You can put this solution on YOUR website! Each die has numbers 1 to 6.
There are 3 prime numbers per die. The prime numbers are 2, 3 and 5 for each die. This means there are 6 prime numbers in total from a list of 12 possibilities.
Let P = probability
P(rolling a prime) = (what we want)/(total number of possible outcomes)
P(rolling a prime) = 6/12 or 1/2