I am sure there is a reason for this explained somewhere in the manual, but I am hoping that someone knows the answer off the top of their head. As an example,why is it that I get the following - equating:

'5/3' (or 3, 'SPC', 5, /) = 1.66666666667 (which gives me '5/3' if i put it back as a fraction.

But if I do '5*(1/3)' (or 5,'SPC', 3, '1/x', x) = 1.66666666666 (which gives me '62500000003/37500000002' as a fraction; which is of course the exact solution of the 1.66...6 solution).

How do I prevent getting the second answer?(other than just by entering the equation in using the first method). Reason that I ask is that during exams I don't want to have to be always worrying about what format I should be entering the problem (so as to not get a large fraction as above.) I am supposing that there is a setting that I may need to change. Can anyone point me in the right direction here? Thanks