After you compute your answer copy and paste it into a text editor 1 + 1 = 2.000000000000000444089209850062616169453 2 + 2 = 4.000000000000000888178419700125232338905 3 + 3 = 3 KCalc on my SuSE 9.3 PIII notebook is doing the same thing (sorta): "KCalc 1.8 (Using KDE 3.4.0 Level "b" SUSE 9.3")" "build with 96-bit (long double precision)"