Solutions by everydaycalculation.com

The LCM of 15 and 42 is 210.

- Find the prime factorization of 15

15 = 3 × 5 - Find the prime factorization of 42

42 = 2 × 3 × 7 - Multiply each factor the greater number of times it occurs in steps i) or ii) above to find the LCM:

LCM = 2 × 3 × 5 × 7 - LCM =
**210**

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Find least common multiple (LCM) of: 30 & 84 45 & 126 5 & 14 75 & 210 105 & 294 30 & 42 15 & 84 45 & 42 15 & 126 75 & 42 15 & 210 105 & 42 15 & 294

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