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The best way to find the least common multiple of 3 numbers is to find it of the biggest two, then find the LCM of that answer with the third number.

LCM(a,b) = (ab)/GCF(a,b)

12 factors to [2 2 3]

8 factors to [2 2 2]

common factors are [2 2] = 4

12 * 8 / 4 = 24

Since 5 is prime and not a factor of 24, the GCF(5,24)=1 ("relatively prime")

LCM = 24 * 5 / 1 = 120■

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15y ago
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