Should I ask this guy for his number?

Hi everyone, so there's this guy in my (college) chem class that I'm really crushing on. I think he might like me too because he always smiles at me, says hi, and he's always looking at me. I invited him to the beach with my friends and I tomorrow and he said he might not be able to go because of work. He seemed genuinely glad to be invited and told me "if not some other time." Tomorrow is the last day of class and I was wondering if/how I should try to get his number. We're already friends on Facebook but he barely uses it so its not much help. Should I try to get his number? How? I'm very shy and not too confident but I'm willing to give it a try. :)

yes, you could ask. But bear in mind that if he's too shy to ask you out, you may find yourself doing all the legwork in the relationship. Are you OK with that?

Just walk up to him and ask him for his number.

You can do it :)