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What knowledge must be mastered in primary school mathematics?
Primary school mathematics is the basic stage for students to learn mathematics, and mastering primary school mathematics knowledge is very important for subsequent study and development. The following is the knowledge that primary school mathematics must master:

1. Number recognition and operation: including basic operations such as number recognition from 0 to 9, number comparison, addition, subtraction, multiplication and division.

2. Carry and abdication of numbers: understand the concept of decimal system and master the methods of carry and abdication.

3. Understanding and operation of fractions: Understand the concept of fractions and master the reading, writing and basic operation of fractions.

4. Understanding and operation of decimals: Understand the concept of decimals and master the reading, writing and basic operation of decimals.

5. Understanding and properties of geometric figures: including the understanding and properties of geometric figures such as straight lines, curves, closed figures, polygons and circles.

6. Calculation of length, area and volume: Master the basic units and calculation methods of length, area and volume.

7. Data collection and arrangement: Understand the methods of data collection and arrangement, and master the skills of making tables and charts.

8. Logical thinking and problem-solving ability: cultivate students' logical thinking and problem-solving ability, and apply mathematical knowledge by solving practical problems.

9. Use of mathematical symbols and formulas: Master the use of mathematical symbols and formulas, and be able to correctly use symbols and formulas for mathematical operations and reasoning.

10. Training of mathematical thinking: Training students' mathematical thinking, including the ability of observation, analysis, reasoning, induction and deduction.

In a word, the basic knowledge of primary school mathematics is the basis of follow-up study and development. Students should master this knowledge through continuous practice and consolidation, and lay a solid foundation for further study.