Number System Fundamentals for CAT and Aptitude Exams

Mastering the Number System is the foundation of scoring high in the Quantitative Aptitude section of competitive exams like the CAT. This text-based course guides you from basic arithmetic concepts to advanced problem-solving strategies, helping you build the mental models needed to crack complex number-theoretic questions. What you'll learn: Understand the classification of numbers, prime properties, and divisibility rules. Calculate factors, multiples, highest common factors (HCF), and least common multiples (LCM) systematically. Apply remainder theorems, including Fermat's and Euler's theorems, to solve complex modular arithmetic problems. Find unit digits, tens digits, and the number of trailing zeroes in large factorials. Master base system conversions and arithmetic operations in non-decimal bases. Practice structured algebraic approaches to solve quantitative word problems. You will start with core definitions and classifications before moving step-by-step through divisibility, remainders, and advanced properties, practicing with written explanations and detailed, step-by-step solved examples. This course is designed for beginners preparing for competitive management exams, with no advanced mathematical background required. Start reading today to build a rock-solid foundation in quantitative aptitude.