Description: Sal divides wholes into equal-sized pieces to create unit fractions. Created by Sal Khan. Now, what I'm going to do is divide this into 4 equal parts. And now what I'm going to do is I'm going to select one of those equal parts, so let's say this part right over here. Well, it is 1 out of the 4 equal parts, right?*Teacher Advisor is 100% free.