So if you want to get a two or a six your probability would be 2/12 (because a dice has 12 sides) But for these they usually want a fraction so I will show you how to convert it. You start by dividing the top of the fraction by the bottom (2รท12) and then multiply it by 100.
Our finished percentage of the probability of getting a 2 or a six when rolling a dice is 16.667%