Soluzione - Long subtraction
999,8
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 1 | 0 | 0 | 0 | |||
| - | 0 | , | 2 | |||
| , |
Put zeros in the blank number places:
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 1 | 0 | 0 | 0 | , | 0 | |
| - | 0 | , | 2 | |||
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (1.000) which becomes (0999) and get (10).
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 0 | 9 | 9 | 10 | |||
| 1 | 0 | 0 | 0 | , | 0 | |
| - | 0 | , | 2 | |||
| , |
Subtract the numbers in the tenths column from the top number:
10-0-2=8
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 0 | 9 | 9 | 10 | |||
| 1 | 0 | 0 | 0 | , | 0 | |
| - | 0 | , | 2 | |||
| , | 8 |
Subtract the numbers in the ones column from the top number:
9-0=9
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 0 | 9 | 9 | 10 | |||
| 1 | 0 | 0 | 0 | , | 0 | |
| - | 0 | , | 2 | |||
| 9 | , | 8 |
Write 9 in the tens place.
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 0 | 9 | 9 | 10 | |||
| 1 | 0 | 0 | 0 | , | 0 | |
| - | 0 | , | 2 | |||
| 9 | 9 | , | 8 |
Write 9 in the hundreds place.
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 0 | 9 | 9 | 10 | |||
| 1 | 0 | 0 | 0 | , | 0 | |
| - | 0 | , | 2 | |||
| 9 | 9 | 9 | , | 8 |
Write 0 in the thousands place.
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 0 | 9 | 9 | 10 | |||
| 1 | 0 | 0 | 0 | , | 0 | |
| - | 0 | , | 2 | |||
| 0 | 9 | 9 | 9 | , | 8 |
The solution is: 999,8
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