How should I walk up to a girl in the hallway without making it awkward?

Ok so there's this really cute sophmore that I see in the hallway, but I have no classes with her. What i want to know is how I can walk up to her in the hallway without being creepy or awkward and ask for her number, thank you. Im also a freshman and I'm 6ft tall average looking guy if that helps.
How should I walk up to a girl in the hallway without making it awkward?
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