Follow the educational thought of "education should face modernization, the world and the future", attach importance to students' life experience, closely link mathematics with reality, guide students to learn mathematics on the basis of understanding, and promote students' understanding of mathematics. Show the process of knowledge generation and application, form the basic narrative mode of "problem situation-creating mode-explaining application", and guide students to gradually form diversified, scientific and reasonable learning methods. And arrange the content of teaching materials with mathematics activities as a clue to promote students' independent participation, exploration and communication. Pay attention to students' emotional experience, create a relaxed and harmonious learning atmosphere, cultivate students' interest in learning and self-confidence, and let students realize the wide application of mathematics in social life.
Second, the teaching objectives
1, understand the meaning and nature of decimals, experience the application of decimals in daily life, further develop the sense of numbers, master the changing law of decimal size caused by decimal position movement, and master the addition and subtraction operation of decimals.
2, master the order of elementary arithmetic, and know simple integer elementary arithmetic; Explore and sort out the operation rules of addition and multiplication, and use them to carry out some simple operations to further improve the calculation ability.
3. Knowing the characteristics of triangles, triangles will be classified according to their braid and angle characteristics until the sum of any two triangles is greater than the third side, and the inner angle of the triangle is 180 degrees.
4. Initially master the method of determining the position of objects, and can determine the position of objects according to the direction and distance, and can draw a simple road map. Know the broken-line statistical chart, understand the characteristics of broken-line statistical chart, initially learn to analyze the trend of data change according to statistical chart and data, and further understand the role of statistics in real life.
Third, teaching material analysis
(A), number and algebra
1, understanding of decimals and addition and subtraction. This unit is based on the study of "Yuan, Angle, Minute and Decimal" in the second volume of Grade Three, which expands students' understanding of decimals, initially connects decimals with fractions, and further understands the meaning of decimals. Combined with the specific situation, learn the mixed operation of decimal addition and subtraction and addition and subtraction, use decimal addition and subtraction to solve some problems in daily life, and feel the close connection between decimal and real life.
2. Fractional multiplication. Combined with specific situations, let students understand the significance of decimal multiplication, experience the process of exploring the calculation method of decimal multiplication, master the calculation method of decimal multiplication, and use decimal multiplication to solve simple problems in life.
3. Fractional division. This unit includes decimal division, product quotient approximation, cyclic decimal, decimal elementary arithmetic, etc. Combined with specific situations, let students experience the process of exploring the calculation method of fractional division and preliminarily experience the mathematical thought of reduction; Understand that sometimes in life, you only need to ask for the approximate value of the product quotient, master the method of finding the approximate value, and cultivate the consciousness of estimation; Have a preliminary understanding of cyclic decimals; Can use the four decimal operations to solve simple problems in daily life. 4. Know the equation. Combined with the life situation, students initially understand that numbers can be represented by letters; Through the intuitive model, the equation is preliminarily understood; Through game activities, we can get a preliminary understanding of the properties of the equation, and we can use the properties of the equation to solve simple equations.
(b) space and graphics
1, understand the graph. Through classification activities, students can further understand the characteristics of triangles, parallelograms and trapezoid. Through the classification of triangles, we can understand the characteristics of various triangles; Through calculation, it is found that the sum of the degrees of the three angles of the triangle is equal to 180 degrees, and the sum of any two sides of the triangle is greater than the third side. Will use the learned graphics to design some simple patterns.
2. Observe objects. Through practical observation, students realize that observing the same scene in different places will produce different pictures. Be able to identify the corresponding photos taken from different positions and their sequence; Be able to identify the corresponding photos and sequences taken from the height and distance of the observation point.
(3) Statistics and probability
Fair game. Through the game, the possibility of students' initial experience and the fairness of the rules of the game; Can design fair and simple rules of the game.
Fourth, specific measures.
1, understand students' original learning situation, proceed from reality, let students correct their learning attitude, encourage students more and improve their learning. Provide learning materials that are closely related to students' real life, and let students better understand the mathematics knowledge with the help of intuitive and vivid materials.
2. Create a situation to explore the laws of mathematics, so that students can unconsciously form the consciousness of exploring the laws of mathematics. Attach importance to cultivating and developing the concept of space in various activities.
3. Make more use of spare time, check and fill gaps, solve problems, and give full play to the leading role of class cadres in poverty alleviation.
4. Students who have spare capacity for learning will further improve and expand on the basis of mastering the basic knowledge they have learned. In teaching, students are guided to start thinking, solve problems independently and master scientific and flexible methods by combining some thinking topics practiced after class.
5. In-depth study of teaching materials, careful planning of teaching plans, optimization of classroom structure, giving full play to the leading role of teachers and students' main role, mobilizing students' enthusiasm and initiative in learning, cultivating students' habit of conscious learning and stimulating students' interest in learning. Strengthen practical operation, focus on teaching, give full play to students' concept of space, strengthen practical operation and intuitive teaching, give full play to the cultivation of students' space, cultivate students' ability of abstract concept, judgment, reasoning and migration, and cultivate students' flexibility and agility in thinking. Guide students to reveal the relationship between knowledge, explore laws, sum up laws, and let students learn spontaneously and creatively.