1. Understand negative numbers in familiar life situations, read and write positive numbers and negative numbers correctly, and know that 0 is neither positive nor negative.

2. Learn to express some practical problems in daily life with negative numbers, and experience the close relationship between mathematics and life.

3. With the help of the number axis, I can learn to compare the size of positive number .0 and negative number.

Second, the cylinder and cone

1. Know cylinders and cones and master their basic characteristics. Know the bottom, sides and height of a cylinder. Know the bottom and height of the cone.

2. Explore and master the calculation method of lateral area surface area of cylinder and the calculation formula of cylinder and cone volume, and use the formula to calculate the volume to solve simple practical problems.

3. By observing, designing and making cylinder and cone models, we can understand the relationship between plane graphics and three-dimensional graphics and develop students' spatial concept.

Third, the proportion.

1, to understand the meaning and basic properties of proportion, will be solution ratio.

2. Understanding the meaning of positive proportion and inverse proportion can help us find examples of positive proportion and inverse proportion in our life, and we can use the knowledge of proportion to solve simple practical problems.

3. Knowing the image with positive proportional relationship, you can draw an image on grid paper with coordinate system according to the given data with positive proportional relationship, and you can calculate or estimate the value of the other quantity in the image according to one of them.

If you know the scale, you will find the scale of the plan and the distance or actual distance on the map according to the scale.

5, understand the phenomenon of zoom in and out, can use the form of grid paper to zoom in or out simple graphics according to a certain proportion, and realize the similarity of graphics.

6. Infiltrate the thought of function, and let students be inspired by dialectical materialism.

Fourth, statistics.

1, can comprehensively use the learned statistical knowledge, accurately extract statistical information from statistical charts, and correctly interpret statistical results.

2, according to the information provided by the statistical chart, make a correct judgment or simple prediction.

Fifth, mathematical wide angle.

1. After going through the inquiry process of "pigeon hole principle" and having a preliminary understanding of "pigeon hole principle", we will use "pigeon hole principle" to solve simple practical problems.

2. Feel the charm of mathematics through the flexible application of pigeon hole principle.