Problems in Calculus of One Variable by I.A. Maron is a comprehensive problem book designed to strengthen students’ understanding of single-variable calculus through rigorous practice. Covering topics from limits and continuity to differentiation, integration, and applications of calculus, the book offers a wide range of problems with detailed solutions that build both conceptual insight and computational skills. Widely used by students preparing for university exams and mathematical competitions, it serves as an essential companion for mastering the fundamentals of calculus through active problem-solving.