Number keys on my keyboard not working
I have a Macbook Pro thirteen inch notebook. I just tried to type numbers with my keyboard and only the zero key is working. I did a google search and came across an article on apple support forums that had me test my keyboard using the keyboard viewer and they definitely aren't working. What should I do and what could have caused it. I just got the computer via a black friday sale last november. Very concerned, any help will be greatly appreciated. Thanks in advance.
MacBook Pro (13-inch Mid 2012), OS X Yosemite (10.10.2)