The primary school mathematics competition mainly examines students' basic knowledge and problem-solving ability. Here are some common knowledge points:

1. Four operations: addition, subtraction, multiplication and division are the most basic operations, and you need to master all kinds of operation rules and skills skillfully.

2. Fractions and decimals: Addition, subtraction, multiplication and division of fractions, comparison of decimal sizes and transformation are common test sites.

3. Geometric graphics: including the basic concepts of points, lines, surfaces and bodies, the nature of graphics, the transformation of graphics, etc.

4. Data processing: including data collection, arrangement and presentation (such as bar chart, line chart and pie chart, etc.). ) and data analysis.

5. Logical reasoning: including basic logical relations, such as causality, juxtaposition, conditional relations and simple logical reasoning questions.

6. Application problems: These problems usually involve real-life problems and require students to apply what they have learned to solve problems.

7. Arithmetic puzzles and puzzles: This kind of problems need students to use logical thinking and mathematical knowledge to solve.

8. Measurement: including measurement and unit conversion of length, area, volume, time and weight.

9. permutation and combination: including simple permutation and combination problems, such as how many permutations and combinations there are.

10. Probability: including basic probability calculation, such as the probability of events, conditional probability, etc.

The above are just some knowledge points, and the specific test sites will be different according to different competitions and achievements. Generally speaking, the primary school mathematics competition aims to test students' basic knowledge of mathematics and problem-solving ability, and cultivate students' logical thinking ability and innovation ability.