Tisch
1. In the teaching of concept course, it would be better if we could strengthen it in the following aspects.
When students can understand negative numbers and negative numbers in thermometers, they can further understand that negative numbers are artificially generated for the convenience of expression. When observing the thermometer, students can not only find the relationship between negative number, 0 and positive number, but also feel the size of negative number for students who have the spare capacity to study, and realize that as the temperature drops, the temperature is getting colder and colder, and the farther away from 0, the smaller the negative number is; Conversely, the higher the temperature, the greater the positive number, and the number axis will penetrate ahead of time.
2. You can learn more about the application of positive and negative numbers in life; For example, indicating the amount of income and expenditure, what is positive and negative on the same table, 0 is the "38th parallel"; Positive numbers and negative numbers are friends and the like, and students' imagination suddenly sublimates.
3. In addition, let students know that 0 is a special number in many places, including positive and negative numbers:
(1) "0" is not a simple number, in fact, it has extremely rich connotations. (2) "0" sometimes means "none", but sometimes it doesn't mean "none". "0" and "nothing" are not the same thing. For example, the "0" degree on the thermometer cannot be said to have no temperature, but it is a symbolic temperature, which is different from the above-zero temperature and below-zero temperature.
(3) When counting, there cannot be "0". When a number has no previous unit, it is necessary to use "0" to occupy this vacancy. For example, if the number is 2002, you need to use "0" to occupy "10" and "100".
(4) "0" is the most fair, it is not only a "watershed" between positive and negative numbers, but also a "boundary marker" between ice and water. "0" is an integer, but it is neither positive nor negative, but a neutral number. Therefore, we call it a "notary" between positive and negative numbers.
Students' understanding of positive and negative numbers and 0 has improved from perceptual to rational, and I think they will never forget it.
4. According to the reality of different regions, you can give more examples of life that are related to students' real life and often come into contact, so as to deepen your impression and let students feel the close connection between mathematics and life.
extreme
I led to a set of opposing contradictions from the beginning. What if a number can't express two opposite meanings? Students use their existing life experience to solve contradictions. Before counting, they use different symbols to represent two quantities with opposite meanings, so that contradictions can be unified under the symbol thought and students can feel the role of symbols.
Mathematics activities need students' operation experiments, thinking and discussion, cooperation and communication, etc. Appropriate forms of activities are conducive to the development of mathematical activities and students' understanding of mathematical thinking methods. However, mathematics activity is not a "fancy renovation" of teaching form, let alone a "show". Classroom allows students to speak, listen, appreciate, interact and enjoy, thus realizing the effectiveness of mathematics activities.
Mathematics teaching is the teaching of mathematics activities. Mathematics activities must pay attention to all students, fully mobilize their initiative to participate in mathematics activities, so that they can truly experience, feel and understand mathematics, trigger mathematical thinking and effectively construct mathematical knowledge. This kind of activity is the effective activity needed in mathematics classroom, and the goal of mathematics teaching can be fully realized.
Practice has made me deeply realize that the real realm of teaching should be "unpretentious, true and effective". It is a vivid process of truth, effectiveness and true wisdom, and it is an innate wisdom paradise for teachers and students!
Tisso
This lesson is to let students understand the meaning of positive and negative numbers in real situations, and will use positive and negative numbers to describe the quantities with opposite meanings in daily life.
1, exercises close to real life, to promote students' effective use of what they have learned, such as "analyzing quality problems and temperature problems." "Survey Weight" makes students realize that mathematics comes from life and is applied to life, so that students can feel the function and intimacy of mathematics.
2. This course can use information technology to create situations and stimulate students' interest in learning. String the three key words of temperature, revenue and expenditure and altitude with a relatively complete thing. In this way, students will be more interested in what they have learned.
3. This course can also use information technology to understand the relative meaning of quantity. For example, show photos of Mount Everest and Turpan Basin. Compared with the sea level, one is high and the other is low. These are relative quantities. With these images, it is more conducive to students' understanding of relative meaning.
4. Integrate various learning methods to promote effective teaching.
Guiding students to explore and learn independently, giving students enough time to try and exchange methods, and allowing students to analyze and solve problems from different angles, so as to realize the exchange of ideas among students, brainstorm, find answers and solve problems, which embodies the diversification and individualization of students' thinking in solving mathematical problems. In addition, in classroom teaching, we should strive to achieve: teacher-student interaction, student-student interaction, classroom communication, and study together.
5. In the teaching of this class, there are still many shortcomings, such as how to better arrange time and apply knowledge to practice. ""When communicating, how to choose individual communication and collective communication? How can the teacher's evaluation be more in place? "I think these are the directions of my future efforts.