Soluzione - Long subtraction
1.314
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 4 | 3 | 0 | 1 | |
| - | 2 | 9 | 8 | 7 |
2. Subtract the numbers using long subtraction method
Because the upper digit (1) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (30) which becomes (29) and get (11).
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 11 | ||
| 4 | 3 | 0 | 1 | |
| - | 2 | 9 | 8 | 7 |
Subtract the numbers in the ones column from the top number:
11-7=4
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 11 | ||
| 4 | 3 | 0 | 1 | |
| - | 2 | 9 | 8 | 7 |
| 4 |
Subtract the numbers in the tens column from the top number:
9-8=1
| Place value | thousands | hundreds | tens | ones |
| 2 | 9 | 11 | ||
| 4 | 3 | 0 | 1 | |
| - | 2 | 9 | 8 | 7 |
| 1 | 4 |
Because the upper digit (2) in the hundreds 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 (12).
| Place value | thousands | hundreds | tens | ones |
| 3 | 12 | |||
| 2 | 9 | 11 | ||
| 4 | 3 | 0 | 1 | |
| - | 2 | 9 | 8 | 7 |
| 1 | 4 |
Subtract the numbers in the hundreds column from the top number:
12-9=3
| Place value | thousands | hundreds | tens | ones |
| 3 | 12 | |||
| 2 | 9 | 11 | ||
| 4 | 3 | 0 | 1 | |
| - | 2 | 9 | 8 | 7 |
| 3 | 1 | 4 |
Subtract the numbers in the thousands column from the top number:
3-2=1
| Place value | thousands | hundreds | tens | ones |
| 3 | 12 | |||
| 2 | 9 | 11 | ||
| 4 | 3 | 0 | 1 | |
| - | 2 | 9 | 8 | 7 |
| 1 | 3 | 1 | 4 |
The solution is: 1,314
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