Question 180637
Remember, the LCM of a and b is: 


{{{LCM(a,b)=(a*b)/gcf(a,b)}}}



If "a" and "b" are prime, this means that {{{gcf(a,b)=1}}} (since primes numbers have NO common factors, other than 1, between them)



So {{{LCM(a,b)=(a*b)/gcf(a,b)=(a*b)/1=a*b}}}



This shows us that the LCM of two prime numbers is simply their product.