The main objective of this book is to support undergraduate and graduate students in learning financial mathematics and in developing the skills required to use the concepts and basic tools that support the making of investment and financing decisions, including project evaluation. The emphasis of the book is on the applied presentation of the basic concepts, formulas and tools through the development of a large set of problems with their corresponding solution, explaining to the maximum the steps and strategies necessary to solve different types of problems that are present in this field. The problems that are dealt with throughout the text are similar to those that a professional will encounter when applying financial concepts both personally and in their daily work; Throughout this, the classic solution is emphasized using traditional formulas and indicators, together with a solution that uses the respective financial functions that are included in a spreadsheet, specifically in Excel.