BCD (Binary Coded Decimal) System

There are different BCD codes available, out of which BCD₈₄₂₁ code is more commonly used. In this system, the numbers 0 to 9 are represented by their pure binary equivalents, 4 bits per decimal number consecutively. The LSB (Least Significant Bit) has the weight of value 1, the next bit on the left has the value 2, and the next with value 4 and the MSB (Least Significant Bit) has the value 8.