Soluzione - Long subtraction
908
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 9 | 1 | 7 | 8 | |
| - | 8 | 2 | 7 | 0 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
8-0=8
| Place value | thousands | hundreds | tens | ones |
| 9 | 1 | 7 | 8 | |
| - | 8 | 2 | 7 | 0 |
| 8 |
Subtract the numbers in the tens column from the top number:
7-7=0
| Place value | thousands | hundreds | tens | ones |
| 9 | 1 | 7 | 8 | |
| - | 8 | 2 | 7 | 0 |
| 0 | 8 |
Because the upper digit (1) in the hundreds 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 (11).
| Place value | thousands | hundreds | tens | ones |
| 8 | 11 | |||
| 9 | 1 | 7 | 8 | |
| - | 8 | 2 | 7 | 0 |
| 0 | 8 |
Subtract the numbers in the hundreds column from the top number:
11-2=9
| Place value | thousands | hundreds | tens | ones |
| 8 | 11 | |||
| 9 | 1 | 7 | 8 | |
| - | 8 | 2 | 7 | 0 |
| 9 | 0 | 8 |
Subtract the numbers in the thousands column from the top number:
8-8=0
| Place value | thousands | hundreds | tens | ones |
| 8 | 11 | |||
| 9 | 1 | 7 | 8 | |
| - | 8 | 2 | 7 | 0 |
| 0 | 9 | 0 | 8 |
The solution is: 908
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