**Binary number system**: This number system have two possibility (0,1)

**Octal number system**: This number system have 8 possibility (0,1,2,3,4,5,6,7) [3 bits can represent 8 possibility 2^3=8]

**Decimal number system**: This number system have 10 possibility (0,1,2,3,4,5,6,7,8,9)

**Hexa decimal number system**: This number system have 16 possibility (0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F) [4 bits can represent 16 possibility 2^4=16]

To convert from a number system to another number system the easy way is to convert the number to binary number system and then convert it to required number system from binary number system.

**Decimal to Binary**:

Let’s take a decimal number 1610 we will convert it to binary.

First of all right down the following. Following series start from left 2^0, 2^1, 2^2, 2^3…. and can go till 2^n

**Binary to Decimal**:

**Hexadecimal table**:

**Octal table:**

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**Binary to Hex**:

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**Hex to binary**:

**Octal to binary**:

**Binary to octal**: