In this lecture, we focus on the numerical solutions of equations with one variavle. We begin with the elementary numerical methods such as bisection method and secant method, and then proceed to Newtons method, one point iteration method and Mullers method. Each method is followed by numerical experiments on the computer. In addition, in order for the students to be familiarized to using Mathematica, four Mathematica Quizs will be imposed to the students.