What you demand could be done in Mathcad 15 and below but Prime is lacking this feature like so many others.
So I guess you will have to wait til (if) Prime catches up with the features and abilities of good old Mathcad.
You could use the "float, xx" keyword, but this would not only affect the display of the result but it affects the precision of the whole calculation. So its not recommended using "float" in symbolic calculations at all.
WE
