The series of textbooks of Primary Mathematics published by People's Education Press is one of the well-known mathematics textbooks in China, and its writing team is composed of many famous mathematics education experts. The content is close to students' life, focusing on cultivating students' mathematical thinking ability and practical application ability. At the same time, the supporting teaching materials of this series of teaching materials are also relatively perfect, including teaching materials, exercise books, teachers' books and so on. Can meet the needs of students and teachers at different levels. In addition, this series of teaching materials has also been recognized and praised by teachers and students, and it is one of the teaching AIDS worthy of recommendation.