5 or 10 significant figures gives wrong results in Classic 6
The following calculation ln(2)/(27*24*3600) results in calculating a half life. In GeoGebra Classic 6.0.496 (and possibly latest version) on W10, several users report this to give the wrong answer. This is easily checked by comparing to the result displayed with 13 significant figures.
My guess is that this is a bug that has not been caught yet since not many users use numbers so small as these.