FRACTIONS
A fraction (sometimes, a common fraction) is a way of expressing a number that is a ratio of two integers:
P
-
q or p / q or even as p ÷ q.
The top (or the first) number is called the numerator, the bottom (or the second) number is called the denominator. The numerator answers the question, How many? The denominator specifies the answer to that question, How many of what? Accordingly, "p/q" is pronounced "p q-th," meaning p parts each equal to the q-th part of a whole. (This we may meaningfully refer to as the u-property or u-aspect of a fraction, that is interpreted as the number of fractional units.) When the numeric aspect of the fraction needs to be emphasized, "p/q" is pronounced simply "p over q" or "p divided by q."
https://www.youtube.com/watch?feature=player_embedded&v=DnFrOetuUKg
