1. Preparation tool: Prepare an A4 piece of paper, pencil, eraser, colored pen or colored pencil. Determine the central theme: determine the name of unit 3 and write it in the center of the paper. Add main content: add the main content of this unit around the central theme, such as concepts and formulas.

2. Add subtitle: Add subtitle under each main content to show more detailed information. Use colors and images: Use different colors and images to emphasize different themes or content. Perfect details: Add more details and notes as needed to better understand and remember the content.

3. Check and modify: check the errors or deficiencies in the mind map and make necessary modifications. When drawing the mind map of the third unit of fourth grade mathematics, we can gradually expand each theme and sub-theme according to the chapter order of the textbook.

4. At the same time, different colors and images can be used to distinguish different contents and concepts for better understanding and memory. Finally, check and modify the mind map to ensure that it is clear, accurate and organized.

Fourth, the curriculum content of the third unit of mathematics

1, Understanding of Large Numbers: This unit will introduce the concept of large numbers, including reading and writing numbers within 100 million, comparing numbers, divisors and so on. Law of multiplication: This unit will introduce the laws and properties of multiplication, including commutative law, associative law and distributive law.

2. Multiplication and division relationship: This unit will introduce the multiplication and division relationship, including the reciprocal relationship between quotient and product and the relationship between the parts of multiplication and division. Operational nature of division: This unit will introduce the nature and laws of division, including commutative law, associative law and distributive law.

3. Application of multiplication and division: This unit will introduce how to apply multiplication and division to solve practical problems, including calculating average value, calculating time and calculating distance.

4. In the study of this unit, students need to master the laws and properties of reading, writing, multiplication, multiplication and division, and can apply multiplication and division to solve practical problems. At the same time, students also need to cultivate their thinking ability and computing ability, and improve their mathematics literacy.