The book is devoted to methods for solving computational problems using Excel. The topics of the book cover algebraic equations and systems, interpolation and approximation of functional dependencies, differentiation and integration, solution of differential and integral equations, as well as some other topics from the field of computational methods. In addition, the book describes the basic techniques for working with Excel, discusses how to organize working documents, analyzes methods for entering and editing data in working documents, studies the possibilities of using formats and styles, illustrates the principles of using built-in computing utilities, and also provides the basics of programming in VBA. The book can be used as a textbook when studying courses in computational mathematics and mathematical programming, as a self-teacher or as a reference when solving computational problems using Excel.