APP. this is the O' levels rule, apply to phy, chem, A. math,
E.math and maybe much more. this is how it goes,
if 155/3, and is
51.6666666666666666666666666666666666666666666666
you round off to 3 s.f., that is 51.7
but if it is 2425008/3 =808336, leave it as it is, unless
otherwise state.
and if 113/ 4 = 28.25 , a perfect nos., UNLESS it's
SPA, pr ptherwise stated, it should be left the way ot is.
but if u are taking e. maths, if i am not mistaken, leave it is
fraction, improper of mixed number is a better choice... as far as
possible
also. note that an angle, if it's in a lot of dec. best is put
in one D.P.