Adding/Subtracting in binary and hexadecimal number systems?

Question

I have two numbers(in decimal):

M = 3892.74
N = 9341.65

I am trying to add and subtract them in binary numbers and then in hexadecimal numbers. I manage to convert the numbers into binary/ hexadecimal with 4 fraction digits.

M = 111100110100.1011   and M = f34.bd70
N = 10010001111101.1010 and N = 247d.a666

and I have found M + N = 13234.51 = 11001110110010.0101 = 33b2.83d6 I am having trouble doing the M - N ? Is there negative numbers in alternate number systems and how would I carry out this subtraction ? If my earlier work can be verified, I would also appreciate it. Thanks

Answer 1

Yes there are negative numbers. Have a look at the wiki article and the example therein.