Because mathematics comes from life, it should be used for life. Primary school students have little knowledge. If they want to write a paper in this field, they can consider the following aspects: 1. Summarize all kinds of travel problems; 2. About the mosaic of graphics; 3. Some simple conclusions about spatial graphics (such as asking: Why do kittens huddle up when they sleep in winter? So that the surface area of the ball is the smallest in the geometry of the same volume); 4. Simple conclusions about garden architecture (for example, paving roads in a regular polygon park requires the shortest sum of the road lengths from each vertex to the pavilion, which leads to fermat point, etc. ); 5. About the design of mathematical riddles (for example, goodbye mom-the answer is the denominator; The road is not curved-the answer is diameter; Stand by and charge-the answer is equal sign). Wait a minute.