the top number:
17-8=9
| Place value | thousands | hundreds | tens | ones |
| 0 | 17 | |||
| 7 | 11 | |||
| 1 | 8 | 1 | 5 | |
| - | 8 | 3 | 0 | |
| 9 | 8 | 5 |
Write 0 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 0 | 17 | |||
| 7 | 11 | |||
| 1 | 8 | 1 | 5 | |
| - | 8 | 3 | 0 | |
| 0 | 9 | 8 | 5 |
The solution is: 985
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