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what can i do

What type of laptop is it?

Allot of the time food or drink gets under the key, other times the connection is faulty and rarely the circuits are burnt out.

If you can get the keyboard out give it a good clean, and make sure the connectors are seated correctly when you put it back. As always if you open a laptop be careful not to force anything they are very well compacted.
 
May need replacing, usually pretty cheap on eBay. In the meantime, you could always use an external keyboard until you get yours sorted
 
You accidentally turned your number lock on. To turn it off on most laptops you use the function key + numlock button (usually up around f-keys).