Question

what is the lmc of 4,9,12

Answer 1

the LCM is 36 
if you need me to break it down for you i will 

Answer 2

 LCM is 36
 multiples of 4:
8, 12, 16, 20, 24, 28, 32, 36...

multiples of 9:
18, 27, 36, 45, 54...

 multiples of 12: 
24, 36, 48, 60...