Thanks for repsonding. I pulled all the keys off the number pad and cleaned under and around them and then I played with the number 5 one specifically and took the mechanical part apart. I found that when I pressed the metal part with my finger, it works fine, but when I put the plastic part back, it doesn't work. What could be causing that?
I found out why they call the keys complicated alps switches... I had y forks, metal plates, springs, and brackets flying everywhere. I lost the spring for the 5 key (I'm convinced it disappeared into thin air, because I can't find it anywhere).... I was putting it in and it shot somewhere and now I'll likely vacuum it up. I robbed the spring from the scroll lock key since I've never used scroll lock in my life, and it's all back together, but it still won't work with plastic part on top of the metal parts.
Perhaps I should just through this thing away and buy a model M!
