Number System

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About Number System

Master the fundamentals of the Number System with questions covering natural numbers, integers, prime numbers, factors, multiples, divisibility, HCF, LCM, remainders, fractions, decimals, and number properties. Build the numerical foundation needed for quantitative aptitude, mathematics, and competitive-exam problem solving.

This topic is part of Aptitude & Reasoning. Explore the guide, then practice with flashcards and quizzes to lock in what you learn.

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82

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Mixed

Category

Aptitude & Reasoning

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• Number System: Complete Study Guide 11 min · ›

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What is the greatest common divisor of 84 and 126?

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Frequently asked questions

What is the Number System?

The Number System is the classification and study of different types of numbers and their properties. It includes natural numbers, whole numbers, integers, rational numbers, irrational numbers, real numbers, prime numbers, and composite numbers.

Is 1 a prime number?

No. The number 1 is neither prime nor composite because it has exactly one positive factor. A prime number must have exactly two positive factors: 1 and itself.

What is the difference between HCF and LCM?

HCF is the greatest positive number that divides two or more numbers exactly. LCM is the smallest positive number that is a multiple of two or more numbers.

What is a remainder in division?

A remainder is the amount left after an integer division that does not divide evenly. For example, dividing 17 by 5 gives a quotient of 3 and a remainder of 2.

Why is the Number System important in aptitude tests?

Number-system concepts are used in many quantitative aptitude questions involving divisibility, factors, HCF, LCM, remainders, powers, fractions, and numerical patterns. Understanding these concepts also helps solve other mathematical topics more efficiently.