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 in this period, but some students have a poor grasp of related concepts, mainly because they 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 objectives:

1, further master the calculation method and estimation method of 100, and you can 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 relationship between the line segment, angle and right angle and triangle.

5. Continue to understand the shapes of simple objects observed from different positions and further understand the axisymmetric phenomenon.

6. Further understand the significance of statistics, continue to experience the process of data collection, collation, description and analysis, and collect and collate in simple terms. Know the bar chart (1 for 2 units) and statistical table, and ask questions according to the data in the statistical chart.

7. Further through observation, speculation, experiments and other activities, find out the arrangement number and combination number of the simplest things, cultivate students' observation and analysis ability, and form an orderly and comprehensive thinking consciousness.

Fourth, review the important and difficult points:

Add and subtract within 1 and 100.

2. The application of table multiplication in real life.

3. Develop students' concept of space with real life.

V. Specific measures for review:

1, first organize students to review and reflect on their learning process and gains. Ask the students to talk about what they have learned this semester, what they are most interested in, what they think is the most useful in life, what they find difficult to learn, and what problems have not been solved. It can also guide students to imagine their own review methods. In this way, students can understand their own learning situation, make clear the goal of further efforts, and teachers can also understand students' learning situation more comprehensively, thus pointing out the direction for targeted review and guidance.

2. General review is not a simple review exercise, but a knowledge arrangement and knowledge network. It is necessary to divide the old and new knowledge into several lines and connect the knowledge vertically and horizontally. The teaching content of this book can be divided into two lines: calculation and application problems. It is necessary to string together knowledge, establish the focus of review, and do a good job of review in a targeted manner.

3. Make a general review according to the game activities. Games are the favorite activities of junior children. Games allow students to review in play, play in review and develop in the combination of play and review. For example, review the multiplication in the table, let students play games such as guessing, checking passwords and solitaire, deepen their memory and skillfully use the multiplication formula to calculate. When reviewing multiplication formulas, we should pay attention to both comprehensiveness and key points. For example, the multiplication formula of 7-9 is relatively large, and students are prone to make mistakes. Students should be allowed to do more exercises. Another example is the review of addition and subtraction calculation. Without simple exercises, students will get bored. You can design various game activities and create situations. Students can skillfully calculate addition and subtraction while playing, which is the basis for students to master the calculation method on the basis of understanding.

4. Close contact with life. When reviewing, we should also closely link mathematics knowledge with daily life. You can design some pictures of life situations, so that students can observe, ask questions and solve mathematical problems from a mathematical point of view. Students can find math problems in life and then communicate in the whole class. Students not only feel that life is mathematics, and mathematics is life, but also all aspects have been developed.

5. Design special activities to infiltrate all kinds of mathematical knowledge. The design of special activities can make the content of review comprehensive and give students the opportunity to comprehensively use what they have learned. For example, students are designed to investigate their classmates' favorite seasons or favorite themes. Students experience data collection and arrangement in the investigation, draw statistical charts and tables, and ask and solve problems by themselves according to the data in the tables. In this special activity, the students reviewed statistics, the addition and subtraction of two digits, and solved some simple problems with addition and subtraction. At the same time, they cultivate students' ability of cooperation, communication and practical operation, and get a good emotional experience.

6. Make a general review according to the actual operation. Practical operation is the favorite form of mathematics learning activities for students in this class. Such as spelling, folding, painting, swinging and measuring, deepen the understanding of the angle. When reviewing length units, teachers should guide students to deepen their understanding of "meter" and "centimeter" through activities, such as guiding students to further express these lengths with other parts of the body. It can also guide students to observe things around them and form the representation of length units with the help of specific objects. This can not only improve students' interest in learning, but also link the study of mathematics knowledge with real life. At the same time, let students form the practical meaning of meters and centimeters in their minds.