Soluzione - Long subtraction
1.511
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 1 | 8 | 0 | 0 | |
| 1 | 2 | 0 | ||
| - | 1 | 6 | 9 | |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (80) which becomes (79) and get (10).
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 10 | ||
| 1 | 8 | 0 | 0 | |
| 1 | 2 | 0 | ||
| - | 1 | 6 | 9 | |
Subtract the numbers in the ones column from the top number:
10-0-9=1
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 10 | ||
| 1 | 8 | 0 | 0 | |
| 1 | 2 | 0 | ||
| - | 1 | 6 | 9 | |
| 1 |
Subtract the numbers in the tens column from the top number:
9-2-6=1
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 10 | ||
| 1 | 8 | 0 | 0 | |
| 1 | 2 | 0 | ||
| - | 1 | 6 | 9 | |
| 1 | 1 |
Subtract the numbers in the hundreds column from the top number:
7-1-1=5
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 10 | ||
| 1 | 8 | 0 | 0 | |
| 1 | 2 | 0 | ||
| - | 1 | 6 | 9 | |
| 5 | 1 | 1 |
Write 1 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 10 | ||
| 1 | 8 | 0 | 0 | |
| 1 | 2 | 0 | ||
| - | 1 | 6 | 9 | |
| 1 | 5 | 1 | 1 |
The solution is: 1,511
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