1. is to ask the corresponding questions according to the teaching content, let the students think and answer, then write short sentences and form a table. You can also design a table first and fill in keywords while discussing. This kind of blackboard writing has strong contrast and is easy to compare the similarities and differences of concepts, which is convenient for students to grasp the essential attributes of concepts and deeply understand the knowledge they have learned. For example, when teaching the relationship between ratio, division and score, you can design the following blackboard writing:

2. Graphic style. It is to present the teaching content with concise graphics and outline words. It takes the internal logical relationship of knowledge as a clue, and the pictures and texts set each other off. It helps students to analyze and think through graphics, and shows the thinking process with outlined words, which can highlight the teaching focus, facilitate students to grasp the main points, understand and master the level and structure of knowledge, form a complete and clear knowledge structure, and improve the ability of analysis and generalization. For example, when teaching "area and area unit", a teacher designed the following blackboard writing:

3. Structural formula. It is a complete blackboard writing composed of words, short sentences and short connecting symbols. These words and short sentences are a concise summary of what you have learned. This kind of blackboard writing can accurately show the internal relationship between knowledge. For example, when teaching "Rewriting Names and Numbers", you can design the following blackboard writing:

4. Symmetry. It is to use simple words, lines and symbols to form a symmetrical blackboard writing. It enhances the expressive force of blackboard writing, gives students a clear, strong and complete feeling, makes students infected and edified by beauty, facilitates students to observe and deeply understand new knowledge, not only highlights key points, but also inspires students' thinking. For example, when teaching "the nature of decimals", a teacher designed the following blackboard writing:

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