[KDE] numpad digits not working how to fix

Find in launcher for "Keyboard" control window, in tab "advanced" in "moscellaneous compatibity options" group set ticks for "default numeric keypad keys" and "Num Lock on: digits; Shift for arrow keys. Num Lock off: arrow keys (as in Windows)".

If it doesn't work, find "Mouse" control window, in tab "keyboard navigation" remove checkbox for "move pointer with keyboard".

KDE plasma version 5.12.6, Kubuntu 18.04