So an example
 
 least common multipule is like what is the smallest number both will fit into
 
 example, 6 and 10, least common multilule is 30 because 6*5=30 and 3*10=30
 
 so 3 and 4
 factor each
 3=3
 4=2*2
 so we have to have 2*2*3 which is 12
 
 12 is least common multiplule