I would think that your laptop has 'fn' key and little blue numbers on keys; 7,8,9,u,i,o,j,k,l and m. these are your numeric 'key pad', But if it doesn't...
In KDE > YaST2 > there are several on screen keyboards typically used for 'other' languages and Accessibility situation. Kvkbd seems to be installed on my openSuSE / KDE systems by 'default' as I did not specifically install it. On the right edge of Kvkbd, there is a << arrow looking thing that will expand it and show the numeric keypad.
screenshot: of kvkbd:
Kicker > (in search, type) keyboard and you should see a list generate of all the keyboard related apps you have installed. If not, back to above, YaST2 and install one.