Question

Find the lcm of 28,42 and 56 by using prime factorisation method.​

Answer 1

To find :

find the LCM of 28, 42 and 56

Solution :

factors of 28 = 1, 28 , 2 , 14 , 7 , 4

factors of 42 = 1 , 42 , 2 , 21 , 3 , 7

factors of 56 = 1 ,56, 2, 28, 14, 4, 7, 8

28 and 56 are related and their LCM is 168.

So, now lets look at 42 and 56

its also 168

So, 168 is the answer