Natural Binary Coded Decimal (BCD) Decimal BCD group of four binary digits represent oooo a single decimal digit 0001 0123456789 0010 0011 0100 0101 0110 0111 1000 1001group of four binary digits represent 0 a single decimal digit 1 2 3 4 5 6 7 8 9 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 Decimal BCD Natural Binary Coded Decimal (BCD)