Soluzione - Long subtraction
5.879
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 9 | 0 | 0 | 7 | |
| - | 3 | 1 | 2 | 8 |
2. Subtract the numbers using long subtraction method
Because the upper digit (7) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (900) which becomes (899) and get (17).
| Place value | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 17 | |
| 9 | 0 | 0 | 7 | |
| - | 3 | 1 | 2 | 8 |
Subtract the numbers in the ones column from the top number:
17-8=9
| Place value | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 17 | |
| 9 | 0 | 0 | 7 | |
| - | 3 | 1 | 2 | 8 |
| 9 |
Subtract the numbers in the tens column from the top number:
9-2=7
| Place value | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 17 | |
| 9 | 0 | 0 | 7 | |
| - | 3 | 1 | 2 | 8 |
| 7 | 9 |
Subtract the numbers in the hundreds column from the top number:
9-1=8
| Place value | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 17 | |
| 9 | 0 | 0 | 7 | |
| - | 3 | 1 | 2 | 8 |
| 8 | 7 | 9 |
Subtract the numbers in the thousands column from the top number:
8-3=5
| Place value | thousands | hundreds | tens | ones |
| 8 | 9 | 9 | 17 | |
| 9 | 0 | 0 | 7 | |
| - | 3 | 1 | 2 | 8 |
| 5 | 8 | 7 | 9 |
The solution is: 5,879
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