Solution - Long subtraction
8,587
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 8 | 7 | 6 | 5 | |
| - | 1 | 7 | 8 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (5) in the ones column is too small to get a positive difference, borrow 1 from the digit (6) in the next number place which becomes (5) and get (15).
| Place value | thousands | hundreds | tens | ones |
| 5 | 15 | |||
| 8 | 7 | 6 | 5 | |
| - | 1 | 7 | 8 | |
Subtract the numbers in the ones column from the top number:
15-8=7
| Place value | thousands | hundreds | tens | ones |
| 5 | 15 | |||
| 8 | 7 | 6 | 5 | |
| - | 1 | 7 | 8 | |
| 7 |
Because the upper digit (5) in the tens column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (15).
| Place value | thousands | hundreds | tens | ones |
| 6 | 15 | |||
| 5 | 15 | |||
| 8 | 7 | 6 | 5 | |
| - | 1 | 7 | 8 | |
| 7 |
Subtract the numbers in the tens column from the top number:
15-7=8
| Place value | thousands | hundreds | tens | ones |
| 6 | 15 | |||
| 5 | 15 | |||
| 8 | 7 | 6 | 5 | |
| - | 1 | 7 | 8 | |
| 8 | 7 |
Subtract the numbers in the hundreds column from the top number:
6-1=5
| Place value | thousands | hundreds | tens | ones |
| 6 | 15 | |||
| 5 | 15 | |||
| 8 | 7 | 6 | 5 | |
| - | 1 | 7 | 8 | |
| 5 | 8 | 7 |
Write 8 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 6 | 15 | |||
| 5 | 15 | |||
| 8 | 7 | 6 | 5 | |
| - | 1 | 7 | 8 | |
| 8 | 5 | 8 | 7 |
The solution is: 8,587
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