1, Determine the theme: First of all, you need to determine the theme of the mind map. Here is Unit 3 of the first volume of Grade Four Mathematics. Draw the center point: in the center of the paper, draw an image or symbol related to the theme, such as a number 4, representing the fourth grade. Then, starting from this number, draw a few lines that extend around.

2. Add main branches: write down the main knowledge points of this unit on each line from the central point, such as addition, subtraction, multiplication and division.

3. Add secondary branches: add some secondary knowledge points to each major branch. For example, under "addition", you can write "two digits plus two digits" and "three digits plus three digits". Under "subtraction", you can write "two digits minus two digits" and "three digits minus three digits".

4. Add details: under each knowledge point, you can further refine and list specific examples, formulas or methods. For example, under "two digits plus two digits", you can write concepts such as "exchange law" and "carry". Use colors and images: In order to make mind maps more vivid and interesting, different colors can be used to distinguish different knowledge points.

Drawing steps of mind map

1. Determine the theme: First, you need to determine the theme of the mind map. This topic should be the main concept or problem you want to learn or discuss. Draw a center point: draw an image or symbol related to your theme in the center of a piece of paper. This image or symbol will be the center of your mind map.

2. Add main branches: start from the center point and draw several lines extending around. Each line represents a main concept or sub-topic related to the topic. Add secondary branches: add some secondary lines on each primary branch. These lines represent more specific details or ideas related to the main concept or sub-topic.

3. Add keywords or phrases: At the end of each branch, write down a keyword or phrase to describe the concept or idea. These keywords or phrases should be concise and easy to understand. Use colors and images: To make your mind map more vivid and interesting, you can use different colors to distinguish different branches.

4. Connect related branches: If some branches are closely related, you can draw a line between them to indicate this relationship. Review and revise: Finally, you need to review your mind map to ensure that all the information is accurate and complete. If necessary, you can add, delete or modify some branches.