Soluzione - Long subtraction
79.999.998
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 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
2. Subtract the numbers using long subtraction method
Because the upper digit (3) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (8.000.000) which becomes (7.999.999) and get (13).
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 13 | |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
Subtract the numbers in the ones column from the top number:
13-5=8
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 13 | |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
| 8 |
Write 9 in the tens place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 13 | |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
| 9 | 8 |
Write 9 in the hundreds place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 13 | |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
| 9 | 9 | 8 |
Write 9 in the thousands place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 13 | |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
| 9 | 9 | 9 | 8 |
Write 9 in the ten thousands place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 13 | |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
| 9 | 9 | 9 | 9 | 8 |
Write 9 in the hundred thousands place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 13 | |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
| 9 | 9 | 9 | 9 | 9 | 8 |
Write 9 in the millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 13 | |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
| 9 | 9 | 9 | 9 | 9 | 9 | 8 |
Write 7 in the ten millions place.
| Place value | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 13 | |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | |
| - | 5 | |||||||
| 7 | 9 | 9 | 9 | 9 | 9 | 9 | 8 |
The solution is: 79,999,998
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