# Decimal to Binary Conversion and vice versa

**Decimal to Binary Conversion**

**Decimal Number:**The number which are formed by the number 0,1,2,3,4,5,6,7,8,9 are called decimal number. Ex: 16, 32, 128, 1001 etc.

The base of decimal number is 10. (255)10

**Binary Number:**The number which are formed by 0 and 1 only are called Binary number. Ex: 1011, 0011, 1010 etc.

The base of binary number is 2. Ex: (1010)2

**Conversion:**

convert (255)10 into Binary number

**The binary code of the 255 is 11111111. always write your answer from bottom to top.**

**Binary to Decimal conversion**

**Take a binary number 101101**

Mark number from 0 to N

1*2^5+0*2^4+1*2^3+1*2^2+0*2^1+1*2^0

= 32+0+8+4+0+1

=45

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