Cheng haijiao. Excellent homework 100 is one of the series of books on the road to success. By querying the catalogue of the book, it shows that the high score breaks through the excellence 100. The author of the first volume of Two Years Mathematics is Cheng Haijiao. Based on the teaching materials, the book has made some innovations in the teaching materials, making it a professional practical book integrating students' independent preview, classroom guidance and practice, after-class consolidation and knowledge efficient measurement and control, which conforms to the cognitive laws of primary school students.