First, review content: length unit, addition and subtraction within 100, preliminary understanding of angle, multiplication in table, observation of objects, wide angle of statistics and mathematics.

Second, the analysis of learning situation: students have a general grasp of the basic knowledge learned during this period, but some students have a poor grasp of related concepts, mainly because students are vague about the connotation and extension of concepts in their usual training. 80% of the students have passed the exam in calculation, and some students often make calculation mistakes because of their poor study habits. In terms of ability, at present, middle school students can basically calculate correctly in addition and subtraction of two digits, but there are some problems in multiplication, especially the problem-solving and self-questioning are not complete enough. Through the final review, students' knowledge, skills and logical thinking ability should be improved to some extent.

Third, review the goal: 1, further master the calculation method and estimation method of 100, and be able to calculate correctly and quickly and further understand the diversity of estimation methods. 2, further understand the meaning of multiplication, can skillfully use the multiplication operation of two-digit multiplication. Through review, we can further understand the concepts of the length of meters and centimeters. By remembering 1 m = 100 cm, we can measure the length of an object (only the whole cm) with a scale and form the consciousness of estimating the length. 4, further understanding of the line segment, will measure the length of the whole centimeter line segment, familiar with the names of various parts of the angle, and can quickly judge whether an angle is a right angle and draw the line segment, angle and right angle with a triangle. 5. Continue to understand the shapes of simple objects observed from different positions, and further understand the axisymmetric phenomenon.