If ur not interested in answering then don't I don't want ppl to be like this is so elementary... I just want some help :))))?

So I'm a freshmen in highschool and I like this guy, he is aware that I like him and theres a good chance he may be interested.
 I have only two days left now to give him my number and I don't know how.(spring break) I don't wanna look desperate or stupid or just an idiot in general. some things are saying to write a note and give it to him but I feel like that's stupid. I would find it easy to give a friend of his my number right in front of him, for homework etc. but I don't know any of his friends. I need some good ideas and quick. also I don't know him well. I can never talk to him cuz hes always with his friends and we cant really talk. so its not like I know this guy well. I really want to get to know him though and I have no way of getting to know him so I would like some ideas.... thx!!