1. Determine the central theme: determine the name of the fourth unit as the central theme on paper or electronic equipment. This topic can be the topic of Unit 4, such as "Numbers and Algebra".
2. List the key concepts: list the key concepts in Unit 4 around the central theme. These concepts are usually the basic knowledge involved in this unit, such as "number understanding" and "number operation"
3. Hierarchical list: For each key concept, the specific content under it can be further listed hierarchically. For example, under the understanding of numbers, we can list the understanding of integers, the understanding of decimals and the representation of numbers.
4. Add examples or questions: For each specific content, you can add some examples or questions to help you understand and remember. For example, under "understanding of integers", you can add "what is an integer?" Or "How to read and write integers?" Wait for questions.
5. Graphic display: In the process of drawing, you can use different graphics and colors to help you remember and understand. For example, key concepts can be represented by boxes, specific contents can be represented by ellipsis or small boxes, and examples or questions can be connected by arrows or lines.
6. Review and revise repeatedly: After completing the preliminary mind map, you can review and revise it repeatedly to make the mind map more in line with your own understanding and memory style.