Mathematics is like playing games, students need to practice it regularly to become perfect. So friends today we all are going to learn one of the most important area of mathematical world named as Rational expressions. Before proceeding further, lets discuss about Rational Numbers. Rational number is basically an expression which is written in the form of fractions that is a/b. Here a is the numerator and b is the denominator. The most important thing to remember while solving rational expressions is that denominator can never be zero. For example : 5/2 is a rational expression here 5 is a numerator and 2 is a denominator. The number 7 is also a rational number as it can be written as 7/1. Decimal values are also a rational number for example 2.3 can be written as 23/10.