This book introduces students in the Bachelor's program in Business Administration to the necessary mathematical foundations tailored to the needs of economic sciences. These selected mathematical fundamentals provide the basis for further successful studies in both Business Administration and Economics. Building on the general knowledge of school mathematics acquired during secondary education, the aim is to solidify, expand, and specifically apply this knowledge to economic questions through university education. The goal is not to conduct mathematical proofs, but to understand mathematics as a tool for economic sciences.