Fractions are a way of representing a part of a whole or a division of a quantity. They are used to express numbers that are not typically whole numbers, but, rather, they represent a portion or a ratio of a whole. A fraction consists of two numbers separated by a slash (“/”) or a horizontal line. The number above the line is called the numerator, and it represents the part or quantity being considered. The number below the line is called the denominator, and it represents the total number of equal parts into which the whole is divided.