GlenCalc

LCM calculator

Enter two or more whole numbers. The LCM is the smallest number they all divide into evenly; it is the lowest common denominator when adding fractions.

Your answer

Least common multiple60

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How we worked it out

Updated as you change the numbers.

  1. LCM(a, b) = a × b ÷ GCF(a, b). For more numbers, LCM(a, b, c) = LCM(LCM(a, b), c).

Method and assumptions

The LCM is computed pairwise with LCM(a, b) = a ÷ GCF(a, b) × b, which avoids building huge products.

Questions

What is the LCM of 4, 6 and 15?

60.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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