Soluzione - Long subtraction
0,4
Spiegazione passo passo
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 2 | 0 | , | 3 | |
| - | 1 | 9 | , | 9 |
| , |
2. Subtract the numbers using long subtraction method
Because the upper digit (3) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (20) which becomes (19) and get (13).
| Place value | tens | ones | . | tenths |
| 1 | 13 | |||
| 2 | 0 | , | 3 | |
| - | 1 | 9 | , | 9 |
| , |
Subtract the numbers in the tenths column from the top number:
13-9=4
| Place value | tens | ones | . | tenths |
| 1 | 13 | |||
| 2 | 0 | , | 3 | |
| - | 1 | 9 | , | 9 |
| , | 4 |
Subtract the numbers in the ones column from the top number:
9-9=0
| Place value | tens | ones | . | tenths |
| 1 | 13 | |||
| 2 | 0 | , | 3 | |
| - | 1 | 9 | , | 9 |
| 0 | , | 4 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | tens | ones | . | tenths |
| 1 | 13 | |||
| 2 | 0 | , | 3 | |
| - | 1 | 9 | , | 9 |
| 0 | 0 | , | 4 |
The solution is: 0,4
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