Solution - Long subtraction
902
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 | 1 | 7 | |
| - | 1 | 1 | 5 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
7-5=2
| Place value | thousands | hundreds | tens | ones |
| 1 | 0 | 1 | 7 | |
| - | 1 | 1 | 5 | |
| 2 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | thousands | hundreds | tens | ones |
| 1 | 0 | 1 | 7 | |
| - | 1 | 1 | 5 | |
| 0 | 2 |
Because the upper digit (0) 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 (10).
| Place value | thousands | hundreds | tens | ones |
| 0 | 10 | |||
| 1 | 0 | 1 | 7 | |
| - | 1 | 1 | 5 | |
| 0 | 2 |
Subtract the numbers in the hundreds column from the top number:
10-1=9
| Place value | thousands | hundreds | tens | ones |
| 0 | 10 | |||
| 1 | 0 | 1 | 7 | |
| - | 1 | 1 | 5 | |
| 9 | 0 | 2 |
Write 0 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 0 | 10 | |||
| 1 | 0 | 1 | 7 | |
| - | 1 | 1 | 5 | |
| 0 | 9 | 0 | 2 |
The solution is: 902
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