Solutions by everydaycalculation.com

The LCM of 3 and 7 is 21.

- Find the prime factorization of 3

3 = 3 - Find the prime factorization of 7

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

LCM = 3 × 7 - LCM =
**21**

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Find least common multiple (LCM) of: 6 & 14 9 & 21 15 & 35 21 & 49 6 & 7 3 & 14 9 & 7 3 & 21 15 & 7 3 & 35 21 & 7 3 & 49

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