Lesson 1 of Cat in the second volume of Grade Four
First, learning objectives:
1 Know four new words.
2 Read the text correctly, fluently and emotionally.
3 understand the meaning of profound words and phrases, and understand the subtlety of the author's language.
4 Understand the author's
perception of life, and establish fearless courage and confidence.
second, learning is important and difficult:
the key point is to understand the author's emotional changes.
Third, the learning process:
One class
First, stimulating interest:
Teacher's lead: "Spring is full of vitality, green everywhere, birds and flowers everywhere. The delicate and charming flowers are not the most colorful ones in spring. It attracts countless literati with its colorful colors, delicate posture and quiet atmosphere. However, how do you feel about thousands of small flowers blooming in the cold wind?
blackboard writing topic: 2* flower courage
study hard, I believe you will gain something.
Second, the main idea of the first reading:
1 Group cooperation: check each other's texts, question each other and ask difficult questions. Write down the problems that can't be solved first and leave them for the whole class to talk about.
2 Self-study feedback:
Read the text according to the natural paragraph by name, and the teachers and students * * * have the same pronunciation.
teachers and students * * * ask questions with difficulty.
3 overall perception of the main idea of the text:
Say: What did the author experience in Vienna?
Third, read carefully to clarify the context:
1 What impression did the spring in Vienna give the author six? How has his feelings changed? Read the text silently, draw words that show the author's emotional changes, and think about it in context. Why is there such a change?
2 Ask the students to write the words that express the author's emotional changes on the blackboard, and the teacher will guide the students to sort out the clues of the article and the author's emotional context.
Fourth, read and feel the beauty:
1 Read your favorite parts several times, circle the subtleties, taste them repeatedly, and try to figure out the author's inner feelings. You can exchange views with your classmates when necessary.
2 Literary Appreciation Meeting:
The teacher plays the host of the literary appreciation meeting: Dear literary critics, you have repeatedly read the prose fragment "The Courage of Flowers" by the famous writer Feng Jicai. Now, please express your opinions on whether the language in the text is beautiful and whether the words and sentences are accurate and vivid.
Teachers guide students to taste the meaning of what they say and realize the truth of what they say.
5. Reading the beauty into the scene:
1. Read the full text with emotion according to the author's emotional changes.
2 Hold a reading contest and judge the winners.
6. Read back and express your feelings:
Life is precious, but it is short. A philosopher once said: We can't control the length of life, but we can decide the width of life. Students, after learning this group of texts, when you cheer for the seedlings growing tenaciously in the cracks of bricks, when you are shocked by the moths struggling to survive in desperation, and when you are moved by the blind girl who feels the spring in the flowers, what new understanding and feelings do you have about the meaning of life? Please record your thoughts and feelings in your diary.
After-class reflection:
Lesson 2 of Cat, the second volume of Grade Four
Teaching objective:
Knowledge and skill objective:
Through the analysis of practical problems, students can further understand that equations are an effective mathematical model to describe the real world, and have a preliminary grasp of solving application problems with binary linear equations, and have a preliminary understanding of the basic idea of "elimination" of binary linear equations.
Cultivate students' consciousness of solving practical problems by solving equations, and enhance students' mathematical application ability.
process and method objective:
experience the process of solving practical problems by the system of equations, and further realize that the equation (group) is an effective mathematical model to describe the real world.
Emotion, attitude and values:
1. Further enrich students' successful experience in mathematics learning, stimulate students' curiosity in mathematics learning, and further form the consciousness of actively participating in mathematics activities and actively cooperating and communicating with others.
2. Bring students into the ancient mathematics problem scene through "chickens and rabbits in the same cage", and students will realize the "interest" in mathematics; Further emphasize the connection between classroom and life, highlight the practical value of mathematics teaching and cultivate students' humanistic spirit. Key points:
Experience and experience the process of solving practical problems by the system of equations; Enhance students' mathematical application ability.
Difficulties:
Establish the equivalence relation and list the correct binary linear equations.
teaching process:
review before class
review: the general steps of solving application problems by listing equations in one yuan at a time
situational introduction
exploration 1: There are chickens and rabbits in the same cage today,
there are thirty-five heads above,
there are ninety-four feet below,
What are the geometries of chickens and rabbits?
topic of "pheasant rabbits in the same cage": Today, pheasant rabbits are in the same cage, with 35 heads on the top and 94 feet on the bottom. What is the geometry of pheasant rabbits?
(1) Drawing method
Draw 35 heads first
Think of all heads as chickens and legs, and draw 7 legs
There are 24 legs left, adding two legs to each head, ***12 heads with two legs
Rabbits with four legs (12), Two-legged chickens (23)
(2) One-dimensional linear equation method:
chicken head+rabbit head =35
chicken foot+rabbit foot =94
Suppose there are x chickens, then there are (35-x) rabbits, according to the meaning of the question:
2x+4 (.
Looking back at the binary linear equation we learned last class, can we solve this problem?
(3) Binary linear equation method
Today, there are chickens and rabbits in the same cage, with 35 heads on the top and 94 feet on the bottom. What are the geometries of chickens and rabbits?
(1) There are 35 heads on the top, which means that chickens and rabbits have 35 heads, and
There are 94 feet on the bottom, which means that chickens and rabbits have 94 feet.
(2) If there are x chickens and y rabbits, then chickens and rabbits have (x+y);
There are 2x chickens; There are 4y rabbits.
Solution: There are X chickens and Y rabbits in the cage, which can be obtained from the meaning of the question:
The total number of chickens and rabbits is xy35 feet 2x4y94
To solve this equation group:
Exercise 1:
1. Let the number of A be X and the number of B be Y, then "the number of A is twice that of B. The listed equation is _ 2x+5y = 15.
2. Xiaogang has a number of 5-cent coins and a number of 1 yuan coins, and the currency value * * * is 6 yuan and 5 cents. Let 5-cent have X coins and 1 yuan has Y coins, and the listed equation is 5x+y=65.
3. Cooperative exploration
Exploration 2: Logging with rope. If the rope is measured by three folds, the rope is five feet more; If the rope is measured by four folds, the rope is one foot more. What are the geometries of rope length and well depth?
main idea of the topic: use rope to measure the depth of a well. If the rope is divided into three equal parts, the length of one rope is 5 feet longer than the depth of the well; If the rope is folded into four equal parts, the length of one rope is 1 foot longer than the depth of the well. How long is the rope and how deep is the well?
Find the equivalence relation:
Solution: If the rope length is x feet and the well depth is y feet, then x = 48
will be x=48y=11 from the meaning of the question.
so the rope is 4811 feet long.
think about it: find a simpler innovative solution?
Guide the students to work out a simpler method step by step:
Find out the equivalence relation:
(well depth +5)×3= rope length
(well depth +1
Solution: if the rope length is x feet and the well depth is y feet, then we can get
3 (y+5) = x
.
Exercise 2: A and B run a race. If B runs 1 meters first, A can catch up with B in 5 seconds. If B runs for 2 seconds first, A can catch up with B in 4 seconds. Let A's speed be x m/s and B's speed be y m/s, then the equations can be listed as (b).
Summary:
General steps to solve practical problems by listing binary linear equations:
Review: Check the equivalence relation in the questions.
Suppose: Set the unknown. Find the unknown number.
Answer: Check whether the unknown number meets the meaning of the question, and write the answer.
Fourth, think independently
Inquiry 3: Use rectangular and square cardboard as the side and bottom to make two kinds of open cartons, vertical and horizontal, as shown in the figure. At present, there are 1 square cardboard and 2xx rectangular cardboard in the warehouse. How many cartons are made for each of the two types, just to make the cardboard in stock run out?
solution: let's make x vertical cartons and y horizontal cartons. According to the meaning of the question, it is
x+2y=1
4x+3y=2xx
to solve this equation group, it is x=2
y=4
A: Let's set 2 vertical cartons and 4 horizontal cartons, which just makes the stock of cardboard run out.
exercise 3: if 5 square cardboard and 11 rectangular cardboard are stocked in the above question, can you just use up the stocked cardboard after making several vertical cartons and several horizontal cartons?
Solution: Let's make x vertical cartons and y horizontal cartons. According to the meaning of the question,
y is not a natural number, which doesn't fit the meaning of the question, so it's impossible to make several cartons, and the cardboard that just isn't in stock is used up.
Summary:
V. Assessment of reaching the standard
1. Solve the following application questions
(1) Buy some 4 points and 8 points.
solution: there are 4 stamps x and 8 stamps y, which means:
4x+8y=68①
y-x=4②
Therefore, there are 54 stamps with 4 stamps and 58 stamps with 8 stamps
(2) If it is all sunny in a project, It is now known that there are 3 days more rainy days than sunny days during the construction period. How many days will it take to complete this project?
Analysis: Because the total amount of work is unknown, we set it as unit 1
It can be completed in a sunny day
It can be completed in a rainy day
Solution: Let it be sunny x days and rainy y days, and the total amount of work is unit 1, which means:
Total days: 7+1=17
Therefore, Among them, the number of pencils is four times that of ballpoint pens. Known pencils are .6 yuan each, ballpoint pens are 2.7 yuan each, and pens are 6.3 yuan each. How many pens are there in each of the three types?
analysis: number of pencils+number of ballpoint pens+number of pens =232
number of pencils = number of ballpoint pens ×4
price of pencils+price of ballpoint pens+price of pens =3
Solution: suppose there are x pencils, y ballpoint pens and z pens, and according to the meaning of the question, we can get a ternary linear equation set:
Substitute ② into ①. The binary linear equations
4y+y+z = 232④
.6× 4y+2.7x+6.3z = 3⑤
are solved
So, there are 175 pencils, 44 ballpoint pens and 12 pens
VII. Experience and gain
1.
x+y = 35
2x+4y = 94
x = 23
y = 12
one third of rope length-well depth =5
one quarter of rope length-well depth = 1
-y = 5 ①
.
-y = 1②
-y = 5①
-y = 5①
-y = 5①
x = 54
y = 58
y-x = 3②
x = 7
y. > y=44
z=12
The lesson plan of Cat in the second volume of Grade 4
1. Teaching purpose
1. Stimulate students' interest in learning English, cultivate their positive attitude towards learning English, and enable them to initially establish their self-confidence in learning English;
2. Cultivate students with a certain sense of language, a good foundation of pronunciation and intonation, and good study habits;
3. Make them have the ability of simple daily communication in English.
4. At the same time, cultivate students' abilities of observation, memory, thinking, imagination and creation.
5. Introduce Chinese and Western cultures appropriately, cultivate students' patriotism, strengthen the world will, and lay a good foundation for students' further study.
second, teaching material analysis
? English, a compulsory education curriculum standard experimental textbook, is used from the third grade. It is a brand-new English textbook for connecting middle and primary schools, which is compiled by People's Education Publishing House and lingo.media International Group of Canada. This textbook is compiled according to the National English Curriculum Standard and the Basic Requirements for English Teaching in Primary Schools formulated by the Ministry of Education. This book is for use in the first semester of the first school year in schools offering English starting from the third grade of primary school.
? The design and compilation of compulsory education curriculum standard experimental textbook English embodies the inheritance and development of foreign language teaching thought. On the basis of analyzing and studying many kinds of English textbooks for primary schools at home and abroad, taking their essence and learning from others, a unique compiling system of this set of textbooks has been formed. At the same time, we have absorbed the theories and successful experiences of English as a foreign language teaching at home and abroad, and combined these teaching theories and practical experiences with the reality of foreign language teaching in primary schools in China, so as to form the foreign language teaching mode and teaching method of English in primary schools in China.
This textbook has the following characteristics:
1. It pays attention to the cultivation of students' language application ability, highlights the practicality and communication of language, and also highlights the authenticity and practicality of language.
2. Pay attention to the cultivation of students' self-study ability and learning strategies, and lay a foundation for students' further study or lifelong study.