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Here's another one:

Find the LCM of6and 10.
 
6 :  6 , 12 , 18 , 24 , ( 30 ) , 36 , 42 , ...
10 :  10 , 20 , ( 30 ) , 40 , 50 , ...  Grab the first common guy!

 
LCM( 6 , 10 ) = 30

 


YOUR TURN:

LCM( 2 , 7 )
 

LCM( 16 , 24 )
 

LCM( 2 , 4 , 6 )