Number System | A Complete Revision
● Number: A number is a mathematical object used to count, measure and label.
● Number System: Number system or system of numeration is a writing system of numbers or
symbols in a consistent manner. In simple words we can say number system deals with
writing numbers.
● Depending on base or numbers used in the system, number system can be classified as:
o Binary Number System
o Octal Number System
o Decimal Number System
o Hexadecimal Number System
● These number systems are usually used in computer these days. But in “Mathematics” we
use Decimal Number System.
● Decimal Number System: “Deci” means 10 thus “Decimal number system” use 0 digits (0, 1,
2, 3, 4, 5, 6, 7, 8, 9). We can form any number using these digits. The base of this system is
also 10.
● Notation of a Number: Notation of a number can be done as:
231= 2×102 + 3×101 + 1×100
While doing notation of a number we take number from right to left for which we use two
system to represent in India:
o Indian System...