1. Under the classification of addition, it can include the following contents: Definition of addition: Addition is a basic mathematical operation, which means that two or more arrays are combined into a sum. Law of addition: The law of addition stipulates the rules that should be followed when adding. For example, the same digit alignment, starting from single digits, all decimal, etc. Application of addition: addition has a wide range of applications in daily life, such as calculating the sum, merging the number and so on.

2. Under the classification of subtraction, it can include the following contents: Definition of subtraction: subtraction is a basic mathematical operation, which means subtracting another number from one number. Law of subtraction: The law of subtraction stipulates the rules that should be followed when performing subtraction. For example, the same digit is aligned, the single digit is decreasing, and the ten is broken and borrowed. Application of subtraction: subtraction is also widely used in daily life, such as calculating residual quantity and separation quantity.

Matters needing attention in drawing mathematical mind map;

1. Clarify the central theme: When drawing a mathematical mind map, clarify the central theme, and expand and relate all knowledge points based on the theme.

2. Clear hierarchy: The mathematical mind map should have a clear hierarchy and be divided according to the hierarchy of disciplines, so as to make the relationship between knowledge points clearer.

3. Use concise graphics and symbols: Mathematical mind maps should use concise graphics and symbols to express mathematical concepts and formulas, making the expression more intuitive and easy to understand.

4. Highlight the key points: When drawing the mathematical mind map, we should highlight the key points and emphasize and mark the important knowledge points and formulas to make the presentation clearer and more organized.

5. Pay attention to color matching: Pay attention to color matching in mathematical mind maps, and use different colors to represent different knowledge points and formulas, so as to make the presentation more vivid and easy to remember.

6. Constantly improve and update: Mathematical mind maps are not static. With the deepening of learning and the change of understanding, it is necessary to improve and update the mind map in time to make the presentation more comprehensive and accurate.