Answers

2016-07-07T22:50:52+08:00
  LCM  of    81 &  117
    first step break down the numbers into its prime numbers
    thus      81    =    3⁴
                117   =   3² * 13
              LCM    =   3⁴ * 13   / disregard the smaller common prime number
                           =  1053
1 5 1