I recommend Children's Intelligent Mathematics to you, which is a key project of the 11th Five-Year Plan of the Central Education Institute and a key application project of Beijing Normal University, and published by Beijing Normal University Publishing Group. The book was created by Mr. Liang, a professor at Beijing Normal University, which embodies the core teaching, scientific research and scientific and technological innovation achievements of Beijing Normal University. This set of children's books has three books for primary schools, middle schools and large classes each semester, two of which are for kindergartens and the other is for families. The activities of each semester are scientifically arranged according to the age characteristics of children, such as: operation activities, spelling and posing, comprehensive activities, observation and description, vision test, maze walking, board games, doing and playing, digital connection, etc. These activities crisscross children's books. These activities are only for teachers' reference when guiding children's activities. If it can't be done in the park, it can also be used as an extension of family activities. The difficulty is clear, the color is rich, the picture is vivid, and it is close to children's life.