Num pad doesn’t work in Ubuntu

When I installed Ubuntu 9.10, my num pad stopped working as it used to – it moved the mouse instead of inputing numbers. Pressing num lock didn’t help either.

Anyway I found the solution quickly on Ubuntu forums:
http://ubuntuforums.org/showthread.php?t=514554

It appears it’s some accessibility feature. I probably pressed some key combo that turned it on.