Use of mathematical tools in economics helps in systematic understanding of relationships and derivation of certain results which would be more complex through verbal logic. The mathematical approach can be considered as a quick mode of transportation from a set of postulates to a set of conclusion. The purpose of this book is to give an introduction to basic tools of mathematics for use in economic theory and econometrics. The author believes that this book serves as elementary study materials for the students of economics as it is presumed that the readers are acquainted with basic calculus, matrix algebra and economic theory.This book can be used as reference material for the student of M.S. Agricultural Economics.