# Number Systems

## What is Number Systems:-

A number system is a system of writing for expressing numbers. It is the mathematical notation for representing numbers of a given set by using digits or other symbols in a consistent manner. It provides a unique representation to every number and represents the arithmetic and algebraic structure of the figures. It also allows us to operate arithmetic operations like addition, subtraction, and division.

The language we use to communicate with each other is comprised of words and characters. We understand numbers, characters and words. But this type of data is not suitable for computers. Computers only understand the numbers is called number system.

Ex :- The counting numbers (1, 2, 3, …) together with the operations of addition, subtraction, multiplication, and division and the properties they satisfy.

### Different number systems are mentioned below.

1. Decimal number system
2. Binary number system
3. Octal number system #### Decimal Number :-

In algebra, a decimal number can be defined as a number whose whole number  part and the fractional part is separated by a decimal point. The dot in a decimal number is called a decimal point. The digits following the decimal point show a value smaller than one.
Decimals are based on the preceding power  of 10. The number system that we follow is called as Decimal Number System where the base is 10.The base 10 indicates that there are 10 different symbols that we use it.

Ex:- (91274934)10 all base of 10 is a Decimal  number.

#### Binary Number :-

The binary number system is a numbering system that represents numeric values using two unique digits (0 and 1). Mostly computing devices use binary numbering to represent electronic circuit voltage state, (i.e., on/off switch), which considers 0 voltage input as off and 1 input as on. A binary number system is a system which has a base of two. It means that it has only 2 different symbols that make up its number system.

Ex:- (101010001)2 all base of 2 is  binary number.

#### Octal Number :-

An Octal Number System is a number system having eight digits only (0,1,2,3,4,5,6,7). This means any number can be written using the eight digits of this system.
For example, we use the decimal system where there are 10 digits (0,1,2,3,4,5,6,7,8,9) & all numbers are formed using these 10 digits. But for octal system, all numbers will be formed using only eight digits (0,1,2,3,4,5,6,7).

Ex :- (7561235)8 all base of 8  are  octal number