1, define the theme: first, define the theme of unit 4, that is, operation. In the mind map, we can take operation as the central theme, and then expand the rules and practical applications of various basic operations.

2. Sort out the knowledge points: According to the content of Unit 4, the rules and practical applications of various basic operations are taken as first-level sub-topics, and then each sub-topic is elaborated in detail. For example, under the sub-theme of "addition", various rules, fast calculation methods and practical applications of addition can be listed.

3. Graphic expression: In mind mapping, various graphic symbols can be used to express different concepts and relationships. For example, a tree diagram can be used to represent the hierarchical relationship between various basic operations, and a flowchart can be used to represent the execution process of the algorithm.

4. Tagging keywords: In the mind map, keywords can be used to mark the core content of each topic and sub-topic. For example, under the sub-theme of "subtraction", keywords such as "inverse number", "borrow" and "check" can be marked for better memory and review.

5. Emphasis on practical application: Unit 4, the rules and practical application of various basic operations are the key contents. Therefore, in the mind map, we should emphasize these practical application scenarios, such as shopping, calculating time, measuring and so on.

Mind map, English is a mind map, also known as mind map, which is an effective graphic thinking tool to express divergent thinking. It is simple, effective and efficient, and it is a practical thinking tool.

Mind mapping uses the skills of paying equal attention to graphics and texts, showing the relationship between topics at all levels with hierarchical diagrams of mutual subordination and correlation, and establishing memory links between topic keywords, images and colors.

Mind mapping makes full use of the functions of the left and right brain and the laws of memory, reading and thinking to help people develop in a balanced way between science and art, logic and imagination, thus opening up the infinite potential of the human brain. Therefore, mind mapping has a powerful function of human thinking.

Mind mapping is a visual way of thinking. We know that radioactive thinking is the natural way of thinking of the human brain, and every kind of data will enter the brain.

Whether it is feeling, memory or idea-including words, numbers, symbols, aroma, food, lines, colors, images, rhythms, notes and so on. -it can be a thinking center, from which thousands of joints radiate outward.

Each joint represents a connection with the central theme, and each connection can become another central theme, and then thousands of joint points radiate outward, showing a radioactive three-dimensional structure, and these joint connections can be regarded as your memory, just like neurons in the brain, and are your personal database.

Mind map, also known as brain map, mental map, brainstorming map, inspiration trigger map, concept map, tree map, branch map or thinking map, is a tool for thinking in images and an auxiliary tool for thinking in images.

Mind mapping is the idea of causing visual structure and classification with a central keyword or idea; It uses a central keyword or idea to connect all representative words, ideas, tasks or other related projects into a radial line.