With NumLock on, gnome-calculator still sees the arrow keys on the keypad as arrows, not numbers. The other numbers work. With NumLock off, it recognizes the arrow keys as the corresponding numbers. In a terminal with NumLock on, all the numbers work as expected.
See also http://bugzilla.gnome.org/show_bug.cgi?id=85356
*** Bug 70250 has been marked as a duplicate of this bug. ***
*** Bug 72403 has been marked as a duplicate of this bug. ***
Created attachment 73527 [details] This patch fixes it for me.
Fixed package is gnome-utils-2.0.2-4.
Fix confirmed with gnome-utils-2.0.2-4.