Soluzione - Long subtraction
19,1
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 2 | 1 | , | 1 | |
| - | 2 | |||
| , |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths |
| 2 | 1 | , | 1 | |
| - | 2 | , | 0 | |
| , |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
1-0=1
| Place value | tens | ones | . | tenths |
| 2 | 1 | , | 1 | |
| - | 2 | , | 0 | |
| , | 1 |
Because the upper digit (1) in the ones 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 (11).
| Place value | tens | ones | . | tenths |
| 1 | 11 | |||
| 2 | 1 | , | 1 | |
| - | 2 | , | 0 | |
| , | 1 |
Subtract the numbers in the ones column from the top number:
11-2=9
| Place value | tens | ones | . | tenths |
| 1 | 11 | |||
| 2 | 1 | , | 1 | |
| - | 2 | , | 0 | |
| 9 | , | 1 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 1 | 11 | |||
| 2 | 1 | , | 1 | |
| - | 2 | , | 0 | |
| 1 | 9 | , | 1 |
The solution is: 19,1
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