let\'s translate from decimal to binary decimal (BCD) like this:
9999999910 = 9 9 9 9 9 9 9 9 = 9(=1001) 9(=1001) 9(=1001) 9(=1001) 9(=1001) 9(=1001) 9(=1001) 9(=1001) = 10011001100110011001100110011001BCD
the Final answer: 9999999910 = 10011001100110011001100110011001BCD