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About This Tool
The GCD & LCM Calculator quickly finds the Greatest Common Divisor and Least Common Multiple for any set of positive integers. These are fundamental operations in number theory used in simplifying fractions, solving equations, and working with ratios.
The GCD (also called HCF — Highest Common Factor) is the largest number that divides all given numbers without a remainder. The LCM is the smallest number that is a multiple of all given numbers.
Enter two or more numbers separated by commas and get both values computed instantly using the efficient Euclidean algorithm.