Soluzione - Long subtraction
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 | 0 | 0 | 0 | |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the ones column from the top number:
0-0=0
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | 0 | 0 | 0 | |
| 0 |
Subtract the numbers in the tens column from the top number:
0-0=0
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | 0 | 0 | 0 | |
| 0 | 0 |
Subtract the numbers in the hundreds column from the top number:
0-0=0
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | 0 | 0 | 0 | |
| 0 | 0 | 0 |
Because the upper digit (0) in the thousands 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 (10).
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 10 | |||||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | 0 | 0 | 0 | |
| 0 | 0 | 0 |
Subtract the numbers in the thousands column from the top number:
10-1=9
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | 10 | |||||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | 0 | 0 | 0 | |
| 9 | 0 | 0 | 0 |
Because the upper digit (1) in the ten thousands column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (11).
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 11 | |||||
| 1 | 10 | |||||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | 0 | 0 | 0 | |
| 9 | 0 | 0 | 0 |
Subtract the numbers in the ten thousands column from the top number:
11-9=2
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 11 | |||||
| 1 | 10 | |||||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | 0 | 0 | 0 | |
| 2 | 9 | 0 | 0 | 0 |
Write 7 in the hundred thousands place.
| Place value | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 11 | |||||
| 1 | 10 | |||||
| 8 | 2 | 0 | 0 | 0 | 0 | |
| - | 9 | 1 | 0 | 0 | 0 | |
| 7 | 2 | 9 | 0 | 0 | 0 |
The solution is: 729,000
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