1. Numbers and counting: Students need to know and write numbers from 0 to 9, understand the relationship between numbers, and perform simple addition and subtraction operations.
2. Four operations: Students need to master the basic concepts and operation rules of addition, subtraction, multiplication and division, and be able to perform simple elementary arithmetic operations.
3. Fractions and decimals: Students need to understand the concepts of fractions and decimals, and be able to simply add, subtract, multiply and Divison fractions and decimals.
4. Geometric figures: Students need to know common geometric figures, such as squares, rectangles and circles, understand their characteristics and properties, and be able to classify and compare simple figures.
5. Data statistics: Students need to understand the methods of data collection and collation, and be able to perform simple data classification, collation and calculation.
6. Time and calendar: Students need to master the expressions of hours, minutes and seconds, and understand the basic composition of the calendar and the calculation method of dates.
7. Currency and unit conversion: Students need to know the basic unit and face value of currency, and be able to perform simple currency addition and subtraction operations and unit conversion.
8. Logical reasoning and problem solving: Students need to cultivate logical thinking ability and be able to solve simple mathematical problems through analysis and reasoning.
The above is the mathematics knowledge that must be mastered in primary school, which lays a solid foundation for students to further study mathematics.