How can you activate number lock on a Toshiba Satellite laptop which has no numlock key?

Well first of all you can't deactivate it because it won't be on if you don't have a numlock button. Anyways, my Toshiba (might not be the same laptop, I'm not sure which one i have) but I've read if you go to the onscreen keyboard (start menu>programs>accessibility>Onscreen keyboard) it has a numlock button on it