Soluzione - Long subtraction
69
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones |
| 9 | 1 | |
| 7 | ||
| - | 1 | 5 |
2. Subtract the numbers using long subtraction method
Because the upper digit (1) in the ones column is too small to get a positive difference, borrow 2 from the digit (9) in the next number place which becomes (7) and get (21).
| Place value | tens | ones |
| 7 | 21 | |
| 9 | 1 | |
| 7 | ||
| - | 1 | 5 |
Subtract the numbers in the ones column from the top number:
21-7-5=9
| Place value | tens | ones |
| 7 | 21 | |
| 9 | 1 | |
| 7 | ||
| - | 1 | 5 |
| 9 |
Subtract the numbers in the tens column from the top number:
7-1=6
| Place value | tens | ones |
| 7 | 21 | |
| 9 | 1 | |
| 7 | ||
| - | 1 | 5 |
| 6 | 9 |
The solution is: 69
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