Mathematics According to the inquiry of official website of Jiyun Experimental School in Ruian City, Mr. Hu has been the head teacher and math teacher of the school since he taught, so Mr. Hu teaches mathematics in Jiyun Experimental School in Ruian City. Ruian Jiyun Experimental School aims at "taking students' lifelong development as the foundation and being responsible for the future of the nation"; Based on teachers' professional development, improve teachers' professional realm; Based on the sustainable development of the school, build a well-known brand of the school.