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 (2÷12) 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%