NUMBER SYSTEM

A number system is the set of symbols used to express quantities as the basis for counting, determining order, comparing amounts, performing calculations, and representing value. It is the set of characters and mathematical rules that are used to represent a number.
 A number system is a way of counting things. It's a way of identifying the quantity of something.

1. Decimal has a base of 10 and its symbol is 0,1....9 and it use by humans.
2. Binary has a base of 2 and its symbol is 0,1 and it use by computer.
3. Octal has a base of  8 and it symbol is 0,1...7.
4. Hexadecimal has a base of 16 and its symbol is 0,1...9 and A,B...F.

Decimal,Binary,Octal,Hexadecimal can be converted with each other.

• To convert binary to octal the rule is just group the binary into 3.
• To convert binary to hexa the rule is just group the binary into 4.