The manual contains general information about the features of mathematical modeling and the theoretical foundations of computational methods as its tools. Methods of data processing are considered: interpolation, approximation, solution of algebraic and differential equations and their systems, calculation of integrals, optimization methods. Shows how to implement algorithms in Visual Basic for Excel 7.0. Characteristics of the most common software tools for computational work are given. Test questions for each topic and answers to them are given. For independent work of full-time and part-time university students in economic specialties, as well as students of lyceums and gymnasiums.