How can I talk to her?

you should call her about homework one day. but don't sound like you're interested in her. then when you see her in class say "thanks" about the homework. but don't call her so often about homework then she would think you're irresponsible. maybe just once.

slowly progress by talking to her about homework and school. then when you feel comfortable talking to her and the time is right talk to her about her major and interests.
this way you can get to know her first and see if you really want to go out with her. just take things slow because if you come up fast it might overwhelm her. Good luck!

You start by saying "Hi, I'm _______________________"

Well the hard part is over- you already have her number! I don't know anybody who would think it is weird for somebody to call them. You can start small by asking questions about homework so she gets comfortable talking to you, and then you can move on from there. It's not like if you call with a question she's going to think you want to marry her or anything, so go for it(:

call her! or ask her in class!

I don't think you should call her without her permission. Call me "old fashioned" or whatever, but I think it would be better to call ONLY if this girl had given her number to you personally. So how do you get her alone and face to face? Maybe try casually complimenting her. While leaving class try walking behind her and say something like" Wow.is that you who smells so good? What perfume do you wear?" Believe me hun.she'll be flattered by your "different "approach and will more than likely answer you. Then leave it at that. See if she reacts to you the next time. ALways make sure you say "hi" to her when you pass each other or your eyes meet. You should be able to tell if she digs you by the way she smiles a you or reacts when you are around. Then if it seems right.ask her out for some coffee or something. Hope this helped at least a little!

Okay, how well do you know her? And are you asking because you are interested in her? I am assuming so. I would just shoot her a cute little text, you can always start of with a complement or a come up with a random question about the homework, and then just see if she texts you back. I would keep this texting stuff up for a day or two (but don't text her too much, you don't want to scare the poor girl!) and then casually try and slip an offer to grab some coffee or something like that.! Good luck!

Just do it the old fashioned way call her up and ask her to meet you somewhere or just walk up to her when you see her.it really won't be that bad

try to talk to her when she's a lone , if not just try to call her .