Is this it? Lead the mathematical storm? My favorite interesting math book, Grade Three in Primary School, is written according to the new curriculum standard of full-time primary school mathematics in nine-year compulsory education. The main chapters are: number and calculation, quantity and measurement, geometry preparation knowledge, application problems, statistical preparation knowledge, ratio and proportion, algebra preparation knowledge, mathematical stories and so on. It covers arithmetic, algebra, geometry, combination, number theory, graph theory, probability, division, games, logic and other interesting mathematical fields. She showed that "Mathematics is beautiful, interesting and competitive, and she is a game played by the smartest people in the world".