Soluzione - Long subtraction
199,5
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths |
| 2 | 1 | 0 | , | 5 | |
| - | 1 | 1 | |||
| , |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths |
| 2 | 1 | 0 | , | 5 | |
| - | 1 | 1 | , | 0 | |
| , |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
5-0=5
| Place value | hundreds | tens | ones | . | tenths |
| 2 | 1 | 0 | , | 5 | |
| - | 1 | 1 | , | 0 | |
| , | 5 |
Because the upper digit (0) in the ones 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 | hundreds | tens | ones | . | tenths |
| 0 | 10 | ||||
| 2 | 1 | 0 | , | 5 | |
| - | 1 | 1 | , | 0 | |
| , | 5 |
Subtract the numbers in the ones column from the top number:
10-1=9
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 10 | ||||
| 2 | 1 | 0 | , | 5 | |
| - | 1 | 1 | , | 0 | |
| 9 | , | 5 |
Because the upper digit (0) in the tens 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 | hundreds | tens | ones | . | tenths |
| 1 | 10 | ||||
| 0 | 10 | ||||
| 2 | 1 | 0 | , | 5 | |
| - | 1 | 1 | , | 0 | |
| 9 | , | 5 |
Subtract the numbers in the tens column from the top number:
10-1=9
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 10 | ||||
| 0 | 10 | ||||
| 2 | 1 | 0 | , | 5 | |
| - | 1 | 1 | , | 0 | |
| 9 | 9 | , | 5 |
Write 1 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 10 | ||||
| 0 | 10 | ||||
| 2 | 1 | 0 | , | 5 | |
| - | 1 | 1 | , | 0 | |
| 1 | 9 | 9 | , | 5 |
The solution is: 199,5
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