Soluzione - Long subtraction
129
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 1 | 5 | 4 | |
| 7 | |||
| - | 1 | 8 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (4) in the ones column is too small to get a positive difference, borrow 2 from the digit (5) in the next number place which becomes (3) and get (24).
| Place value | hundreds | tens | ones |
| 3 | 24 | ||
| 1 | 5 | 4 | |
| 7 | |||
| - | 1 | 8 | |
Subtract the numbers in the ones column from the top number:
24-7-8=9
| Place value | hundreds | tens | ones |
| 3 | 24 | ||
| 1 | 5 | 4 | |
| 7 | |||
| - | 1 | 8 | |
| 9 |
Subtract the numbers in the tens column from the top number:
3-1=2
| Place value | hundreds | tens | ones |
| 3 | 24 | ||
| 1 | 5 | 4 | |
| 7 | |||
| - | 1 | 8 | |
| 2 | 9 |
Write 1 in the hundreds place.
| Place value | hundreds | tens | ones |
| 3 | 24 | ||
| 1 | 5 | 4 | |
| 7 | |||
| - | 1 | 8 | |
| 1 | 2 | 9 |
The solution is: 129
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