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One of the differences betwixt the 32S and the 32SII is the latter's fraction entry/conversion function. I don't use it much, but it seemed to work. You might want to take a look. (In fact, I've got a 32SII on my workbench for precisely that reason, but I think I may have used the feature once, if ever . . . )
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You have a 48GX. It will convert any decimal value into a fraction (has forced accuaracy, I believe also).
To get to menu for fraction conversion use purple shift left key, then symbolic (no purple color to indicate this)#9 key, A menu appears at top, hit next key for second set of menu's. There is a Q< key to convert any decimal into a fraction. I believe this will work for you.
There are also some programs on a link website that may have more elaborate fraction routines.
Regards,
Ron Ross