Can anyone tell me the name a math magician? Not one who does magic tricks but who is really good at math.?

Answer 1

The most easily accessible is Martin Gardner. You can find all of his books at the larger book chains, including the on line ones ( no advertising here) He wrote over a dozen books with math riddles, logic problems and all sorts of math fun.
My kids loved them well into their teens, and it helped them with math.