# MATH REFRESHER : FRACTIONS/EXPONENTIAL EXPRESSION

May 19th, 2015
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A fraction is a mathematical way of expressing a value that is less than a whole unit or one. It can also be use to express a ratio of two values. A fraction consist of two parts, a numerator and a denominator. The denominator is the number that the numerator is being divided by.

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MATH REFRESHERFractionsA fraction is a mathematical way of expressing a value that is less than a whole unit or one. It can also be use to express a ratio of two values. A fraction consist of two parts, a numerator and a denominator. The denominator is the number that the numerator is being divided by. There are three types of fractions: proper, improper and mixed fractions. A proper fraction consists of a numerator that is smaller than the denominator while an improper fraction contains a larger numerator than the denominator. Mixed fractions contain an integer and a proper fraction. Mixed fractions and improper fractions are interchangeable. Comparing In order to find out which of two fractions is larger, a technique called cross multiplying is used. The first cross product is the multiplication of the first numerator with the second denominator. The second cross product is the multiplication of the second numerator with the first denominator. If the first cross product is larger than the second, then the first fraction is larger than the second. Below, two fractions are compared using this method and it can be seen that the second fraction is larger. Adding In order to add fractions, there are several rules about what format they can be in. First off, mixed fractions must be converted to improper fractions before they can be added. Secondly, fractions can only be added if they have a common denominator. In order to add fractions with different denominators

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