Solution - Long subtraction
647
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 9 | 3 | 5 | |
| - | 2 | 8 | 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 (3) in the next number place which becomes (2) and get (15).
| Place value | hundreds | tens | ones |
| 2 | 15 | ||
| 9 | 3 | 5 | |
| - | 2 | 8 | 8 |
Subtract the numbers in the ones column from the top number:
15-8=7
| Place value | hundreds | tens | ones |
| 2 | 15 | ||
| 9 | 3 | 5 | |
| - | 2 | 8 | 8 |
| 7 |
Because the upper digit (2) in the tens column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (12).
| Place value | hundreds | tens | ones |
| 8 | 12 | ||
| 2 | 15 | ||
| 9 | 3 | 5 | |
| - | 2 | 8 | 8 |
| 7 |
Subtract the numbers in the tens column from the top number:
12-8=4
| Place value | hundreds | tens | ones |
| 8 | 12 | ||
| 2 | 15 | ||
| 9 | 3 | 5 | |
| - | 2 | 8 | 8 |
| 4 | 7 |
Subtract the numbers in the hundreds column from the top number:
8-2=6
| Place value | hundreds | tens | ones |
| 8 | 12 | ||
| 2 | 15 | ||
| 9 | 3 | 5 | |
| - | 2 | 8 | 8 |
| 6 | 4 | 7 |
The solution is: 647
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