Use prime factors to find the LCM of 168 and 252. LCM=.........=...............

Question

LCM=.........=...............

Answer 1

168 = 2 x 2 x 2 x 3 x 7

252 = 2 x 2 x 3 x 3 x 7

 

First you take ONE copy of each of The common factors:

  2 x 2 x 3 x 7

 

Then you take one copy of each of the stray, non-common factors:

There is an extra 2 from the 168 and an extra 3 from the 252.

 

2 x 2 x 3 x 7 x 2 x 3 = 504

 

 

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