First, the teaching objectives
1, knowledge target
Combined with specific examples, understand the meaning of graphic area, experience the process of comparing two graphic areas, and experience the diversity of comparison strategies to pave the way for the following area units.
2. Process objectives
Through the observation, superposition and counting of grids, the size of areas is compared, and the representation of area units is formed from real life by means of spelling, pendulum and painting.
3. Emotional goals
Learn to learn independently, learn to participate in learning, and learn to cooperate.
Second, the focus of teaching
Knowing the area, knowing the meaning of the area and establishing the concept of the area can compare the size of the graphic area.
Third, teaching difficulties
Understand the meaning of area and develop the concept of space.
Fourth, the teaching process
1, set the environment to stimulate interest and introduce new courses.
Let two students do a leaf painting competition to see who finishes painting first. Who wants to participate? Which leaf would you choose? Why?
2. Explore operations and build new knowledge.
(a) a preliminary understanding of the region.
(1) Identify the surface area of an object.
Touch the cover of the math book, and then touch the desk, which is bigger? Which is smaller?
Touch the top of the pencil case or the front of the eraser, which is bigger?
Deduction: The surface of objects is their area.
Look at the size of 1 dollar coin and 1 dime.
(2) Know the area of the closed figure
(The courseware abstracts the area.)
These figures are closed figures, that is, the size of closed figures is their area. (blackboard writing: closed graphics)
(Show Courseware: Rectangle with Missing Corner)
Teacher: What is the area of this figure? It is not a closed figure and has no area.
(B) to further understand the area (compare the size of the two graphics)
(1) secret exploration game
Here are five numbers, and the secret is in one of them. Do you want to know which number it is in? The teacher gave you some hints and ruled out some wrong answers. Please listen carefully: ① Not the largest number. Who should be removed from office? Remind the students that this is through observation. (2) Not at all. Who should be removed from office? It's not in the circle. (4) It is in the larger of the remaining two graphs. Guess where it is?
Teacher: These two pictures are already on the desktop. Think about how to compare sizes. Open the envelope and let the learning tools inside help you. Think first, then work in groups. Which group has more ideas?
(2) Group cooperation to explore and report.
Team members demonstrate their methods before the projection.
(Courseware demonstration) The secret of the game
It turned out that a wise old man brought us a treasure chest. Guess what's inside? Students guess.
Open it and see what it is.
3. Class summary, expansion and extension
(1) This lesson is coming to an end. What did you gain from this class?
(2) textbook page 50 "practice a practice" question 5 (2).
"Area" is the basis for students to learn geometric shapes, and teachers need to let students understand the concept of "area" in specific situations.
Teaching plan about primary school mathematics teacher qualification examination: what is the area? I will help you solve it here. When you write a lesson plan, you can follow the above steps. For the candidates who take part in the 2020 teacher qualification interview, you must interview the contents of the teacher qualification certificate in an all-round way and carry out targeted simulation exercises. Come on!