"Elements of Arithmetic" by Augustus De Morgan is a comprehensive book covering the fundamentals of arithmetic. De Morgan, a distinguished mathematician, provides a detailed explanation of numeration, addition, and subtraction. The book emphasizes the importance of understanding arithmetic based on reason and demonstration. It includes practical examples and exercises to help students grasp the concepts effectively. De Morgan's approach to teaching arithmetic is rational and aims to develop a solid foundation in mathematical principles. The book is structured to guide students through various arithmetic operations, ensuring a thorough understanding of the subject. With clear explanations and practical exercises, Elements of Arithmetic serves as a valuable resource for students seeking to enhance their mathematical skills.