The content of primary school mathematics teaching mainly includes four aspects. One is number and algebra; The second is graphics and geometry; The third is statistics and probability; The fourth is synthesis and practice. The first part mainly includes the understanding, representation, size, operation and estimation of numbers. Letters represent numbers, equations, algebraic expressions and their operations; The second part mainly includes the basic graphics of space and plane, the nature and classification of graphics; Translation, rotation and axial symmetry of graphics; Use coordinates to describe the position and movement of graphics; The third part mainly includes collecting, sorting and describing data, and processing data, including calculating average, median and mode. Extract information from the data and make simple judgments, simple random events and their occurrence probability; The fourth part is a problem-based learning activity that students actively participate in, which is an important way to help students accumulate experience in mathematics activities. For example, pancake problems, collocation problems, finding defective products, making phone calls, painting walls, etc.