Question 1147560
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Integer number 63 has the following decomposition into the product of prime numbers

    63 = 9*7 = {{{3^2*7}}}.        (1)



Integer number 84 has the following decomposition into the product of prime numbers

    84 = 12*7 = {{{2^2*3*7}}}.      (2)



The LCM should have any of this prime numbers, 2, 3, and 7 in degrees what are maximal for each prime 
among these two decomposition (1) and (2).  



So      LCM(63,84) = {{{2^2*3^2*7}}} = 252.      <U>ANSWER</U>
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