GCD & LCM Calculator
Enter two or more numbers separated by commas to find their greatest common divisor and least common multiple.
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—GCD
—LCM
What these mean
GCD (greatest common divisor) is the largest number that divides evenly into all the given numbers — useful for simplifying fractions. LCM (least common multiple) is the smallest number that all the given numbers divide into evenly — useful for finding common denominators or syncing repeating cycles.