Graphing calculator use is often thought of in terms of pre-calculus or continuous topics in mathematics. This paper contains examples and activities that demonstrate useful, interesting, and easy ways to use a graphing calculator with discrete topics. Examples are given for each of the following topics: functions, mathematical induction and recursion, graph theory and matrices, and combinatorics and the Binomial Theorem. A list of discrete topics that do not require the programming of the graphing calculator includes also these topics: counting paths, equation solving, factorials, Fibonacci numbers, inequalities, iteration, sequences, and statistics. (MKR)