Start a casual conversation first. Bring up something they did or are interested in to keep the focus on them. “Hey, Christine, what’s up? How was your weekend?” “Hey, David! How’d the game go?” Say you have to leave, then ask for their number to continue the conversation later. “I actually have to run to class, but can I get your number? We’re leaving this on such a cliffhanger, I need to hear more later haha.” “Ugh, I gotta go… but here, wanna give me your number? You can tell me the rest of the story later, I’m dying to know what happens haha.” “I have to head out, but it was cool talking to you. Could I get your number? I wanna talk more another time!” Offer to give them your number if it feels awkward to ask for theirs. “Here, let me give you my number and you can text me the details about the game.” “Could I give you my number? You have to tell me more about that party, it sounds so crazy haha.”