Soluzione - Long subtraction
6.400
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 2 | 1 | |
| - | 1 | 5 | 2 | 1 |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
1-1=0
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 2 | 1 | |
| - | 1 | 5 | 2 | 1 |
| 0 |
Subtract the numbers in the tens column from the top number:
2-2=0
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 2 | 1 | |
| - | 1 | 5 | 2 | 1 |
| 0 | 0 |
Subtract the numbers in the hundreds column from the top number:
9-5=4
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 2 | 1 | |
| - | 1 | 5 | 2 | 1 |
| 4 | 0 | 0 |
Subtract the numbers in the thousands column from the top number:
7-1=6
| Place value | thousands | hundreds | tens | ones |
| 7 | 9 | 2 | 1 | |
| - | 1 | 5 | 2 | 1 |
| 6 | 4 | 0 | 0 |
The solution is: 6,400
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