help with 32nd rounding

You can't do it with formatting, but you can use a formula that displays a number entered in another cell in that fashion:

=INT(A1) & "'" & TEXT( ROUND( (A1 - INT(A1)) * 64, 0) / 2, "00.0")

For example,

      --A--- ---B----
  1   953.78 953'25.0
  2   651.28 651'09.0
  3   123.59 123'19.0
  4   347.24 347'07.5
  5     6.71   6'22.5