In more detail
lcm(a, b) = a × b / gcd(a, b), so lcm(12, 18) = 36. It is the common denominator needed to add fractions and the interval after which two repeating cycles line up again.
Glossary
Math & Statistics
Least common multiple (LCM)
The least common multiple of two numbers is the smallest positive number that both divide into evenly.
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See also
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Glossary
Greatest common factor (GCF)
The greatest common factor of two numbers is the largest whole number that divides both without a remainder.