1, understanding of logarithm: classification of numbers (natural number, zero, negative number); Representation of numbers (number, quantity, position); Comparison of numbers (size, equality).

2. Addition and subtraction: addition operation (addition symbol, addition formula); Subtraction operation (subtraction symbol, subtraction formula).

3. The commutative law and associative law of addition and subtraction: the expression and interpretation of numbers; Expressions of numbers (numbers, figures, objects).

4. The relationship between numbers and their images: the meaning and application of numbers (counting, measuring and sorting).

5. Combination and split: the concept and method of combination; The concept and method of splitting; Application of combination and splitting (addition, subtraction, distribution properties).

6. Problem solving: analysis and solution of mathematical problems; Apply what you have learned and solve practical problems; Discover the laws and relationships in the problem.

This mind map can help students to clarify the main contents and ideas of a math unit. The sub-topics under each topic can further expand the teaching content and related exercises, and help students fully understand and master the basic knowledge and skills of mathematics. Teachers can adjust and expand the content of mind map according to the teaching progress and students' understanding ability.

Extended data:

To draw a mind map, you can follow these steps:

1. Prepare tools and materials: You need a big piece of paper or drawing board, a drawing pen or marker, a pencil, a colored pen or marker. In addition, you need some notes or notes to help you conceive.

2. Determine the theme: The first step of mind mapping is to determine the theme you want to show or discuss. Write this topic in the center or top position and highlight it in large font.

3. Draw the main branch line: Draw the main branch line from the center or around the theme, representing different branches or levels under the theme. Thick lines or different colors can be used to highlight these branches.

4. Add keywords and key pictures: on each branch line, summarize the content of the branch line with concise keywords or key phrases. You can use capital letters or bold words to make them more eye-catching. In addition, you can add some images or symbols to represent key concepts.

5. Further subdivision and expansion: add more branches and sub-branches under each branch line to further refine and expand related content. You can distinguish these branches with thinner lines and smaller fonts.

6. Connect with arrows and lines: Connect different branches and branches with arrows and lines, and show their relationships and levels. Arrows can represent associations or dependencies from one concept to another.

7. Notes and comments: Add notes and comments where appropriate to help understand and explain the contents of mind maps. You can use small fonts or special symbols to mark key information and details.

8. Adjust and beautify: check the layout and content of mind map and make necessary adjustments and modifications. You can use different colors and fonts to add beauty and readability.

9. Write a title and abstract: at the top or bottom of the mind map, add a title or abstract to briefly summarize the theme and purpose of the mind map.

These are the basic steps to draw a mind map. You can adjust and change according to your own preferences and needs. Remember to be clear, concise and logical, and make mind maps easy to read and understand. I believe that with the increase of practice and experience, you will become more and more skilled and more handy in drawing excellent mind maps.