Numbers and algebra:

1, so that students can further understand the meaning of multiplication and division, and understand the internal relations of multiplication and division; I can recite multiplication formulas, calculate multiplication and division tables by mouth skillfully, and calculate multiplication and division tables vertically, which can solve some practical problems.

2. Make students further feel the duration of 1 hour, 1 minute and 1 second, have a preliminary concept of time for 1 hour, 1 minute and 1 second, and learn to read the time on the clock face.

Space and graphics:

1, by observing the process of polygons, quadrangles, pentagons and hexagons can be correctly distinguished.

2. Know the line segment in mathematical activities, know the characteristics of the line segment, and draw a line segment with a specified length. The length of a particular object can be measured in centimeters and meters.

3. I can use the words "which row is which row" to describe the position of the object, understand the east, west, north and south in connection with real life, and read the floor plan. Words such as east, south, west and north will be used to describe the corresponding positional relationship between objects.

4. In observing an object from front to back, left and right, I realized that the same object may be observed in different positions, and the shape of the object I saw may be different.

Statistics and probability:

1. In order to further experience the process of collecting, sorting, describing and analyzing data, I will use the method of "√" to record survey data, master the method of representing statistical results with block diagrams, and be able to ask and answer simple questions according to the data in statistical charts.

2. Further feel the possibility of simple events and describe the possibility of events with words such as "certain", "possible" and "impossible". At first, something will happen, something may (may not) happen, and something may (may not) happen.

Second, review the difficulties:

Review key points: Make students explore and understand the multiplication formula on the basis of understanding the meaning of multiplication and division, skillfully use tables for oral calculation of multiplication and division, and solve some practical problems.

Difficulties in review: experience the process of data collation, know simple statistical tables, pictographic statistical charts and block statistical charts, fill in the corresponding charts, and conduct simple questions and answers according to the data in the statistical charts.