The LCM of 60 and 84 is 420.
the prime factors of 60 are 2,2,3,5
the prime factors of 84 are 2,2,3,7
combining them all together to use all the factors = 2,2,3,5,7 = 420
Take the greatest QUANTITY of each number. so we have 2 - 2's , 1 - 3 , 1 - 5 , and 1 - 7. 2 x 2 x 3 x 5 x 7 = 420
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