2. The nature and calculation of geometric figures: The nature and calculation of geometric figures such as triangles, quadrangles and circles require students to have a certain spatial imagination.
3. Algebraic equations and inequalities: Algebraic equations and inequalities in primary schools may be complicated for students, and students need to understand concepts such as variables, constants and equations.
4. Probability statistics: Probability statistics is one of the difficult knowledge points in primary school mathematics, which requires students to understand concepts such as probability, random events and statistical tables.
5. Calculation of area and volume: It may be difficult for students to calculate area and volume in primary school, so they need to master the calculation formulas of area and volume of various shapes.
6. Solve complex math problems: In some math competitions or exercises, there may be some complex math problems, which require students to have strong problem-solving ability and logical thinking ability.
7. Series and progression: Series and progression is one of the difficulties in primary school mathematics, which requires students to understand the concepts of arithmetic progression, geometric progression and summation formula.
8. The nature of coordinate system and graphics: When solving some geometric problems involving coordinate system, students may need to spend more time to understand the nature of graphics.
9. Combination and arrangement: Combination and arrangement is one of the difficulties in primary school mathematics, which requires students to understand the concept and calculation formula of combination and arrangement.
10. Function and extreme value: Function and extreme value are one of the difficulties in primary school mathematics. Students need to understand the concept, properties and methods of finding extreme value of function.