1. Familiarize yourself with the textbook: Before you start to draw mind maps, you need to be familiar with the contents and knowledge points of the textbook, especially the contents of Unit 1 and Unit 2. Understand the theme and key points of each unit and the relationship between various knowledge points.

2. Central theme: Write the first volume of fourth grade mathematics as the central theme in the center of the mind map. You can use larger fonts and bold colors to highlight the central theme.

3. Branches and sub-branches: According to the content of the textbook and the themes of Units 1 and 2, relevant knowledge points are added to the mind map as branches. For each branch, lines with different colors and shapes can be used to express its relationship with other branches.

4. Symbols and charts: Use symbols and charts in mind maps to help understand knowledge points. For example, arrows can be used to represent the relationship between quantities, and graphics can be used to describe shapes and positions.

5. Key points and difficulties: Mark key points and difficulties in the mind map. You can use different colors or font sizes to indicate importance, and you can also use small stickers, sticky notes and other auxiliary tools to emphasize key points and difficulties.

The role of mind map in mathematics;

1, improve learning efficiency: Mind mapping can help students master knowledge points faster and improve learning efficiency. By summarizing and organizing the knowledge points, students can understand the knowledge system and key contents more quickly. At the same time, the drawing of mind map can also help students better grasp the learning progress and time management.

2. Enhance communication and expression skills: Mind mapping can help students better express their views and ideas and enhance their communication and expression skills. By presenting knowledge points intuitively, students can express their thoughts and ideas more clearly, and at the same time, they can better understand other people's views and ideas.

3. Enhance interest and confidence in mathematics: Drawing a mathematical mind map can enhance students' interest and confidence in mathematics. Through visual presentation, students can better understand and master mathematics knowledge, and at the same time gain a certain sense of accomplishment, so as to participate in mathematics learning more actively.