Soluzione - Long subtraction
2.289
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 2 | 3 | 1 | 3 | |
| 7 | ||||
| - | 1 | 7 | ||
2. Subtract the numbers using long subtraction method
Because the upper digit (3) in the ones column is too small to get a positive difference, borrow 2 from the number to the left (31) which becomes (29) and get (23).
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 23 | ||
| 2 | 3 | 1 | 3 | |
| 7 | ||||
| - | 1 | 7 | ||
Subtract the numbers in the ones column from the top number:
23-7-7=9
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 23 | ||
| 2 | 3 | 1 | 3 | |
| 7 | ||||
| - | 1 | 7 | ||
| 9 |
Subtract the numbers in the tens column from the top number:
9-1=8
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 23 | ||
| 2 | 3 | 1 | 3 | |
| 7 | ||||
| - | 1 | 7 | ||
| 8 | 9 |
Write 2 in the hundreds place.
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 23 | ||
| 2 | 3 | 1 | 3 | |
| 7 | ||||
| - | 1 | 7 | ||
| 2 | 8 | 9 |
Write 2 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 23 | ||
| 2 | 3 | 1 | 3 | |
| 7 | ||||
| - | 1 | 7 | ||
| 2 | 2 | 8 | 9 |
The solution is: 2,289
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