I teach Excel classes at a community college, and have a very good
understanding of the Round fuction, except for one statement I heard
another instructor make one time which has left me curious. I heard
him say that you should always use the Round fuction in any formula
where any multiplication or division is taking place. I think that's
quite a broad statement, and if true, the spreadsheet world would be
covered with Round functions. But it does beg the question...is there
something to what he said? Is there a broad rule about when a Round
function needs to be employed, and perhaps when it should NOT be
employed?

Curious as to what you folks have to say. Thanks for your help in
advance.