A twelve-sided die with sides labeled 1 through 12 will be rolled once. Each number is equally likely to be rolled. What is the probability of rolling a number less than 9 ? Write your answer as a fraction.

To find the probability of rolling a number less than 9 on a twelve-sided die, we first identify the favorable outcomes. The numbers less than 9 are 1, 2, 3, 4, 5, 6, 7, and 8, which gives us 8 favorable outcomes. Since the die has a total of 12 sides, the total number of possible outcomes is 12. Thus, the probability is the number of favorable outcomes divided by the total outcomes: \[ \text{Probability} = \frac{8}{12} = \frac{2}{3}. \] So, the probability of rolling a number less than 9 is \(\frac{2}{3}\).