Number Systems Class 9 - NCERT Solutions: Detailed Class 9th Maths NCERT Solutions for chapter Number Systems.
The Natural Numbers
The natural (or counting) numbers are 1, 2, 3, 4, 5, etc. There are infinitely many natural numbers. The set of natural numbers is sometimes written N for short.
The whole numbers are the natural numbers together with 0.
The Integers
The integers are the set of real numbers consisting of the natural numbers, their additive inverses and zero. The set of integers is sometimes written J or Z for short. The sum, product, and difference of any two integers is also an integer.
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