BCD - Binary Corded Decimal

Binary Coded Decimal is a numerical code.
In this code structure, each of the decimal digits (0-9) is represented by a four-bit binary code (eg: 3 is represented by 0011)
Each digit is then represented by it's binary equivalent.
16 unique(different) numbers can be stored in the 4 bit binary code.
Thus there are 6 invalid four-bit combinations in the BCD code

The number 59 is coded in BCD as follows

5	9
0101	1001

BCD code is 01011001

The number 386 is coded in BCD as follows:

3	8	6
0011	1000	0110

BCD code is 001110000110

This makes BCD easy to read, but it is not very efficient in terms of storage space, nor is it as efficiently processed in hardware.

Converting the Decimal value 546 to BCD

5 = 0101
4 = 0100
6 = 0110

Thus 54610 = 0101010001102

Converting the binary value 011100010101 to decimal is

0111 = 7
0001 = 1
0101 = 5

Thus 0111000101012 = 71510