People's education printing plate fourth grade mathematics teaching plan
The meaning teaching plan of decimals in the first volume of fourth grade mathematics
Teaching objectives:
1, through observation, measurement, guessing and other learning activities, I feel that decimals come from life and that decimals are everywhere in life;
2. Understand the meaning of decimals, be able to name all parts of decimals, master the reading and writing methods of decimals, and read and write decimals correctly;
3, in the process of cooperation and communication, feel the fun of mathematics learning.
Teaching methods:
Teaching method is the sum of a series of activities taken by teachers and students to achieve their goals in the teaching process. According to the characteristics of teaching content and students' thinking, I chose the optimal combination of trial and error method and guided discovery method. Guide them to find problems, analyze problems, solve problems and acquire knowledge, so as to achieve the purpose of training thinking and cultivating ability. The meaning of decimals belongs to concept teaching, which is abstract and concise. According to students' cognition of concepts, they generally follow the law of perception-representation-abstract generalization-forming concepts.
1, understand decimals from life and make clear the necessity of using decimals.
2. Understand and abstract the meaning of decimals from the existing life experience.
3. Through observation and measurement, let students fully feel and experience that decimals are produced in life, and let students feel that decimals are everywhere in life.
4. Understand the ubiquity and wide application of decimals in life, experience the mathematics around you, and feel the value and fun of mathematics learning.
Teaching methods:
1. Learn to observe, measure and summarize, and decimals can be found everywhere in life.
2. Guide students to explore independently and cultivate their ability to solve new problems by using existing knowledge.
3. Cultivate students' self-study ability and good cooperative communication habits by guiding independent reading and reporting exchange activities.
Teaching process:
First, create scenarios to introduce new lessons.
Create a holiday scene of "5. 1" to make the content of this lesson consistent with the students' real life experience.
1. What did you buy during the holiday? How much did it cost?
2. The teacher bought a book. Let's guess how much it is worth.
Judging from the students' answers, this number can't be expressed by integers, but only by decimals. Introduce the topic.
This design aims to connect boring mathematics knowledge with students' real life, stimulate students' interest in learning, ignite the spark of their desire for knowledge, thus entering a new learning state and gathering motivation for actively exploring new knowledge.
Second, clear goals and explore new knowledge.
Students all know that decimals exist in our lives, so what do students want to know about decimals?
First, the default student questions (default)
1, where did the decimal come from? (How did this happen?)
2. What is a decimal? (Decimal meaning)
3. How to read and write decimals?
According to the questions raised by students, teachers and students analyze the questions.
1, teachers and students sum up the meaning of decimals
(1) Decimals such as "0. 1, 0.3, 0.9" are called 1 decimal places. (The denominator is a fraction of 10, which can be written in decimal places 1. 1 Decimal places represent tenths. )
(2) Decimals like "0.0 1, 0.04, 0. 18" are called 2-digit decimals. (The denominator is a fraction of 100, which can be written as 2 decimal places. Two decimal places represent percentages. )
(3) Decimals such as "0.001,0.0 15, 0.2 19" are called 3 decimal places. (The denominator is a fraction of 1000, which can be written as 3 decimal places. Three decimal places represent thousands. )
2. Learn how to write decimals
Third, consolidate new knowledge.
1, practice "testing you"; (Practice) Question 1
2. Measure the height of the deskmate in meters;
3, vegetable market to buy food statistics.
Combining the application of decimals in real life, let students experience teaching and feel the fun of mathematics learning.
Four. abstract
1 to understand the history of decimals. (small message)
Understand the history of decimals and inspire students' patriotic enthusiasm.
2. After taking the decimal course, can you tell me what you know?
Verb (abbreviation for verb) assignment
1, record some decimals from life and communicate with each other tomorrow;
2. Complete the "exercise book"
Arrange practical homework, let students combine the application of decimals in real life, experience teaching at hand and feel the fun of mathematics learning.
Teaching plan of "planting garlic seedlings" in the first volume of fourth grade mathematics
First, review old knowledge and introduce new knowledge.
1. Students review the bar chart.
Teacher: Students, we planted garlic seedlings a few days ago and recorded its growth data of 15 days. Yesterday, we sorted out the data of planting garlic seedlings ourselves, made a histogram and showed it in our hands.
Displays a bar chart of students.
Data in the health report chart
2. Ask questions and students explore painting.
Teacher: If we still want to know the whole growth and change from the 3rd day to the 5th day, how can we draw it? Teacher, here are some statistical charts. Please observe them carefully and see which one is more suitable. (Teacher shows bar chart, fan chart and line chart) Choose one.
Can you make some changes or supplements on your own bar chart to become this kind of chart?
Students discuss in groups first, and then try to draw.
Displays and reports the changes made after drawing. What do you mean?
3. Generate new knowledge and reveal the theme.
The teacher grasps the students to connect the points on the bar line, compares and evaluates them, selects excellent works, and demonstrates the process of changing the bar line statistical chart into a broken line statistical chart (drawing points and connecting lines) with multimedia.
Remind students that when the original bar chart becomes a real line chart, it should be erased.
Revealing theme: broken line statistical chart
Second, look at the statistical chart of broken lines and experience the characteristics.
1. Reading point
Teacher: What do the dots in the picture mean?
The significance of the main points of students' speeches, (the courseware shows the number of parallel marks)
2. reading trends,
Teacher: The students all read out the number of dots (the number of blackboard books). What about the lines connected by dots?
Health theory shows that the growth trend of garlic seedlings is from short to high.
Looking at the local trend, the growth is fast from the first few days to the first few days, and the growth is slow from the first few days to the first few days (blackboard trend)
estimate
According to this trend, please estimate how many centimeters garlic seedlings will grow on 10?
predict
Predict how many centimeters it will grow on the 20th day and tell me what you think.
Third, independent mapping.
Teacher: We can read broken-line statistics, so can you draw broken-line statistics? How to draw?
Show me the growth statistics of garlic seedlings. Can you make a broken line statistical chart?
Students independently draw a line chart of garlic seedling growth.
Report evaluation
Tell me about the information in the picture
Compare the growth trend of yourself and smiling garlic seedlings, where are the same and where are different.
Fourth, the use of expansion.
1. shows the statistics of new patients in Beijing in May 2003.
(1) Can you talk about the changing trend of new SARS patients from the above picture?
(2) Can you tell your classmates the reason for this trend?
2. Show the statistical chart of indoor temperature change in Xiaoling's house.
(1) Xiaoling measures the temperature every ().
(2) Generally speaking, how did the temperature change from 8: 00 to 16: 00?
Please ask another math question and try to answer it.
3. Show the statistics of the total number of refrigerators sold in this department store within one year.
Make decisions based on trends.
Teacher: If you are a sales manager, what are your plans for next year according to this year's sales trend? About how much? Why?
Verb (abbreviation of verb) extracurricular expansion
Collect statistical charts of broken lines in life after class and exchange them in the next class.
Teaching plan of "positive and negative numbers" in the first volume of fourth grade mathematics
Textbook content:
The position and function of teaching materials is that students have already known natural numbers, and on the basis of preliminary understanding of fractions and decimals, combined with familiar life situations, they have initially understood negative numbers. Through teaching, on the one hand, students can appropriately broaden their understanding of logarithm and stimulate their desire for further study; On the other hand, it also lays a foundation for students to further understand the meaning and operate rational numbers in the third period.
Teaching objectives:
(1) collect living materials and infiltrate the concept of negative numbers. Guide students to understand that positive numbers and negative numbers can represent two opposite quantities.
② Be able to read and write positive and negative numbers correctly, and know that 0 is neither positive nor negative.
③ Learn to express some practical problems in daily life with negative numbers. Have an intuitive understanding of the size between positive numbers, 0 and negative numbers.
④ Feel the role of mathematics in real life, and cultivate the good quality and practical application ability of exploring new knowledge independently.
Scholar analysis:
There are 62 students in this class, most of whom belong to the upper-middle level. Students have a certain level of cognition, strong curiosity and the ability to innovate and transfer knowledge.
Teaching strategies:
(1) Help students understand the meaning of negative numbers through colorful real life scenes. The generation and development of negative numbers stem from the needs of life. Therefore, teaching this lesson should pay attention to providing children with rich positive and negative phenomena in life, which can not only arouse students' interest in inquiry, but also make them feel that mathematics is in life and appreciate its infinite charm and value.
(2) Understand the relationship between the dividing point of opposites and "0" in an intuitive way. The difficulty of this lesson is that students can't easily understand the relationship between negative numbers, positive numbers and 0. How to break through the difficulties, intuitive teaching methods are the key. Among them, the observation of thermometer and the use of height map can effectively help students to gradually transition from intuitive to semi-intuitive to a more abstract understanding of their relationship.
(3) Carry out hierarchical inquiry activities to guide students to actively construct and develop their mathematical thinking ability.
Teaching process:
First, review.
1. Copy the passbook details, paste them in, observe the expenditure (-), and deposit them in (+). What do the numbers in this column mean?
"+"means ()
"_" means ()
What they mean is ()
{Fill in the same or opposite content}
2. Get today's weather forecast online and record the temperature data of Harbin and Fuzhou.
Harbin () means-.
Fuzhou () means-.
They are based on () degrees, for example:+16 degrees-.
-16 and-16 represent two quantities with the meaning of ().
Where is the temperature high and where is the temperature low?
Comparison:+16()- 16 {fill in >,< or =
The number with "+"is called-sign.
Numbers marked with "-"are called-signs.
+16 pronunciation-16 pronunciation.
4. Thinking: Is 0 a positive number or a negative number?
5. Collect negative numbers with different usages in life and tell me their meanings.
Second, teach new lessons.
1, check
(1)+500 means deposit 500, -500 means expenditure 500, which means (opposite) {fill in the same or opposite}
(2) Open the weather forecast chart.
Harbin (-9 ~ ~-19) indicates that the temperature today is between minus 9 degrees and minus19 degrees, and the climate is cold, snowy and freezing. -
Fuzhou (1 1 ~ ~ 6) means that the temperature today is between11and 6 degrees above zero, and the climate is warm, so it doesn't snow or freeze. -
They are based on (0) degrees, such as+16 degrees-above zero 16 degrees-negative 16 degrees-
+16 and-16 represent two quantities with opposite meanings.
Where is the temperature high and where is the temperature low?
Supplement: Understanding the Representation of Number Axis
— 16 0 + 16
(3) Health report
Numbers with "+"are called positive numbers. Note: You can also omit the "+"sign.
Numbers with "-"are called negative numbers. Note: The "-"sign cannot be omitted.
+16 pronunciation-plus sixteen-16 pronunciation-minus sixteen-
(4) Is 0 a positive number or a negative number? Talk to the team members and discuss your ideas. Then report to the team.
Summary: 0 is neither positive nor negative, it is the dividing point between positive and negative numbers.
(5) Give examples of positive and negative numbers in life.
For example: profit and loss, the number of people getting on and off the bus, the number of floors above and below the ground, the fluctuation of water level, the distance in the opposite direction, etc.
Do the students have any difficult questions after learning this lesson? Ask students and groups to solve problems, and finally the teacher answers them in time.
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