I want to approach this girl. How do I let her know I'm interested in her, but also find out if she is likes me?

I like this girl and I want to let her know, without saying "hey I like you" what are some specific things I can do. Also how do I tell if she really enjoys talking to me and is not just being nice. Also she has come up to me before. When would be a good time to go up to her?
I want to approach this girl. How do I let her know I'm interested in her, but also find out if she is likes me?
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