The Teaching Plan of "Preliminary Understanding of Decimals" in the Third Grade Mathematics of the First Primary School
Teaching content: PP 88-89 of the third grade of primary school mathematics (Volume II) published by People's Education Press. Teaching objectives:
1, combined with the actual life, through measuring, measuring and finding to know decimals, reading and writing decimals, and knowing the names of various parts of decimals.
2. Experience the process of decimal system, deepen the understanding of the meaning of decimal system, and develop students' mathematical thinking ability and the ability to express and exchange information in decimal system.
3, can correctly distinguish between integers and decimals, penetrate the connection between knowledge, and stimulate students' interest in learning mathematics.
Teaching emphasis: have a preliminary understanding of the meaning of decimals, be able to know and read decimals, and know the names of decimal parts.
Difficulties in teaching: Understand the meaning of decimals initially and feel the close connection between decimals and real life.
Teaching preparation: meter ruler, prepare some pictures with unit price.
Teaching process:
First, the perception of life leads to decimals
Teacher: Students, have you all been to the supermarket? Teacher Zhang also went to the supermarket on Sunday and brought these goods. Please have a look. Students observe carefully.
Show the prices of various commodities. Students try to read.
Teacher: Have you seen these figures? What is the number? This is the new friend we are going to meet today-decimal.
Design intention: create a situation suitable for students' life and learning content, lead students to walk into life easily, approach decimals, initially feel the application of decimals in real life, and awaken students' experience.
Second, actively explore and understand decimals
(a) hands-on practice, with the help of length units to understand the decimal.
1, Teacher: Now let's look for the decimals around us, shall we? Which length unit do you think is suitable for measuring the length and width of a desktop? Please work in pairs and take out the meter ruler to measure.
Students first measure and record data in groups.
2. Teacher: How to express decimeter and decimeter in meters? (Instruct students to express 5/10m and 4/10m with fractions)
3. The teacher explained that 5/ 10 meter can also be written as 0.5 meter and read as 0.5 meter. 0.5 is pronounced 0.5. Let the students read and write. Instruct the writing of decimal points.
Teacher: How to write 4/ 10 meter? Let the students read and write.
4. Practice
(1) Question 1 "Think about it and do it".
First, observe the meaning of the picture. Students think and fill in independently, and then proofread collectively.
Question: Look at the first set of numbers. What are the connections and differences between these three numbers?
(2) "Think about it and do it" question 3.
Observe the meaning of the picture and do it independently. What did you find from filling in this question?
After the students finish their homework independently, they will exchange names (exchange scores and decimals can represent shaded parts or blank parts).
Design intention: connect with life and create a situation. Teachers lead students to measure the length and width of desks in the classroom by hand, with the help of students' existing knowledge and experience-naturally transition from integers and fractions to decimals, attach importance to the relationship between knowledge, initially understand decimals, and recognize and read decimals. ?
(2) Independent inquiry and understanding decimals with the help of commodity prices.
1. Show some commodity prices (pencil 50 cents, student ruler 80 cents, ballpoint pen 1 yuan 20 cents, notebook 3 yuan 50 cents) and ask students to read their prices.
2. Teacher: Can you rewrite the price of goods into yuan as the unit number? What do you think of deskmate communication?
Answer by roll call. Question: Why is 80 points 8/ 10 yuan? Why write 0 to the left of the dot in 0.8 yuan? 1.Why don't 2 yuan and 3.5 yuan write 0?
Step 3 practice
Complete "Thinking and Practice" questions 2 and 4.
Fill in independently, communicate collectively, and choose 1 ~ 2 questions, so that students can talk about their own ideas.
Design intention: The most common decimal in students' life experience is commodity price. Junior three students have more experience in using RMB. Therefore, the teaching of this example adopts the way of independent inquiry and exchange discussion. Ask the students to rewrite a few points or a few yuan points into a decimal with yuan as the unit according to their own life experience. Because most students have practical experience, they can successfully complete the conversion.
(3) Self-study teaching materials to further understand decimals in discussions and exchanges.
1. What else do you want to know about decimals? Please refer to your textbook and find the answer. (Students teach themselves textbooks)
Organize a discussion: What have you read? (Students report, the teacher writes casually on the blackboard)
2. Practice
The following set of data, which are integers and which are decimals? And point out the integer part and decimal part of the decimal.
(1) The length of mechanical pencil is 1.6 decimeter.
(2) Mother's monthly income 1500 yuan.
(3) The price of a coat is 92.5 yuan.
(4) The famous small home is 3.8 kilometers away from the school.
(5) Buy two erasers for 0.8 yuan.
Design intention: Understanding decimals is a leap in the field of students' digital cognition. The study of mathematical facts and laws such as the names of decimal parts, reading and writing methods, descriptive definitions of integers and natural numbers is actually the so-called "declarative knowledge" in the field of knowledge, and it is impossible and unnecessary to conduct inquiry learning. Therefore, it is in line with the characteristics of knowledge types and students' cognitive laws to adopt a meaningful way of accepting and learning at the right time, so that students can read books for self-study, ask questions and answer each other, and teachers can explain them appropriately.
Third, consolidate exercises and expand decimals.
1, with key. (Fraction and Decimal Correspondence Exercise)
2. Think about doing the fifth question. (Decimals on the number axis) Students finish independently, and then exchange names.
Fourth, combine the actual application of decimals.
1, Teacher: What did you gain from this lesson? Students, where have you seen decimals in your life?
2. Teacher: Ancient mathematicians began to use decimals a long time ago. Do you want to know the history of decimal usage? (Introduction)
3. Games: Each student prepares a set of digital cards from 0 to 9 and decimal points, and plays decimal games at the same table.
The Teaching Plan of "Preliminary Understanding of Decimals" in the Third Grade Mathematics of the Second Primary School
Teaching content: the content on page 88 of the textbook;
1, combined with the specific content of decimal, understand the meaning of decimal.
2. You should know that a few tenths can be expressed by one digit, and a few percent can be expressed by two decimal places.
3. Can read and write decimals correctly.
4, through observation, comparison, operation and other learning activities, cultivate students' ability to summarize and return to observation and operation.
5. Let students feel that mathematics comes from life and serves life.
Emphasis and difficulty in teaching
Have a preliminary understanding of the meaning of decimals, and be able to recognize and read decimals below two digits.
Prepare teaching AIDS and learning tools
courseware
Teaching rules:
The teacher instructs on-demand and intensive lectures.
Students teach themselves, discuss and communicate, and practice more.
Teaching design
First, stimulate interest and carry out teaching
1, introducing decimals
Teacher: Students, the teacher brought you some gifts today. Do you want to know what gifts they are, and see what gifts (display courseware) stationery the teacher brought you?
2. Distinguish between integers and decimals
Teacher: OK, please divide these stationery into two categories according to the price.
Show the classification of students and explain the classification standards.
The teacher showed his classification.
Schoolbag: 45 yuan.
Pen: 3.50 yuan
Scissors: 12 yuan
Rubber: 0.20 yuan
Colored pen: 3 yuan
Paper clip: 0. 15 yuan
Step 3 introduce the topic
Numbers like 3.50, 0.20, 0. 15 are called decimals, and this point is called decimal point (blackboard 3.50, 0.20, 0. 15). Today, in this class, we will focus on … decimals (blackboard writing topics).
Second, explore independently and know decimals
1, try reading decimals
Teacher: There are decimals everywhere in life. Can you read these decimals? Please read the price on the screen.
The teacher asked: What does the integer part to the left of the decimal point mean? What does the first number to the right of the decimal point mean? What does second place mean? (points)
Let the students fill in the brackets on the screen.
Summary: How to read decimals? (Re-reading decimal students with blackboard writing)
Have you seen decimals there?
Students answer freely, and the teacher gives affirmation.
The teacher here has some knowledge about decimals. Do you want to know? Please read (showing the collected decimal knowledge map)
4. Summary: In our daily life, it seems that we can not only express the price by decimals, but also express the quality and length.
Third, explore new knowledge, teaching examples
1, report height
After the students reported, the teacher said that just now the students all used meters and decimeters or meters and centimeters as units. If we only want to use rice as the unit of height, what difficulties will we encounter? Now students can solve this problem by themselves.
2. Self-study skills
(1) Read the example 1 on page 89 of the textbook carefully, think about it, and write the numbers expressed by fractions and decimals with what you have learned.
(2) What problems did you find? Talk in the group and try to solve it.
(3) Do it with the learning tools in your hand and fill in the brackets in the textbook.
3. Students teach themselves and teachers patrol and guide them.
4. Communication between teachers and students
Blackboard writing: divide 1m into 10 blocks.
1 decimeter is a meter, which can also be written as 0. 1 meter.
3 decimeters is meters, which can also be written as 0.3 meters.
Seven decimetres is meters, which can also be written as 0.7 meters.
Divide 1 meter into 100.
1 cm is one meter, which can also be written as 0.01m.
3 cm is one meter, which can also be written as 0.03 meter.
18 cm is one meter, or it can be written as 0. 18 m.
5. Panel discussion
Wang Dong's height is 1.30 cm, and the decimal is () meters.
Communicate with the whole class. It is correct to write1.30m and1.3m (because 30cm is also 3m).
6. Show 89 pages and do it. Ask the students to fill in this book and communicate with the class.
Fourth, deepen new knowledge and consolidate practice.
1, do exercise 2 1, the first question.
Teacher-student exchange after the end
Just try it. I can do it.
Students speak and answer, and teachers and students affirm.
Verb (abbreviation of verb) summary and evaluation
The Teaching Plan of "Preliminary Understanding of Decimals" in Mathematics of Grade Three in Primary School
1, Title: Preliminary Understanding of Decimals 2, Contents:
3. Basic requirements:
(1) The trial time is about 10 minutes;
(2) Introducing new courses through problem situations close to students' lives;
(3) Designing mathematical activities to help students know and understand the reading and writing methods of decimals;
(4) Reflect students' subjectivity and stimulate students' interest in learning;
(5) Reasonable blackboard writing.
4. Assessment objectives: activity design, teaching evaluation and teaching implementation. Teaching design
Title: Preliminary understanding of decimals.
Class type: new teaching
Class hours: 1 class hour
Grade: the third grade of primary school
Teaching objectives:
1. Knowledge and skill goal: Know decimals in combination with specific content, be able to know decimals, read and write decimals, and know the actual meaning of decimals in meta.
2. Process and Method Objective: Through rich learning activities such as inquiry, students can correctly understand the meaning of decimals.
3. Emotional Attitude and Values Goal: Experience the connection between mathematics and life and enhance the sense of numbers.
Teaching emphases and difficulties:
Teaching emphasis: be able to read and write decimals and correctly understand their meanings.
Teaching difficulty: understanding the meaning of decimals.
Teaching preparation: multimedia courseware
Teaching process:
First, situational introduction
Talk: Xiaoming's mother prepared a lot of stationery for Xiaoming at the beginning of school. Schoolbag 48 yuan ballpoint pen 3.50 yuan diary 3 yuan pencil 0.20 yuan pencil box 15 yuan eraser 0. 15 yuan knife 1.5 yuan.
Say: Let's take a closer look. Can you divide the figures in these bids into two categories? Who wants to share it? These numbers are not integers. They also have their own names, called decimals. Today, in this class, we will learn some basic knowledge about decimals. (blackboard writing: knowing decimals)
Second, explore new knowledge.
(1) Read decimal
Teacher: The decimal point is pronounced "dot" in decimal system. Can you read the price tag of the knife? (Call the students who want to study, call more)
Teacher: Is this decimal different from others?
Student: There is only one number after this decimal point, and there are two others.
Teacher: Observation is really careful. Like this, the decimal part of only one number is called decimal place, and the decimal part of two numbers is called decimal place.
Teacher: Just now, we read one decimal place. Will you read these two decimal places?
Let the students try it first, and then the teacher summed up the method of reading decimals: the integer part of decimals can be read by integer method, and the decimal part should read the numbers on each digit in turn. )
Teacher: Please ask more students to try to read it. (If there are any reading mistakes, please correct them)
(2) write decimals.
Teacher: We can already read decimals. How should we write them? The order of writing decimals is the same as that of reading decimals. Write the integer part first, then the decimal point, and finally the decimal part. Take the price of a book as an example. The teacher said while demonstrating the blackboard writing.
Teacher: Have you learned? Ok, please write down the prices of other stationery on your exercise paper. (Students practice calligraphy freely, and teachers patrol)
(3) Consolidate the practical significance of decimals in yuan.
Teacher: Did you learn the transformation just now? How about we practice here? Please turn to page 88. There is a table in the middle. Please read the list price of food in the form quietly, and then fill in this form, and fill in a few yuan and a few cents respectively. (After completing the form, say the students' names to answer. )
(4) Looking for decimals in life.
Teacher: Where else did you find decimals?
Health 1: mechanical pencil is marked with 0. 5 mm characters.
Health 2: It's also on the drink.
Health 3: There is a price tag on the back of the book, which is also a decimal.
Teacher: The students have carefully observed it. The teacher also found a few. Let's see: the normal body temperature can reach 37.5 degrees Celsius, and basketball player Yao Ming is 2.26 meters tall.
Third, consolidate the practice.
8.64 yuan =8()6()4 ()
Fourth, class summary.
Did you learn anything from this course?
Verb (abbreviation for verb) assigns homework.