View more at http://www.MathTutorDVD.com. In this lesson, you will learn that radical expressions can always be written as a fractional exponent. The exponent 1/2 corresponds to square roots, 1/3 corresponds to cube roots, 1/4 corresponds to 4th roots, and so on. We will discuss why this is the case so that we can use it later for the properties of multiplying and dividing radicals.