This textbook is a set of lectures and practical exercises in Elementary Algebra written for high school and university students. Elementary Algebra prepares students for taking College Algebra, a gateway course and a requirement for all college students. This textbook emphasizes the understanding of basic concepts. It is based on the learning principle of moving “from elementary to complex.” Each topic begins with a straight-to-the-point lecture which introduces the main definitions, then an accompanying set of carefully selected problems develops an understanding of the material and the ability to use it in the following topics. Students and instructors using the book have the option to access online resources available on the website info.mathedsci.org. The site offers 37 units: one for each lecture, including video lectures (recorded in an actual classroom setting) and tutoring sessions, and self-paced, automatically graded quizzes. This comprehensive package is an effective tool for fast mastery of elementary algebra. It can be used in a variety of class formats and is ideal for independent study by a motivated student. For access to MathEdSci, see the inside page of the textbook (an additional fee is needed).