I guess there are a lot of ways to go about this. For example, you can say "hey, I thought you were really cute, do you want to get coffee some time?" ...or....you can just ask for a number "hey, I know this is really random, but can I have your number" and then be like "alright, I'll text you later" if she gives it to you.

I've never had a number rejected, but I've only went with the first option once....

give us your input dudes!