This lesson is selected from the standard experimental textbook of compulsory education curriculum published by People's Education Press. The main contents are: understanding of millimeter, unit conversion between millimeter and centimeter, estimation and measurement of millimeter.
The textbook of primary school mathematics published by People's Education Press is written according to spiral curriculum. This unit of measurement belongs to the measurement part in the field of space and graphics, and the first unit in the first volume of the second grade textbook: the length unit also belongs to this part of measurement.
Therefore, this lesson, as the first lesson of this unit of measurement, is an important connection point between the long unit learning of senior two and the whole unit learning of senior three. Based on this, in the teaching of this class, in addition to imparting new knowledge, we should pay more attention to let students recall and deepen the learning content of senior two, so as to lay a solid foundation for studying this unit in the future. How to get students into the study of space and graphics as soon as possible, how to construct new knowledge into the original schema and ensure the enthusiasm of learning will become the focus of this teaching.
The content of measurement is practical, which requires students to fully perceive and learn in operation. Therefore, in the compilation of teaching materials, we should pay attention to using measuring mathematics teaching materials and gestures 1mm to present scenes, ask questions and highlight teaching priorities. In teaching, I will make full use of these characteristics in the textbook to guide students to learn actively.
Second, talk about learning.
Through the study of length units in Senior Two, students have learned the importance of length units, know centimeters and meters, initially established the concept of length and estimation consciousness, know line segments, and draw and measure the length of line segments with a scale, but these are limited to whole centimeters or meters.
Students in Grade Three are usually 8 to 9 years old. According to psychology, students of this age can maintain their attention for about 20 minutes, and their self-control and persistence are not strong. Their way of thinking is mainly concrete thinking in images, and gradually transits to abstract thinking. Therefore, in the teaching process, I will pay attention to the combination of intuitive description and students' operational perception to ensure the smooth and effective teaching. The imagination of primary school students is mainly based on recreating imagination, which has a strong purpose. Under the guidance and inspiration of teachers, students associate, recall and process what they have learned before, which is helpful to understand the original knowledge and learn new knowledge.
Third, talk about teaching objectives.
Referring to the "Primary School Mathematics Curriculum Standard", according to the analysis of teaching materials and learning situation, the following teaching objectives are formulated.
Teaching objectives
1. Understand the millimeter in operation activities, initially establish the concept of length of 1 mm, understand the advance rate between common length units, and choose the appropriate length unit to measure or estimate the length of some objects.
2. Through observation, estimation, measurement, communication and other activities, cultivate preliminary practical ability and spatial concept, and enhance the awareness and ability to solve practical problems.
3. Stimulate the interest in learning mathematics in mathematics learning activities and experience the close relationship between mathematics and life.
Teaching focus
Understand the millimeter, and initially establish the concept of the length of1mm.
Teaching difficulties
The concept of the length of 1mm is preliminarily established.
Fourth, the teaching method of speaking.
This textbook adheres to the principle of "students as the main body and teachers as the leading factor" and follows the cognitive laws of primary school students. The teaching methods adopted are as follows:
1. Review the import method
2. Dialogue sharing method
3. Cognitive conflict method between existing knowledge and actual needs
4. The combination of intuitive teaching ruler and multimedia-assisted teaching.
Verb (abbreviation of verb) and learning methods
The new curriculum standard clearly points out that hands-on practice, independent exploration and cooperative communication are important ways for primary school students to learn mathematics. Therefore, determine the teaching method of this class:
1. Operation practice method
2. Association analogy method
Sixth, teaching preparation.
1, multimedia courseware ppt, a ruler made of cardboard without millimeter scale.
2. Students should prepare common rulers, math textbooks and exercise books.
Seven, talk about the teaching process.
According to the analysis of teaching, teaching objectives, learning situation and teaching method selection, the teaching process of this course can be divided into four stages.
The first stage: review old knowledge and stimulate the desire to explore.
1. The teacher found that all the students had brought rulers. Ruler, we learned how to use it in Book One of Grade Two. Now, please read aloud how to use the ruler:
When measuring the length of an object, align the starting end of the object with the 0 scale of the ruler to see the number of scales relative to the other end of the object. If the start scale is not 0, the measurement result should be subtracted from the end scale.
Once we learn this method, we must practice and use it. Please measure the length of this math textbook. (26 cm)
Can you estimate the width of this math textbook?
Is our estimate accurate or not? How to verify your estimate?
The default value is1:18cm.
The default is 2:18cm 4mm.
4. Let's estimate the thickness of the math textbook again. ? And verify.
Default 1: the thickness of the math book is less than 1 cm.
Preset 2: The thickness of the math book is 5mm.
Design Intention: Starting from measuring the familiar problem situations of students in mathematics textbooks, this link strengthens the connection between old and new knowledge while reviewing old knowledge, guides students to think and stimulates students' interest in learning.
Review the introduction of the ruler directly and tell how to use it-quickly and efficiently, laying the foundation for using the ruler in this class.
Methods This method was applied to practice, and the use of detection methods was reviewed. (Deliberately omitting the estimation of the length of math textbooks)
First, estimate and measure to test your own estimate and produce "more" values you want to be accurate. You need to study in smaller units.
It is estimated that the thickness of the math book is less than 1 cm. What should I do? -Measuring the length of shorter objects requires a smaller unit of length-millimeters.
The second stage: clear the target and focus on millimeters.
If you want to measure the length of a shorter object, or you want to measure it more accurately, you can use a smaller unit millimeter (mm) as the unit.
What do you think we will learn from millimeters?
What is millimeter? -Concept; Why do you want to learn millimeters-two reasons (try to let students find the answers themselves); How to learn millimeter-the teacher tells the students, the students learn by themselves, and the students learn from the teacher to help guide them ...)
Stage III: Construction of 1 mm length unit.
How much smaller is 1. 1mm than 1cm? (generative)
Why do you want to divide 1 cm into 10? (1 cm = 10/0mm)
Why do you want an average score?
Summary: Congratulations to the students again, you are all little mathematicians! How many cells are there in 1 cm? Are mathematicians thinking the same thing-divide 1 cm into 10 parts, and the length of each part is1mm.
2. Gesture length1mm.
The value is 3. 1 mm.
The end-to-end splicing of 1mm 1mm produces a longer line segment, that is, several 1mm is several millimeters.
Finish exercise 5, question 2 or draw a line 3 mm long.
4. Tell me what things in life are often measured in millimeters?
The fourth stage: comprehensive application and deepening consolidation. There are three comprehensive exercises arranged here.
1. Finger game: The teacher says the length, and the students gesticulate with their hands.
2. Fill in the correct unit for Xiaohong.
3.xiaoming's diary. (Correct the wrong questions) Especially in the last two exercises, I changed the boring style in the past and put the filling units and correcting the wrong questions in the specific story situation, that is, in life. Because there are many math problems in life, I will immediately test what I have learned and use it to solve problems. This is also the most fundamental intention of our learning knowledge, which makes students feel that learning is useful. Finally, I arranged an extracurricular exercise and cooperated with my parents to make a questionnaire: measure the common sense around me, extend the knowledge in class and enhance the feelings of my family.
Eight, blackboard design
Writing on the blackboard is an important means of classroom teaching, which highlights the difficulties and key points of teaching and lays a solid foundation for students to master knowledge and memory. At the same time, highlight the key points in blackboard writing design, and echo the summary of classroom teaching.
Motherboard books:
Understanding of millimeter
When the length of the object is shorter than the length of the object, or more accurate quantity is required, the unit can be millimeter.
1 cm = 10/0mm
Deputy blackboard writing:
unit of length
millimetre
What is millimeter? Why learn millimeters?
In short, the whole class pays special attention to the process and method of how students master and acquire knowledge and the development of problem-solving ability, cultivates students' enthusiasm for loving and using mathematics, pays attention to the growth of students' emotional attitudes and values while imparting knowledge, and strives to make students the real masters of learning.