1, textbook content arrangement: the fourth grade of Jiangsu Education Edition is the primary stage of students' mathematics learning, and the textbook content is simple and clear, which is easy to understand and absorb. However, the content involved in the fifth grade mathematics textbook is more in-depth and complicated, which requires students' abstract thinking and logical reasoning ability, and it is difficult to teach.

2. Progressive difficulty: The fourth-grade mathematics textbook is less difficult, and students can gradually establish their understanding and application ability of basic mathematical concepts. The difficulty of the fifth grade mathematics textbook will gradually increase. In introducing more complex concepts and problems, fourth-grade mathematics textbooks are more likely to arouse students' interest and help build up their self-confidence in mathematics learning.