Solution - Long subtraction
1,125
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 2 | 3 | 1 | 5 | |
| - | 1 | 1 | 9 | 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 |
| 2 | 3 | 1 | 5 | |
| - | 1 | 1 | 9 | 0 |
| 5 |
Because the upper digit (1) in the tens column is too small to get a positive difference, borrow 1 from the digit (3) in the next number place which becomes (2) and get (11).
| Place value | thousands | hundreds | tens | ones |
| 2 | 11 | |||
| 2 | 3 | 1 | 5 | |
| - | 1 | 1 | 9 | 0 |
| 5 |
Subtract the numbers in the tens column from the top number:
11-9=2
| Place value | thousands | hundreds | tens | ones |
| 2 | 11 | |||
| 2 | 3 | 1 | 5 | |
| - | 1 | 1 | 9 | 0 |
| 2 | 5 |
Subtract the numbers in the hundreds column from the top number:
2-1=1
| Place value | thousands | hundreds | tens | ones |
| 2 | 11 | |||
| 2 | 3 | 1 | 5 | |
| - | 1 | 1 | 9 | 0 |
| 1 | 2 | 5 |
Subtract the numbers in the thousands column from the top number:
2-1=1
| Place value | thousands | hundreds | tens | ones |
| 2 | 11 | |||
| 2 | 3 | 1 | 5 | |
| - | 1 | 1 | 9 | 0 |
| 1 | 1 | 2 | 5 |
The solution is: 1,125
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