1, so that students can contact the existing knowledge and experience and experience the process of abstracting practical problems into formulas and equations; Through the exploration and understanding of the significance, nature and calculation method of fraction addition and subtraction, the necessary calculation skills are formed. ?

2. Let students acquire relevant basic knowledge and corresponding basic skills in the process of determining the position with number pairs, understanding the characteristics of the circle, and exploring and mastering the formulas of the circumference and area of the circle.

3. Experienced the process of expressing relevant data with composite broken line statistical chart, and can conduct simple analysis and communication; Be able to complete relevant broken line statistical charts as required.

Mathematical thinking:

1, in the process of understanding equations, equations, exploration, etc. Develop abstract thinking and enhance the sense of symbol.

2, in the process of understanding common multiples and common factors, cultivate good thinking quality.

3. In the process of understanding the meaning of fractions, develop the ability of rational reasoning and preliminary deductive reasoning, and constantly enhance the sense of numbers.

4. In the process of learning to use number pairs to determine the position and know the circle, exercise thinking in images and develop the concept of space.

5. In the process of learning statistics, further strengthen the statistical concept and cultivate statistical ability.