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What is the LCM of 84 and 15?

The lcm of 84 and 15 is 420.

Steps to find LCM

  1. Find the prime factorization of 84
    84 = 2 × 2 × 3 × 7
  2. Find the prime factorization of 15
    15 = 3 × 5
  3. Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the lcm:

    LCM = 2 × 2 × 3 × 5 × 7
  4. LCM = 420

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