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What is the LCM of 20 and 40?

The lcm of 20 and 40 is 40.

Steps to find LCM

  1. Find the prime factorization of 20
    20 = 2 × 2 × 5
  2. Find the prime factorization of 40
    40 = 2 × 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 × 2 × 5
  4. LCM = 40

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