Soluzione - Long subtraction
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 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 | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 0 |
Subtract the numbers in the tens column from the top number:
0-0=0
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 0 | 0 |
Subtract the numbers in the hundreds column from the top number:
0-0=0
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 |
Subtract the numbers in the thousands column from the top number:
0-0=0
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 0 |
Because the upper digit (0) in the ten thousands column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (10).
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 10 | |||||||
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 0 |
Subtract the numbers in the ten thousands column from the top number:
10-1=9
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 0 | 10 | |||||||
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 9 | 0 | 0 | 0 | 0 |
Because the upper digit (0) in the hundred thousands column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (10).
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||
| 0 | 10 | |||||||
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 9 | 0 | 0 | 0 | 0 |
Subtract the numbers in the hundred thousands column from the top number:
10-9=1
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||
| 0 | 10 | |||||||
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 1 | 9 | 0 | 0 | 0 | 0 |
Subtract the numbers in the millions column from the top number:
8-8=0
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||
| 0 | 10 | |||||||
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 0 | 1 | 9 | 0 | 0 | 0 | 0 |
Write 8 in the ten millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 8 | 10 | |||||||
| 0 | 10 | |||||||
| 8 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | |
| - | 8 | 9 | 1 | 0 | 0 | 0 | 0 | |
| 8 | 0 | 1 | 9 | 0 | 0 | 0 | 0 |
The solution is: 80,190,000
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