The greatest common divisor (GCD) is traditionally defined only for integers, making it inapplicable to decimals and fractions without further definitions. If fractions or irrational numbers are considered, any non-zero number can serve as a common divisor or multiple, eliminating the concepts of "least" or "greatest." A proposed solution involves defining a divisor for positive rational numbers, where x divides y if y/x is an integer. This allows for the potential calculation of GCD and least common multiple (LCM) under this new framework. Therefore, while traditional GCD calculations do not extend to decimals and fractions, alternative definitions can facilitate their computation.