Soluzione - Long subtraction
340
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 9 | 1 | 9 | |
| - | 5 | 7 | 9 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
9-9=0
| Place value | hundreds | tens | ones |
| 9 | 1 | 9 | |
| - | 5 | 7 | 9 |
| 0 |
Because the upper digit (1) 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 (11).
| Place value | hundreds | tens | ones |
| 8 | 11 | ||
| 9 | 1 | 9 | |
| - | 5 | 7 | 9 |
| 0 |
Subtract the numbers in the tens column from the top number:
11-7=4
| Place value | hundreds | tens | ones |
| 8 | 11 | ||
| 9 | 1 | 9 | |
| - | 5 | 7 | 9 |
| 4 | 0 |
Subtract the numbers in the hundreds column from the top number:
8-5=3
| Place value | hundreds | tens | ones |
| 8 | 11 | ||
| 9 | 1 | 9 | |
| - | 5 | 7 | 9 |
| 3 | 4 | 0 |
The solution is: 340
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