This was fixed in gnome-calculator 3.18.3 which is available in Ubuntu 16.04 LTS.
I was unable to duplicate this bug in Ubuntu 14.04 LTS. ** Changed in: gnome-calculator (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-calculator in Ubuntu. https://bugs.launchpad.net/bugs/1517991 Title: Arithmetical errors Status in GNOME Calculator: Fix Released Status in gnome-calculator package in Ubuntu: Fix Released Bug description: Ubuntu release: 15.10 Package version: 1:3.16.2-1ubuntu1 Enter: 1^(−0.5) Result: 1.071508607×10³⁰¹ Expected result: 1 Upstream bug: https://bugzilla.gnome.org/show_bug.cgi?id=756960 To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-calculator/+bug/1517991/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp