The study of mathematics is beautiful. It has a big impact on people's life. Everybody uses mathematics in their daily lives. Math helps people develop a wide range of skills, including logic, critical thinking, problem-solving, and many more. This book is a part of the "The New Book of Mathematics" series. This series has been created in accordance with the most recent National Council for Educational Research and Training syllabus (NCERT). It complies with "National Education Policy 2020" standards. The subject matter has been explained in a simple language and includes several examples from real life situations. Emphasis has been laid on making understand the basic facts, concepts, principles, and their applications in lucid language. The age and mental level has been kept in mind while making the concepts clear to the students. Carefully selected examples consist of detailed step by step solutions so that students get prepared to tackle all the problems given in the exercise.