Decimal point inquiry?

I have a project involving the RCM 3410. Just want to know, are there any defects in the RCM 3410. My problem involves the decimal point problem. When an arithmetic operation has been done, the integers are correct, however, there is an error in the decimal point operations. Example, 2.55+2.45 should be 5.0, however the result of the calculation is 5.26. I just want to clarify,if there are any limitations or defects in the RCM 3410. Also, are there any calculation accuracy problems in the RCM 3410. And will I face the same problems if use the RCM 4100. Sorry if the explanation is a bit vague. I am just a student, still new to this MicroP.