The four fields of mathematics are: 1, number and algebra: understanding, representation, size, operation and estimation of numbers.

2. Graphics and geometry: the basic graphics of space and plane, the nature and classification of graphics, the translation, rotation and axial symmetry of graphics.

3. Statistics and probability: collect, sort out and describe data, and process data.

4. Practice and comprehensive application: Learning activities with a class of problems as the carrier and students' active participation are important ways to help students accumulate experience in mathematics activities. Mathematics is a subject that studies concepts such as quantity, structure, change, space and information.