Soluzione - Long subtraction
90,1
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 0 | 0 | |||
| - | 9 | , | 9 | ||
| , |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 0 | 0 | , | 0 | |
| - | 9 | , | 9 | ||
| , |
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 (100) which becomes (099) and get (10).
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | , | 0 | |
| - | 9 | , | 9 | ||
| , |
Subtract the numbers in the tenths column from the top number:
10-0-9=1
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | , | 0 | |
| - | 9 | , | 9 | ||
| , | 1 |
Subtract the numbers in the ones column from the top number:
9-9=0
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | , | 0 | |
| - | 9 | , | 9 | ||
| 0 | , | 1 |
Write 9 in the tens place.
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | , | 0 | |
| - | 9 | , | 9 | ||
| 9 | 0 | , | 1 |
Write 0 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | , | 0 | |
| - | 9 | , | 9 | ||
| 0 | 9 | 0 | , | 1 |
The solution is: 90,1
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