The teaching of space and graphics knowledge is an important part of primary school mathematics teaching, which plays a special role in developing intelligence, innovating thinking and improving practical ability. The knowledge of space and graphics is flexible and changeable, which challenges students' thinking. The teaching of "cuboid and cube volume" is carried out under the network technology. Students try, operate, observe, associate, guess, question, discover, cooperate and explore independently, and experience the formation process of knowledge, so that students can learn, discover and create.
First, reflect the classroom teaching life, mathematical problems situational.
The new curriculum standard of mathematics says that "mathematics teaching activities must be based on students' cognitive development level and existing knowledge and experience, and can find and put forward mathematical problems from real life." "Therefore, in mathematics teaching, we should contact the problems in life, tap the life connotation of mathematics knowledge, and make mathematics more practical and close to life. Realize the mathematization of living materials and the life of mathematics teaching. Creating teaching situation, it is found that the effect of questioning is obvious, which improves students' interest and stimulates students' thirst for knowledge; The process is as follows:
1, video clip, students click on the network courseware "Wonderful Introduction" to listen carefully and watch the story that happened in class-one student is studying the volume of the tangential skin of a cuboid, and another student asks: Do you want to ask the volume of the TV, should you cut it?
2. Students observe carefully, extract information, ask questions and talk about their own ideas. Introduction-Today we will learn how to find the volume of cuboids and cubes.
Introduce new knowledge in connection with real life.
This design not only makes students feel cordial and natural, but also has a kind of intimacy with mathematics, and it is not mysterious to feel that mathematics lives together. At the same time, it also aroused students' interest in bold exploration.
Second, reflect the independent, cooperative and inquiry learning style, and cultivate students' personality.
Because of the generality, abstraction and complexity of knowledge itself, students can't see or touch shapes, points and spatial graphics. Using the courseware, we can turn abstraction into concrete, static into dynamic, whole into decomposition, surface into combination and so on. , in line with the cognitive characteristics of primary school students.
At the same time, the new curriculum standard puts forward that students should study individually and emphasizes the cultivation of students' innovative consciousness. The rapid development and use of modern network provides students with the largest extension space and a broader learning environment for their thinking activities, so that they can fully display their individuality. Optimize learning methods and acquire new knowledge.
The new curriculum strongly advocates independent, cooperative and inquiry learning methods. Through observation, comparison, communication and other activities, it is of great significance to promote the all-round development of students' knowledge, skills, emotions, attitudes and values for the cultivation of innovative talents in the future.
The use of modern educational media conforms to the concept of the new curriculum. Knowledge and skills; Process and method; Emotions, attitudes and values. Network technology not only enables students to master knowledge and skills, but also shows students' learning process and knowledge formation process. At the same time, students' emotions, attitudes and values can be improved, and they have multi-angle thinking methods and various problem-solving ideas. Students have the potential for innovation, but there are also uneven differences. We should pay attention to individuals and teach students in accordance with their aptitude. Through the implementation of the project, we can promote the development of students' subjectivity and independence, guide students to innovate and express their views, and cultivate their multi-directional, critical and unique ideas. The process is as follows:
1. Explore new knowledge, study the volume of cuboids and cubes, and enter the online courseware Journey of Exploration 1. Try it: students study the volume of the figure composed of 1 cubic centimeter, teachers browse the students' answers, monitor them, show them on the big screen, and students talk about their own ideas.
2. Doing: Students explore the cuboid by themselves, operate 24 cubes with the volume of 1 cubic centimeter as required to form a cuboid, fill in the form, and the teacher monitors it, and show the students different operation processes on the big screen.
number of plies
figure
roll
cubic centimeter
long
centimetre
extensive
centimetre
high
centimetre
3. Groups exchange their exploration methods and conclusions.
4, group report, each group to explore methods and conclusions, teachers show their methods to students on the big screen, the whole class exchanges.
(1) is 8 cm long, 1 cm wide and 3 cm high.
(2) 4 cm long, 2 cm wide and 3 cm high.
(3) 2 cm long, 4 cm long and 3 cm high
(4) Length 1 cm, width 8 cm and height 3 cm. ...
The conclusion of the exploration is that the volume of a cuboid = length × width × height.
V=abh
5. Find the volume of the cube; Explain the reason: Cubes are special cuboids with equal length, width and height, so
Volume of cube = side length × side length × side length
V=aaa=a
What did you say to the students in the story by studying them? To study the volume of a cuboid or cube, just measure their length, width, height or side length.
Third, it embodies the expansion of knowledge and the strengthening of ideological education.
Make full use of the relevant mathematics topics in the mathematics question bank of Kelihua Resources Primary School on the Advanced Education Information Network, and establish a website (address: http://www.192.168.10.3) to serve students. Let the students choose their own topics and practice independently. Therefore, students spread their thinking wings and fly to their hearts' content. On the basis of deepening the understanding of cuboids and cubes, we can see the flash of students' creative thinking. The process is as follows:
1, browse "Mathematics Kingdom" online.
According to the content of this lesson, the teacher prepared relevant mathematical knowledge before class, such as Nine Chapters Arithmetic, Understanding of Square, Ancient Method of Calculating Volume, Mathematician, Mathematical Ark, etc. Let students know more knowledge.
2, the whole class exchange harvest.
Fourth, reflect innovative learning.
Innovation is characterized by exploration and innovation, and practical ability is the soul of human subjectivity. Courseware teaching can not only make students master knowledge and skills, but also show their learning process. At the same time, students' emotions, attitudes and values can be improved, and they have multi-angle thinking methods and various problem-solving ideas. It improves students' hands-on operation ability and cultivates their innovative spirit. Promote the development of students' subjectivity and independence, guide students to be unconventional and speak freely, cultivate students' multi-directional, critical and unique thinking, and improve and develop their hands-on operation ability. The process is as follows:
Students click "Solve Problems" to solve problems online.
1, Small Challenge-Students click on "Small Challenge" to find out the volume of cuboids and cubes and have a game. Teachers monitor and show students' operations, conduct online remote tutoring, and students report and communicate.
2. Training ground-Students click on "Training ground" to solve three related math problems. Teachers monitor and show students' operations, conduct online remote tutoring, and students report and communicate.
3. Freeport-Students click "Freeport", choose their own cuboid or cube, carry out measurement and microcomputer operation, teachers monitor and show students' operation, conduct network remote control counseling, and students report and communicate.
4. Wisdom Spring-Students click on "Wisdom Spring", where they can choose and solve three difficult problems. Teachers can monitor and show students' operations, conduct online remote tutoring, and students can report and communicate.
Fifth, it embodies the cultivation of practical ability.
Practice is Marxism's high grasp of the spirit of the times, which highlights the characteristics of subjectivity and initiative. Under the network technology, the ability to learn to collect information and operate (here refers to all activities of students' hands, eyes, mouth and brain) has been improved and developed.
Sixth, it embodies the coherence of knowledge before and after class.
1, before class: students' interest and ability to collect information have been greatly improved; Teachers prepare lessons in advance, and the preparation before class reaches 100%.
2. Classroom: It is effective in creating teaching situations and finding questions, which improves students' interest and stimulates their thirst for knowledge; Because the network provides students with a lot of information, students gain more knowledge and provide conditions for students to explore independently, thus realizing the opportunities of student-student interaction, cooperation and exchange, and teacher-student interaction; At the same time, build a knowledge innovation platform to improve students' practical ability and cultivate their innovative spirit.
3. After class: It provides conditions for students to expand their knowledge in the network environment. Because of the connection and extensiveness of spatial and graphic knowledge, the mastery of knowledge and skills in a class is limited, and students can further understand and explore knowledge by using network technology.
Seventh, it embodies the diversified evaluation methods.
Use network teachers to monitor and show students' operations, conduct network remote guidance, give timely feedback, correct homework and encourage them in time. Students report and communicate. Promote everyone's development