The children in the middle class have learned about graphics, and they like graphics very much. They have a certain understanding of triangles, parallelograms, squares and rectangles. On this basis, the understanding of trapezoid is a process for children to consolidate their previous knowledge and improve it. The following is the math teaching plan "Understanding Trapezoids" for middle school students that I brought. Welcome to reading.

Middle School Students' Mathematics Teaching Plan "Understanding Trapezoid"

First, the teaching design ideas:

Because trapezoid is a quadrilateral with only a set of parallel sides, it is the most difficult one for children to understand in plane graphics, especially the concept of trapezoid, which is abstract. Therefore, as long as the children in the middle class know its characteristics, they can understand the trapezoid and find out the corresponding figure, without the need for children to describe its characteristics in words. Because the concept of trapezoid is not easy for children to understand, I will not start with the concept of activity design, but let children operate through various activities, such as finding graphics and spelling graphics. ) feel it repeatedly and gradually understand the characteristics of trapezoid. Another difficulty for children to understand trapezoid is the diversity of trapezoid. Children's cognition is characterized by preconceptions and easy to form stereotypes. Therefore, children should be exposed to all kinds of trapezoids at the beginning of the activity, and the trapezoids that children see and make in each link are all kinds.

Second, the teaching background analysis:

This lesson is very important in this unit and plays a connecting role with the previous articles. Children's acceptance of learning knowledge is from easy to difficult, from simple to complex, from concrete to abstract, so this class is arranged after learning triangles, parallelograms, squares and rectangles, which is easier for children to understand and accept. The children in our class have strong memory, but poor hands-on ability, so I try my best to create opportunities for children to operate and cultivate their hands-on and brain skills.

Third, the analysis of teaching emphases and difficulties:

Key point: understand the characteristics of trapezoid.

Difficulties: Know different trapeziums.

Fourth, the design of teaching objectives:

1, know the basic characteristics of trapezoid; Consolidate the understanding of geometric figures.

2, learn to use a variety of methods to turn all kinds of graphics into a trapezoid.

3. Cultivate children's observation, imagination and hands-on ability.

Five, teaching blackboard design

Activity preparation of intransitive verbs:

① Environment creation: put some pictures with trapezoid in the activity room.

(2) Prepare corresponding triangular, square, rectangular, parallelogram and trapezoidal plastic templates.

③ Some colored pencils, scissors, white paper and some pictures of trapezoidal dolls (including ordinary trapezoid, right-angled trapezoid and isosceles trapezoid).

Seven, the process of teaching activities:

(A review of old knowledge, leading to new knowledge:

① Show plastic templates of triangles, squares, rectangles and parallelograms (children answer and teachers give encouragement).

Teacher: Today, I have a new friend who wants to meet you. Do you like being our friend? (like)

(3) First show a picture of an ordinary trapezoidal doll, and let everyone guess its name. What are the differences and connections between its parallelograms?

Then show the picture of the right-angled trapezoid doll, and let everyone guess its name. What is the difference and connection between it and the first trapezoid?

⑤ Finally, show the picture of the isosceles trapezoid doll, and let everyone guess its name. What is the difference and connection between it and the first trapezoidal doll?

The children discussed with each other, and the teacher asked the children to come to the stage to talk about their findings.

Teacher's summary: The first trapezoid doll picture is called trapezoid, the second trapezoid doll picture is called right trapezoid, and the third trapezoid doll picture is called isosceles trapezoid. Trapezoids, like squares, rectangles and parallelograms, all have four sides, but only one group of opposite sides of a trapezoid is parallel, and the two parallel sides are not equal in length.

(2) look for it:

Looking for trapezoidal dolls in the activity room, how many trapezoidal dolls did you find? What kind of trapezoidal doll is it? Tell your good friend about the trapezoidal doll you found and see who found more. Teachers give timely and appropriate guidance and encouragement.

(3) Fighting:

Let the children freely choose from the templates of triangle, square, rectangle and parallelogram, and then make a trapezoid with the selected graphics. Children can discuss with each other, and teachers can give timely and appropriate guidance and encouragement. Ask the children to answer their own findings on the stage. What kind of figures do they use to spell out the trapezoid? Teachers and children will evaluate children's works together and give encouragement.

(4) Draw a picture and cut it out:

Provide children with white paper, crayons, scissors and various trapezoidal templates, and let them put the trapezoid on the white paper. First, draw a trapezoid with crayon according to the trapezoid template, and then cut the trapezoid drawn on the white paper with scissors. After the child cuts off several trapezoids, try to let the child draw a trapezoid on the white paper with a colored pen, instead of a trapezoid template, and then cut it off after painting. Similarly, later, I tried to let the children cut out the shapes of various reminders directly with scissors, instead of the trapezoid of colored strokes. Teachers and children evaluate children's works together and give encouragement.

(5) Have fun:

Teacher: Do the children know? Trapezoidal babies can be naughty. It tumbled for a while, and then lay down to sleep. Do you think it's still trapezoidal? The teacher gave the kindergarten teacher one or two styles, and then let the children play with the trapezoid cut by themselves and put it in their own way.

The teacher concluded that the trapezoid can be put upside down and put in sleep. They are all trapezoidal. Today, we have a certain understanding of trapezoidal dolls through hands and brains, and you have become good friends with trapezoidal dolls. Are you happy? (Happy) There are still many trapezoidal dolls in life. Shall we go and find them together? (Good) Lead the children to find the trapezoid outside the activity room.

Eight, reflection on teaching cases:

1, the activity link is smooth and the transition is natural. I set up five links in this activity: knowing the trapezoid → finding the trapezoid → spelling → drawing, cutting → playing. In the design of links, from easy to difficult, step by step, in line with the law of children's development. Every link allows children to fully use their hands and brains, so that children's thinking has been greatly developed and their understanding level has been continuously improved.

2. Enriching the use of teaching methods The key to this activity is to let children know the characteristics of trapezium, know different trapezium, and correctly find trapezium in various graphs without interference from other graphs. Therefore, in the activity, teachers adopted rich and effective teaching methods, and carried out teaching by means of teacher's demonstration, explanation, children's observation and operation. Judging from children's reaction in activities, the application of these methods is more reasonable. Children can actively participate in activities, think positively, and respond accordingly with the deepening and development of the situation.

3. The activity was well prepared and carried out smoothly.

In this activity, teachers choose teaching content close to children's life according to the age characteristics and development requirements of middle class children, and run games through activities. In the activity, the teacher not only provides the children with rich operational materials, but also is concise and instructive in their own language organization, so that the children can clearly understand what to do. In the activity, the children played boldly and participated actively, which fully mobilized their enthusiasm and created a good activity atmosphere, so as to better acquire knowledge about trapezoid.

The atmosphere of the whole activity is relaxed, and the children are very interested in exploring in such a relaxed and comfortable environment. This activity left a deep impression on us, and it is worth learning and exploring from all aspects.