Question 555329
First, list the prime factorization of each number. If you need help with prime factorization, check out this <a href="http://www.algebra.com/algebra/homework/divisibility/factor-any-number.solver">solver</a>.



84: 2*2*3*7



138: 2*3*23



Now highlight the unique factors. Remember, highlight the factors that occur most frequently



84: <font color="red">2*2</font>*<font color="red">3</font>*<font color="red">7</font>



138: 2*3*<font color="red">23</font>



Now multiply all of the highlighted factors


2*2*3*7*23=1932


So the LCM of 84 and  138  is 1932


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