1, the concept of a large number: We need to know what a large number is. In the mathematics course of the first volume of the fourth grade, large numbers usually refer to numbers greater than 10 thousand, such as 100 thousand, 1 million, 10 million and so on. These figures often appear in daily life, such as population, area, money and so on. So we can take the concept of large numbers as an important theme and present it in the form of mind map.

2. Reading and writing large numbers: After understanding the concept of large numbers, we need to learn how to read and write large numbers. In the mathematics course of the first volume of the fourth grade, students need to master the reading and writing methods of large numbers, such as how to write a large number into digital form and how to read a large number. Therefore, we can take the reading and writing of large numbers as an important branch and present it in the form of mind map.

3. Size comparison of large numbers: We need to learn how to compare the sizes of large numbers. In the mathematics course of the first volume of the fourth grade, students need to master the methods of comparing the sizes of large numbers, such as how to compare the sizes of two large numbers and how to compare one large number with another. Therefore, the comparison of large numbers can be regarded as an important branch and presented in the form of mind map.

Advantages of mind mapping:

1. Visualization: Mind mapping presents information in a tree structure, making complex information more intuitive and easy for people to understand and remember. Through mind mapping, people can quickly grasp the overall structure and key details of information and improve the efficiency of information processing.

2. Flexibility: Mind mapping is extremely flexible, and the structure and content can be adjusted at any time as needed. People can add, delete and modify nodes in the mind map to meet different needs. In addition, mind maps can be customized according to different themes and needs to meet people's individual needs.

3. Stimulate creativity: Mind mapping helps to generate new ideas and solutions by stimulating people's association and creativity. In the process of mind map creation, people can connect different information nodes through free association and brainstorming, thus stimulating creativity and inspiration.