Ask once you have had a few easy conversations and can talk to her without any strain. You also want a reason to keep in touch outside class, like comparing notes, studying for the midterm, a group project or a coffee after class. Give the reason, hand her your phone and keep your tone light. A number with a purpose feels like the obvious next step. A number asked for out of nowhere, in front of the whole class, feels like a big move.

Wait for a few good conversations

On the street, a man can meet a woman and ask for her number within five minutes, because both of them know what is happening and neither expects to see the other again. A class is different. If your very first real conversation ends with a request for her number, it can feel abrupt, and she still has to sit near you every week.

Two or three friendly conversations first make a big difference. By then she knows your name, she has laughed at something you said, and she has a sense of who you are. Asking for her number becomes a normal thing between two people who get along.

Give the number a reason

Classes are full of good reasons to swap numbers:

  • Comparing notes after a lecture one of you missed.
  • Studying together before an exam.
  • Working on a group project or a lab report.
  • Sending her the article or the slides you talked about.
  • A coffee after class to carry on a conversation.

The first four are practical, which makes them easy to say yes to. The last one is clearer about your interest. Use a practical reason when you are not sure how she sees you, and coffee when she plainly enjoys talking to you.

The words, and handing her your phone

Keep it to one or two sentences and say it like it is no big deal: "We should study for the midterm together. Put your number in and I'll text you about Wednesday." Then hand her your phone with a new contact open. Typing her number is easier for her than reading it out while people walk past.

Text her soon afterwards so she has yours: "Hey, it's Alex from stats." If she would rather swap Instagram, that works just as well.

When and where to ask

The best moment is right after class, as you walk out together, or in a quiet minute before it starts. Avoid asking in the middle of a lecture, in front of a table of her friends, or while she is rushing to her next class. If she is distracted or in a hurry, wait for next time. There will be a next time, which is the great advantage of a class.

Use the number for a plan

A number only matters if it leads somewhere. Text her within a day with the plan you mentioned, and make it specific: a day, a time and a place. Do not open with a long chat about nothing, and do not text her every evening.

If the study session goes well, suggest a coffee or a drink that has nothing to do with class. That second plan is where she starts seeing you as more than a study partner.

If she would rather not

Sometimes she will hesitate, say she does not really give out her number, or offer a vague "maybe later." Take it lightly: "No problem, see you Thursday." Then keep being friendly in class, exactly as before.

How you handle a no is what other people in the room remember, and a relaxed answer protects your standing far better than an argument or a sulk. Do not ask again unless she brings it up herself.

Practicing the ask somewhere easier

Asking for a number is a skill like any other, and it gets easier with repetition. Exchanging numbers and setting up dates is one of the four parts of a Cold Approach Bootcamp. The other three are approaching and conversation, attraction, and handling an interaction that does not go your way. It runs in person in Miami and New York, with live coaching on every approach and feedback after every set. A total beginner is welcome in both Group and Private.