Soluzione - Long subtraction
3.972
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 7 | 8 | 0 | 2 | |
| - | 3 | 8 | 3 | 0 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
2-0=2
| Place value | thousands | hundreds | tens | ones |
| 7 | 8 | 0 | 2 | |
| - | 3 | 8 | 3 | 0 |
| 2 |
Because the upper digit (0) in the tens column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (10).
| Place value | thousands | hundreds | tens | ones |
| 7 | 10 | |||
| 7 | 8 | 0 | 2 | |
| - | 3 | 8 | 3 | 0 |
| 2 |
Subtract the numbers in the tens column from the top number:
10-3=7
| Place value | thousands | hundreds | tens | ones |
| 7 | 10 | |||
| 7 | 8 | 0 | 2 | |
| - | 3 | 8 | 3 | 0 |
| 7 | 2 |
Because the upper digit (7) in the hundreds column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (17).
| Place value | thousands | hundreds | tens | ones |
| 6 | 17 | |||
| 7 | 10 | |||
| 7 | 8 | 0 | 2 | |
| - | 3 | 8 | 3 | 0 |
| 7 | 2 |
Subtract the numbers in the hundreds column from the top number:
17-8=9
| Place value | thousands | hundreds | tens | ones |
| 6 | 17 | |||
| 7 | 10 | |||
| 7 | 8 | 0 | 2 | |
| - | 3 | 8 | 3 | 0 |
| 9 | 7 | 2 |
Subtract the numbers in the thousands column from the top number:
6-3=3
| Place value | thousands | hundreds | tens | ones |
| 6 | 17 | |||
| 7 | 10 | |||
| 7 | 8 | 0 | 2 | |
| - | 3 | 8 | 3 | 0 |
| 3 | 9 | 7 | 2 |
The solution is: 3,972
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