The second stage: 5-7 years old young convergence: provide more interesting learning methods, enrich mathematics cognition, improve and consolidate children's mathematics knowledge, and let children upgrade smoothly from the stage of image thinking to the stage of abstract thinking;
The third stage: thinking improvement at the age of 7- 10: consolidate the learned mathematical knowledge, deeply explore and build a perfect knowledge structure, develop the connection between mathematical knowledge and other disciplines, improve the application ability, and lay a solid foundation for more advanced abstract mathematics learning.