Mathematics is a beautiful and interesting branch of study. However, many students unnecessarily have a phobia about it. My effort in this book has been to present the theory, examples and questions in a coherent and well-knit manner, not only encourage the students to learn and understand the subject but also provide an insight into its beauty. The book entitled Understanding ISC Applied Mathematics is a textbook prepared for the students of class XI. This book covers the complete contents of the latest syllabus prepared and prescribed by the ISC Board to be implemented from the current academic session. The book has been prepared as per the New Education Policy (NEP). The book adheres to the latest curriculum and syllabus prescribed by the Council for the Indian School Certificate Examination, New Delhi (CISCE). Also NCERT book and Exemplar problems have been consulted. A new feature, ‘Illustrative Examples for Multiple Choice Questions’ followed by ‘Multiple Choice Questions’, Statement I/II Type Questions, Assertion-Reason and Competency Focused Questions have been added. These MCQ’s will help the students in competitive exams. For the convenience of students, the answers of the problems have been given at the end of each exercise.