Teaching topic: understanding parallelogram
Teaching content:
The content of the second volume of the fourth grade of Jiangsu Education Edition is 43 ~ 45 pages.
Teaching objectives:
Knowledge and skills:
Let the students know the parallelogram in the process of connecting with real life and hands-on operation, find its basic characteristics and judge it correctly.
Process and method:
Make students experience the process of exploring the basic characteristics of parallelogram in activities such as observation, operation, analysis, generalization and judgment, further accumulate the experience of understanding graphics and develop the concept of space.
Emotional attitudes and values:
Make students realize the wide application of parallelogram in life, cultivate the consciousness of mathematics application and enhance their interest in understanding plane graphics.
Teaching focus:
Discover the basic characteristics of parallelogram
Teaching difficulties:
Guide students to discover the characteristics of parallelogram.
Preparation of teaching AIDS: slides, onion micro-lessons, sticks, square paper, rulers, triangular rulers, parallelograms.
Teaching process:
First, introduce the story and reveal the theme.
1, story
Brief introduction to the story of "understanding parallelogram" in playing onion micro-lesson
On the plains and grasslands of the country, graphic people have been living a peaceful life for thousands of years, but today, disaster has come and a group of terrible human beings have come here. Their goal is to capture the parallelogram and bring it back for indescribable research. The parallelogram should run away quickly and not be caught by humans.
2. Introduction: Class Two of Young Onion Miao came to the grassland to capture the parallelogram. Are you willing to help him?
(Yes) But do you know anything about parallelogram? So let's further "know parallelogram" together today! (Write on the blackboard and map).
Second, explore new knowledge.
1, find the parallelogram in life, and initially perceive the characteristics of the parallelogram.
(1) Think back, where have you seen parallelogram in our life?
(2) Look at the situation map. (Show slides. The teacher also collected some parallelograms in life. Let's have a look. )
2. Do it and explore the characteristics.
(1) Instruct students to find ways to make parallelograms with materials in their hands.
(2) Teachers patrol and give some guidance.
(3) Students show their works and talk about how to do it.
3. Generate the features of parallelogram.
(1) Guess the characteristics of parallelogram.
Guide the students to observe the parallelogram made by the group. According to the experience of making parallelogram, guess: What are the characteristics of parallelogram? (Teacher writes on the blackboard)
(2) Guide students to verify the characteristics of parallelogram in groups.
(3) Guide students to report the verification results.
Play onion micro-class
Summary: The two groups of parallelograms are parallel and equal.
4. Strengthen the characteristics of parallelogram.
Complete the question 1 of "Think and do" (slide), and let the students judge which figures are parallelograms and which are not. And explain why.
6. Explore the characteristics of parallelogram.
The teacher pulls the parallelogram by magic, so that students can find its instability. Where is this characteristic of parallelogram used in life?
Step 3 consolidate the exercise
1, the deskmate finished the second question of "think about it and do it".
(1) Let the students make a parallelogram with two identical triangular rulers. Students show different spellings after the operation.
(2) Ask the students to put four identical trigonometric rulers together into a parallelogram. Show different spellings after the students operate.
2. Do the third question after thinking. If there are no jigsaw puzzles, the teacher will show slides and the students will talk about how to move them. )
4, homework layout
Finish thinking and do questions 4 and 6.
Fifth, talk about the harvest.
What did you get from this lesson?