Getting their number is a closer to continue the conversation or go out on a later date. Just talking to them for a minute and getting their number won't do anything without building interest and some follow through. If you're at the mall, presumably no one is in a rush and you have time to chat. If you're in high school, ask them about what school they go to, why they're at the mall or anything else that will lead to a conversation. Walk with them a bit, goof off and go into dumb shops to look at shit or go to the food court and grab a soda. Your interactions are going too quickly and probably feel unnatural. Act like she's a really cool friend who happens to be attracted to you and vice versa. Be flirty so she knows your intentions, but be natural and have a good time. Hope this helps!
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