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You can avoid that question by clearly stating your intentions, and by having a time constraint.
I think an effective way to do it is to pull out your phone while saying something like, "Me and my friends are leaving pretty soon, but I liked talking to you and I think we should hang out sometime. What's your number?"
Have the phone in your hand by this time with your finger on the keys ready to type the first number.
If she is interested in you at all, she'll submit and give you the number, even if there is a small shit test. If she's not, then you don't have a chance with her anyway, unless you go back and work on the fundamentals and get her attraction level up more.
One possible shit test you'll get with this is, "You should give me your number, I don't give my number out." Last time that happened my reply was (while smiling to convey that I wasn't upset), "It doesn't work that way with me. If you want to give me your number that's cool, if not it's no big deal."
SHOW A WILLINGNESS TO WALK AWAY.
If the interest level is there, she will not want to lose you, and you'll get the number.
A good tip my wing told me about is to be sure to stay and talk with her for at least a couple of minutes after getting the number, don't leave immediately after unless you absolutely have to. That way it doesn't look like you were just after one thing.
This guy basically just said verbatim what most pick-up material states. Spot on, and exactly what you should be doing.