Solution - Long subtraction
2,096
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 2 | 5 | 8 | 7 | |
| - | 4 | 9 | 1 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
7-1=6
| Place value | thousands | hundreds | tens | ones |
| 2 | 5 | 8 | 7 | |
| - | 4 | 9 | 1 | |
| 6 |
Because the upper digit (8) in the tens column is too small to get a positive difference, borrow 1 from the digit (5) in the next number place which becomes (4) and get (18).
| Place value | thousands | hundreds | tens | ones |
| 4 | 18 | |||
| 2 | 5 | 8 | 7 | |
| - | 4 | 9 | 1 | |
| 6 |
Subtract the numbers in the tens column from the top number:
18-9=9
| Place value | thousands | hundreds | tens | ones |
| 4 | 18 | |||
| 2 | 5 | 8 | 7 | |
| - | 4 | 9 | 1 | |
| 9 | 6 |
Subtract the numbers in the hundreds column from the top number:
4-4=0
| Place value | thousands | hundreds | tens | ones |
| 4 | 18 | |||
| 2 | 5 | 8 | 7 | |
| - | 4 | 9 | 1 | |
| 0 | 9 | 6 |
Write 2 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 4 | 18 | |||
| 2 | 5 | 8 | 7 | |
| - | 4 | 9 | 1 | |
| 2 | 0 | 9 | 6 |
The solution is: 2,096
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