"Z2528- Jelly Theory Mathematics-Primary Mathematics 1 Grade-Grade 6" and so on. According to Dangdang.com's data, teacher Jelly's textbooks on mathematics include Z2528- Jelly Telling Mathematics-Primary Mathematics 1 Grade -6 Volume I, Z2528- Jelly Telling Mathematics-Primary Mathematics 1 Grade -6 Volume I and Jelly Telling Mathematics-Primary Thinking Mathematics. The jelly teacher's name is Chen, who was born in Shijiazhuang, Hebei Province, 1982. Senior lecturer and meritorious teacher of high school mathematics in Gaotu classroom. He used to be a math teacher in key high schools in Hebei Province.