What is the LCM of 7 and 20?

The lcm of 7 and 20 is 140.

Steps to find LCM

  1. Find the prime factorization of 7
    7 = 7
  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 × 5 × 7
  4. LCM = 140

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