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You are watching: What is the lcm of 3 and 21

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We think you wrote:

lcm(3,15,21)

This encounters the least typical multiple (LCM) by prime factorization.


1. find the prime factors of 3

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2. discover the prime determinants of 15

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Tree view of the prime factors of 15: 3 and 5

The prime factors of 15 are 3 and also 5.


Determine the maximum number of times every prime variable (3, 5, 7) occurs in the administer of the offered numbers: