Explain the uses of arithmetic processor

A processor has arithmetic processor (as a sub part of it) which executes arithmetic operations.  The data  type,  assumed  to  reside  in the processor,  registers  during  execution of an arithmetic instruction. Negative numbers can be in a signed magnitude or signed complement representation. There are three ways of demonstrating negative fixed point these are- binary numbers signed magnitude, signed 1's complement or signed 2's complement.  Most computers use signed  magnitude  representation  for  mantissa.