How do you talk to a girl you like but they barely know you in high school?

she's in your cl...that's enough "introduction" to talk to her...ask her a question about any homework you had...but i'd definitely start talking to her and get to know her before asking her out...if you still like her after you've gotten to know her then the asking out part is all about just getting the courage to do it...but, it's really not that hard