How do you find the LCM of 4,30?

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Answer 1 · 2016-12-03T16:04:22

60

List down the prime factors of the numbers. Align any common prime factors

4   : 2 * 2
30 : 2 * 5 * 3

Align the factors common to the two

4   : 2 * 2
30 : 2        * 5 * 3

Bring down all the factors, but count factors common to both numbers once only

4   : 2 * 2
30 : 2        * 5 * 3 
--------------------------
     : 2 * 2 * 5 * 3

Get the resulting product

4   : 2 * 2
30 : 2        * 5 * 3 
--------------------------
     : 2 * 2 * 5 * 3 = 60