@ turnoi: One problem the OP might run into is the all Chinese are better at maths than laowai's or let the laowai's just teach Oral English, and we know best for the rest syndrome. I have even come across Chinese teachers who think they are better at teaching English, than fully qualified and competent native speakers...I would personally forget being able to teach maths in China, unless you are qualified at PHD level or some such, but if you are, then why bother...you could be higher paid elsewhere surely?