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What is the LCM of 51 and 20?

The LCM of 51 and 20 is 1020.

Steps to find LCM

  1. Find the prime factorization of 51
    51 = 3 × 17
  2. Find the prime factorization of 20
    20 = 2 × 2 × 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 × 17
  4. LCM = 1020

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