Soluzione - Long subtraction
1.169
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones |
| 1 | 2 | 3 | 9 | |
| - | 7 | 0 | ||
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
9-0=9
| Place value | thousands | hundreds | tens | ones |
| 1 | 2 | 3 | 9 | |
| - | 7 | 0 | ||
| 9 |
Because the upper digit (3) in the tens column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (13).
| Place value | thousands | hundreds | tens | ones |
| 1 | 13 | |||
| 1 | 2 | 3 | 9 | |
| - | 7 | 0 | ||
| 9 |
Subtract the numbers in the tens column from the top number:
13-7=6
| Place value | thousands | hundreds | tens | ones |
| 1 | 13 | |||
| 1 | 2 | 3 | 9 | |
| - | 7 | 0 | ||
| 6 | 9 |
Write 1 in the hundreds place.
| Place value | thousands | hundreds | tens | ones |
| 1 | 13 | |||
| 1 | 2 | 3 | 9 | |
| - | 7 | 0 | ||
| 1 | 6 | 9 |
Write 1 in the thousands place.
| Place value | thousands | hundreds | tens | ones |
| 1 | 13 | |||
| 1 | 2 | 3 | 9 | |
| - | 7 | 0 | ||
| 1 | 1 | 6 | 9 |
The solution is: 1,169
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