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What is the LCM of 420 and 3920?

The LCM of 420 and 3920 is 11760.

Steps to find LCM

  1. Find the prime factorization of 420
    420 = 2 × 2 × 3 × 5 × 7
  2. Find the prime factorization of 3920
    3920 = 2 × 2 × 2 × 2 × 5 × 7 × 7
  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 × 2 × 3 × 5 × 7 × 7
  4. LCM = 11760

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