| ```python | |
| def truncate_number(number: float) -> float: | |
| """ Given a positive floating point number, it can be decomposed into | |
| and integer part (largest integer smaller than given number) and decimals | |
| (leftover part always smaller than 1). | |
| Return the decimal part of the number. | |
| >>> truncate_number(3.5) | |
| 0.5 | |
| """ | |
| return number % 1 | |
| ``` |