[header] How to do percentages on a calculator [title] Review the general meaning of fractions. [step] A fraction is a comparison between two numbers, usually representing the size of a part of something to the size of the whole thing. The classic example is a pie that is cut into eight, for example, equal portions. 
The top of the fraction, called the numerator, represents the number of pieces you select. The bottom of the fraction, called the denominator, represents the total number of pieces in the pie-in this case , 8.