# Number Systems and Number Theory

Subject: Quantitative Aptitude    Exam: CAT

Chapter Rating: Do or Die (Most Important)

Topic Weightage: 0.12

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## Important Points

Ten is called the base of our number system
Set of Integers
Z = {......-4, -3, -2, -1, 0, 1, 2, 3, 4 .......}
Positive integers 1, 2, 3, 4, ... are called natural numbers. Smallest natural number is 1 and there is no largest natural number. The set of natural numbers N is infinite.
All natural numbers together with zero are whole numbers. 0 is the smallest whole number. The set of whole numbers W is infinite.
Set of natural numbers is a subset of set of whole numbers, 0 being the exception

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