Tools: pen, notebook, math textbook.

1. Determine the central theme: Write "Unit 6 of Mathematics in the first volume of Grade 5" in the center of paper or software, which is the central theme of mind map.

2. Determine the main branches: According to the main contents of Unit 6, determine several main branches.

3. Add secondary branches: for each big branch, add some secondary branches and explain them in detail.

4. Use graphics and images: In order to make mind maps more interesting and easy to understand, various graphics and images can be used to express different concepts.