How do you ask out a girl you like?
she likes you and you like her
Above all, be yourself; and treat her the way you would want to be treated.
If ur afraid to do it Face to face then write her a note or text/call her
To ask out a girl you like, the best thing to do is approach her personally in nice way and request to take her out. If you are the shy type, you can write her a note but this is not advisable.
Just be yourself! Girls like that :P