Soluzione - Long subtraction
819.909
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | ||||
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 number to the left (2.000) which becomes (1.999) and get (10).
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 9 | 9 | 9 | 10 | ||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | ||||
Subtract the numbers in the ones column from the top number:
10-1=9
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 9 | 9 | 9 | 10 | ||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | ||||
| 9 |
Subtract the numbers in the tens column from the top number:
9-9=0
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 9 | 9 | 9 | 10 | ||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | ||||
| 0 | 9 |
Write 9 in the hundreds place.
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 9 | 9 | 9 | 10 | ||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | ||||
| 9 | 0 | 9 |
Write 9 in the thousands place.
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 9 | 9 | 9 | 10 | ||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | ||||
| 9 | 9 | 0 | 9 |
Write 1 in the ten thousands place.
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 9 | 9 | 9 | 10 | ||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | ||||
| 1 | 9 | 9 | 0 | 9 |
Write 8 in the hundred thousands place.
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 9 | 9 | 9 | 10 | ||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | ||||
| 8 | 1 | 9 | 9 | 0 | 9 |
The solution is: 819,909
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