First class total
Teaching objectives:
1. Understand the characteristics of points, lines and surfaces of cuboids and cubes, the length, width and height of cuboids and cubes and the edges of cubes, and understand the relationship between cuboids and cubes.
2. Cultivate students' observation ability, practical ability and inductive ability.
Teaching focus:
Know the meaning of face, edge, vertex, length, width and height (side length) of cuboid and cube.
Teaching difficulties:
Characteristics of cuboids and cubes.
Preparation before class:
Teaching aids and learning tools for cuboids and cubes.
Class arrangement:
1 class hour
teaching process
First, understand the characteristics of cuboids
1. Teaching examples 1
(1) What objects in our life are cuboids?
Student exchange.
(2) Teachers show cuboid teaching AIDS.
How many faces does a cuboid have? What faces are there?
How many faces can each person see in the seat at most?
Students communicate the results they see.
The teacher pointed out: Because we can only see its three faces at most, we usually draw three faces when drawing a cuboid.
The teacher instructed the students to draw a three-dimensional picture of a cuboid and introduce its edges and vertices. Students and teachers work together.
How many edges and vertices does a cuboid have? What are the characteristics of its face and edge?
Each student gets to know each other by watching, testing and comparing, communicates in groups, and then communicates with the whole class.
Teachers write on the blackboard in time according to students' communication.
Vertex: 8
Rib: 12, divided into three groups, each group has the same length.
Face: 6, and the opposite shape is exactly the same.
Let's talk about the characteristics of points, lines and surfaces of a cuboid with reference to their teaching AIDS.
The teacher further introduced the students' understanding of length, width and height.
2. Complete the corresponding exercises.
3. Complete Exercise 3, Question 1
Students communicate directly in groups.
Second, understand the characteristics of the cube.
1. Teaching Example 2
(1) Show the cube teaching aid and ask: How many faces, sides and vertices does a cube have? What are the characteristics of their faces and corners?
Let the students imitate the learning method of example 1, look, measure and compare, and study the characteristics of cubes.
(2) exchange the results of learning, and the teacher writes them on the blackboard according to the students' reports.
(3) Similarities and differences between long cubes and cubes.
Students discuss and communicate in groups according to blackboard writing and three-dimensional graphics.
Report the results of the discussion, and the teacher shows their relationship with a set of charts.
2. Complete the corresponding exercises.
Third, consolidate the practice.
1. Finish the exercise 1, question 2.
Ask the students to answer and comment collectively.
2. Complete question 3 of exercise 1.
(1) What is the cuboid observed by the students? Which is a cube?
(2) Students answer directly.
(3) Focus on whether other surfaces are exactly the same.
3. Complete question 4 of exercise 1.
Ask the students to point out which line segment their length, width and height are, and then say.
How much did you say?
Fourth, class summary.
Verb (abbreviation for verb) assigns homework.
Complete question 4 of exercise 1.
Postscript of teaching:
In the teaching activities of cuboid features, let students operate by hands and participate in learning activities with various senses in the process of using learning tools, which can not only deepen students' understanding of knowledge, but also push students to the main position, let them actively operate, explore and think, strengthen hands-on operation in teaching, provide intuitive and attractive perceptual materials, and let students experience the perception and understanding of cuboid features through a series of practical operation activities.