Solution - Long subtraction
1,008
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 1 | 0 | 2 | 3 | |
| - | 1 | 5 | ||
2. Subtract the numbers using long subtraction method
Because the upper digit (3) in the ones column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (13).
| Place value | thousands | hundreds | tens | ones |
| 1 | 13 | |||
| 1 | 0 | 2 | 3 | |
| - | 1 | 5 | ||
Subtract the numbers in the ones column from the top number:
13-5=8
| Place value | thousands | hundreds | tens | ones |
| 1 | 13 | |||
| 1 | 0 | 2 | 3 | |
| - | 1 | 5 | ||
| 8 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | thousands | hundreds | tens | ones |
| 1 | 13 | |||
| 1 | 0 | 2 | 3 | |
| - | 1 | 5 | ||
| 0 | 8 |
Write 0 in the hundreds place.
| Place value | thousands | hundreds | tens | ones |
| 1 | 13 | |||
| 1 | 0 | 2 | 3 | |
| - | 1 | 5 | ||
| 0 | 0 | 8 |
Write 1 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 1 | 13 | |||
| 1 | 0 | 2 | 3 | |
| - | 1 | 5 | ||
| 1 | 0 | 0 | 8 |
The solution is: 1,008
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