Soluzione - Long subtraction
802
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| 8 | 4 | 0 | |
| - | 3 | 8 | |
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 digit (4) in the next number place which becomes (3) and get (10).
| Place value | hundreds | tens | ones |
| 3 | 10 | ||
| 8 | 4 | 0 | |
| - | 3 | 8 | |
Subtract the numbers in the ones column from the top number:
10-8=2
| Place value | hundreds | tens | ones |
| 3 | 10 | ||
| 8 | 4 | 0 | |
| - | 3 | 8 | |
| 2 |
Subtract the numbers in the tens column from the top number:
3-3=0
| Place value | hundreds | tens | ones |
| 3 | 10 | ||
| 8 | 4 | 0 | |
| - | 3 | 8 | |
| 0 | 2 |
Write 8 in the hundreds place.
| Place value | hundreds | tens | ones |
| 3 | 10 | ||
| 8 | 4 | 0 | |
| - | 3 | 8 | |
| 8 | 0 | 2 |
The solution is: 802
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