Math composition for the fourth grade of primary school165438+1It's cloudy on Wednesday, October 20th.
misunderstand
In the fourth grade, there was a problem called "wrong solution". Let me give you an example: When Wang Chen used the remainder to calculate the division, he misspelled the dividend 17 1 7, and the quotient was 2 less than the original, but the remainder was exactly the same. What are the correct divisors and remainders?
This problem is actually very simple: 17 1 misspelled as 1 17, and the quotient is 2 less than the original, then the difference between1-17 is the divisor. Now that the divisor is found, it is simple. The topic says that the remainder is the same, and I divide the wrong dividend and the correct dividend by divisor. If the remainder is the same and the difference between the two quotients is 2, then the topic is done correctly. Formula: (171-117) ÷ 2 = 27; 17 1÷27=6……9; 1 17÷27=4……9; 6-4=2。 The remainder is the same, and the difference between the two quotients is also 2. A: The correct divisor is 27 and the remainder is 9.
Wrong solution is really fun!
This semester, our school has implemented a brand-new homework reward system-the red flag star system.
The so-called red flag star system is to change the "work star" on the basis of the small red flag. It is not easy to be a "star of homework". You must first ensure that your homework is serious and correct, and your handwriting is neat and clear before you can get the red flag. Then three red flags are exchanged for a badge, three badges are exchanged for a small certificate, and the last three certificates are exchanged for "Job Star".
At noon today, there was a "long queue" at the entrance of the guidance office. It turns out that the students are all holding exercise books and waiting to exchange red flags for badges. I can't wait to queue up with my exercise book. There are many danger signs in my exercise book. How can I change them? I opened my exercise book and just turned to the lesson "Understanding Proportion". "Yes! Why don't I use proportional knowledge to solve it? " "Three red flags for a badge, three badges for a small card", that is, it takes nine red flags to change a small card. I have 16 red flag. How many small prizes can I get? Assuming that the X plane can be changed, it is 9: 1 = 16: X, and according to the basic properties of the solution ratio, it is X = 1...7, that is, 1 certificate can be exchanged, leaving 7 red flags, and then 7 red flags can be exchanged for 2 badges. In this way, I got a red flag, two badges and one red flag left.
Holding a certificate, badge and exercise book, I am in high spirits and my heart is full of joy. Because I got not only the certificate badge, but also the infinite mystery of mathematics.
I am in the sixth grade this year, and the teacher will naturally change!
Today I'm going to talk about my math teacher. He is a teacher with a very "simple and honest" appearance, with a high nose, a big mouth and that shiny black hair, although sparse. The first time I met my math teacher, my feeling was that the teacher looked fierce, and he was still a man, Amitabha. If I had ten lives, I would have died. Unexpectedly, the math teacher didn't start work for the sake of the gentleman's words, and patiently reasoned with us. He never hits people unless he has to. Ah! This is the teacher I want, and my eyes suddenly filled with light. In class, the teacher always asks us to face the study with 12 points of energy.
However, no matter how precise the cloth is, it also has shortcomings; Even the best calculation will be seen through; No matter how beautiful the words are, there are also shortcomings. There are always a few little mice making trouble here in our class. At this time, if you are targeted by the math teacher, you will be miserable. As soon as the math teacher doesn't hit you: as soon as he doesn't scold you, he will stare at you with his eyes. His glasses are so dazzling under the reflection of light that you can hardly open your eyes. I often tell my deskmate that the math teacher's eyes will "kill people".
My math teacher is too hot. If you take his class, hehe, then you should be careful.
Do you know who my math teacher is? Yes, it is the famous teacher Wu. The math teacher has bright eyes and few wrinkles on his forehead. He looks young and energetic. Actually, the math teacher is over 50 years old.
Teacher Wu is very concerned about and loves us, and often encourages us to refuel, refuel and refuel. On one occasion, my classmates didn't do very well in the math exam. I think Mr. Wu will definitely scold us. But instead of scolding us, Mr. Wu said very gently, "Never mind, just try harder next time." Her words warmed our hearts like spring breeze.
Teacher Wu is very serious in class and lectures very seriously. We don't know. She always explains to us patiently until we understand. However, she got the teacher's occupational disease-pharyngitis, and we were all worried. But for the sake of our progress, Mr. Wu insisted on coming to class, and his voice became small and hoarse. Everyone listened to the class very carefully. Every time I see this scene, I can't help being moved.
Thank you, Mr Wu, for giving us a lot of knowledge. We will cherish your teachings, study hard, study hard, and strive to climb the peak of science.
I admire Mr. Qian very much. She is our math teacher. She is tall and has neat short hair. Her eyes are sharp. As long as anyone is inattentive and makes small moves in class, she will immediately find out, look at him carefully and warn him to pay attention to the class. Her ears are very sensitive. Sometimes there are students whispering in the class, and she will immediately say humorously, "Don't think that I don't know who is talking without looking at you. I have ears! "
Teacher Qian's class is very vivid. Once, when we were taught "Subtraction of abdication within a thousand", in order to make us listen carefully and absorb it more easily, we compared the single digit to the little brother, the ten digit to the second brother, and the hundred digit to the big brother. The original boring formula turned into an interesting story, which made the students burst into laughter. Lively and interesting stories make me feel no more difficult about "abdication subtraction".
Miss Qian always tells us to be careful, and she never lets go of our little negligence. Even if "Le" is written a little like "3" or "Qian" is written a little like "4", she will not let us go easily, and she will let us correct it in time. And patiently teach us, let us understand the truth of "small mistakes and big problems."
Teacher Qian is a good teacher with a great sense of responsibility and love. She taught us a lot of truth, and I want to keep it in mind and be a careful child.
Our math teacher Wang is very tall and likes to wear black clothes. There are some small peas on the melon face. Miss Wang is fine, but she has a short temper. Still handsome, though.
Teacher Wang lives downstairs in our house, and his classmates will never come to my house again when they know about it.
Teacher Wang has a good way to deal with those who answer his words. In the first class on Wednesday morning, Sweet Tang accidentally picked up a sentence, which made Teacher Wang very angry. Mr. Wang thought for a moment and said, "Well, write a 400-word critical letter and give it to me this afternoon." But she wrote it in the fourth class. Hand it in. When Mr. Wang saw it, he said it was not enough. She said with tears, "I can't write that many words." Teacher Wang said, "Aren't you fine? Edit if you can't write it. " Sweet Tang pursed her lips. Her lips were wide enough to hang an oil bottle. In the past, we met Mr Rainbow just like a mouse meets a cat. Now Mr. Wang is better than before.
Another time, because there was going to be a blackboard newspaper on Monday, I played chess, two best partners, and prepared to publish a blackboard newspaper together. She is in charge of writing, and the next thing is what I have to do. After a quick chess meal, my family rushed back to make a blackboard newspaper. There was a man on the chair in front of our house, and I didn't take it seriously. When we walked in, we found that it was Miss Wang, and we both gasped. Walking to the front, we both said hello to the teacher and opened the door and ran up. On the fifth floor, I heard the old city say, "These two people don't have to be so scared when they see me."
Do you know why I like math? Because mathematics is attractive, I am deeply attracted by it.
Today, I learned a new knowledge, that is-Jia. Simple operation of subtraction. I learned to add. Simple subtraction method, my operation speed is much faster. Give an example! For example: 458+347+253=? A week ago, the method was to calculate from left to right. Now, I can use the law of addition and combination to calculate quickly: first add the last two numbers 347 and 253 to make 600, and then add it to the first addend. Add 367+498, I rewrite it to 367+500, add 2, so 867 MINUS 2 gets 865. Look, how convenient it is!
After learning the simple arithmetic of addition, it will be much easier to learn the simple arithmetic of subtraction For example: 483-299, hey, hey, I have a slight brainwave. I'll take 299 and subtract it from 300, because it's 1, so just add 1 to the result, and it's 483-300+ 1= 184, which is much easier. But I can remind you: it's best not to think about the minuend when you do subtraction, or you'll be in trouble!
Now, I like math more and more, and math really makes me remember deeply!
In my impression, the teacher who impressed me deeply was none other than my math teacher.
Last summer vacation, I heard that a new teacher was coming, and everyone discussed: "I hope the teacher is a man, and I hope the teacher will be better to us." ..... "Ding" was having a class when a teacher in his thirties came in from the outside. You see, his height 179 cm, like a soldier, his hair stands on end, and his bright eyes look at everyone.
Teachers have two characteristics: 1. Teachers like procrastination. Once, the bell had reached the ears of the whole class, but the math teacher didn't seem to hear it and spoke more vigorously. We have no choice but to listen. Finally, the teacher said the class was over, but after a while, the bell came to my ears again. I thought to myself at this moment: the teacher really dragged her to class.
The second characteristic is easy to get angry. Once in class, the teacher assigned us many questions and asked us to finish them in 10 minutes. How can we do it so fast? How time flies! 10 minutes arrived at once, but I only did half of it. As soon as the teacher checked and saw our listlessness, he suddenly flew into a rage and said, "You are really useless. You can't even finish this. What kind of student are you? " Do these questions for me 10 times. "It's all over. The teacher's anger brought us great misfortune.
This is my math teacher. Although he may be bad in your eyes, in my heart, I still think he is a serious and responsible teacher.
Xu teacher is of medium height, and she walks in high spirits. Her eyes are bright, and in her eyes, we can see his expectation and severe criticism ... xu teacher speaks very gentlemanly and polite. Although he is a math teacher, his eloquence and writing are not bad.
Xu teacher never "bullies" his classmates with his own identity. I will never forget the first class that started this year. She said, "You still know me after a holiday. My surname is Xu. " Before the words were finished, a classmate shouted, "xu teacher, I love you." The students all laughed, and the classroom atmosphere was much more active.
Xu teacher is an excellent math teacher, and everything he did for me is deeply left in my mind. I remember when I first went to school, the foundation was not very good. Xu teacher always gives up his rest time to make up lessons for me. Give me encouragement whenever I make a little progress, and let me find the fun and confidence in learning. His patience is surprisingly good. Sometimes I ask her some questions that I can't meet. No matter how busy she is, she always patiently explains to me until I understand.
"Spring silkworms weave until they die, and candles drain the wick every night." A poem praising the teacher is completely correct. It is with the help of my teacher that I will grow up. I am very grateful to my teacher for his education.
My math teacher's name is Jiang Hua, and now she is in her twenties. Teacher Jiang not only teaches mathematics, but also teaches science, synthesis and practice, and learns to be a man. Teacher Jiang has a pair of pale curved eyebrows. She has big watery eyes, a high nose and thick lips. She is very beautiful and is our beauty teacher.
Teacher Jiang is cheerful and seldom gets angry. One winter morning, Teacher Jiang took us to the playground to play with snow. Boys and girls were having a snowball fight. Lv Jingyu tried to hit me, but she hit Miss Jiang. Teacher Jiang patted the snow on her body and said with a smile, "Nothing, I want to play with you." In a short time, all the boys were defeated by us.
Teacher Jiang is very careful in class and never misses a question. We didn't understand, so the teacher said it again. Once, I had a smart house that I couldn't do. Teacher Jiang told me three times before I did it. Teacher Jiang taught me again and again, which made me get good grades again and again.
Teacher Jiang likes reading books, especially Harry. Porter. I can see Mr. Jiang looking at Harry when I hand in my homework several times. Porter.
Teacher Jiang is a good teacher, and I love my teacher.
I have seen such a news that people's hearts are as big as fists. Today I will measure my fist and know how big my heart is. But our fists are irregular objects. How should we measure them? After much deliberation, I finally came up with a good idea, which is to measure potatoes with water, because in our practice class, we measure potatoes with water!
I found a hollow cylinder with a radius of 4 cm and a height of 9 cm. I filled it with water, then put my fist in it, and the water immediately rose, and then I took my fist out. The water surface immediately dropped from 9 cm to 4 cm. I calculated the volume of my fist with the square of 4× 3. 14× (9-4), which is about 25 1 cubic cm.
After I measured the volume of my fist, I was still not sure whether it was correct, so I used another experiment to prove that it was 250 cubic centimeters, which was not much different from the last time.
This experiment tells me that as long as you dare to explore, you will get unexpected gains. "Practice makes true knowledge!"
Math composition for the fourth grade of primary school 12 I remember when I was in the first grade, I was really not interested in math. However, since Mr. Qian's math class began, I began to like math classes.
Mr. Qian wears a pair of thick glasses and his hair is sparse and slightly bald. At first glance, many people will think that Mr. Qian is an unsmiling and stupid scholar. But every day when it is cold, he often wears trade outside his shirt, which looks very stylish.
Mr. Qian doesn't like to talk very much at ordinary times, and his speech in class is very characteristic. His voice is very low, but his speech is very clear and his Mandarin is very standard. He often smiles in class. Teacher Qian also has a unique skill, that is, no matter how profound and difficult the theory is, it can also be expressed through humorous language.
In Mr. Qian's math class, the atmosphere is often the best. It is easy for us to grasp the knowledge points, and students are willing to raise their hands and speak actively. I like Mr. Qian's class, but I can't help liking math. Faced with difficult problems, I no longer feel worried. In every math class, I gradually learned to think carefully about the knowledge points mentioned by Mr. Qian, and had a deeper thinking and analysis.
Thank you, Mr. Qian. Because of your teaching, my math class is full of fun.
At noon today, the weather is particularly sultry. I just arrived at school. Before entering the door, Jin can came out of the classroom and told me that I only got 88 points in math this morning. I don't think so. I think Jin Jin is scaring me, because I have never done so badly in the exam! Not long after I walked to my seat, Chen Yiyi in the front row told me that I only got 88 points in the math exam this morning, which made me feel bad. But I still think it is impossible, because the topic of the exam is very simple. I finished it in a short time and checked it twice!
I got the test paper with trepidation, and I couldn't believe what I saw was really an "88" score that I couldn't believe. At that time, my heart was as painful as a knife, and tears of regret quickly overflowed from my eyes. You know, this is the worst exam result since I studied!
I silently corrected the wrong questions on the test paper carefully, and then showed them to the teacher for correction, thinking that the teacher would criticize me. Unexpectedly, the teacher said to me, "It doesn't matter if you don't do well in this exam. As long as you study hard, I believe you will get good grades next time." Listening to the teacher's words, my tears can't stop flowing down.
As soon as the bell rang, I went back to my seat and thought, yes, I can't be crushed by failure. I must pull myself together. I adjusted my mood and began to take classes seriously.
In our daily life, we will encounter many interesting mathematical problems, such as reasoning, periodicity, planting trees and so on. The kingdom of mathematics is really wonderful, but it often makes you elusive and even fantasize!
I remember when I was in kindergarten, I liked to climb stairs and count the steps at the same time. My family lives on the sixth floor, and there are 18 steps between each floor. Every time I leave home, I have to hold my mother's hand for a few steps, 90 steps at a time. My mother always praises me for my cleverness.
In elementary school, after learning simple multiplication, I didn't even think about it. Every time I go home to the sixth floor, I have to climb 108 steps. Because I live on the sixth floor, and each floor has 18 steps. According to the principle of multiplication, 6 18= 108 steps. But every time I go home, I actually only need to climb 90 steps. I hit a big "?" No, I don't know why. So I asked the resourceful star in my family with a puzzled face. Dad. Dad smiled after listening, but didn't explain anything. He took my hand and came to the first floor. He smiled and said, "Kid, if we live on the first floor, do we need to climb 18 steps?" How many steps do I have to climb to live on the second and third floors? You climb again and experience it. "I listened to my father and I accepted"? "I experienced it again. As a result, there was no need to climb on the first floor, but on the second floor 18, the third floor was only 36, so I climbed to the seventh floor 108. Through these experiences, I suddenly realized that I had found a rule:
Number of steps to climb on the floor
1( 1- 1) 18
2(2- 1) 18
3(3- 1) 18
……
n(n- 1) 18
Today, I followed my mother to the market to buy food. Mom said, "I will test you today. Will you buy a dish you like?" My mother gave me 20 yuan to watch my performance. "Make sure the task is completed." I said confidently. So, I walked and watched, and came to the vegetable area. At this moment, I saw an aunt selling white and tender fresh mushrooms. I think: the leftovers at home can be cooked with mushrooms. So, I asked the aunt who sells vegetables: "Aunt, how much is a catty of mushrooms?" Aunt smiled and said to me, "Little friend, this mushroom is 7 yuan a catty. How many Jin do you want to buy? " "Aunt, I only need to buy half a catty." I think: 7 divided by 2 equals 3. 5 yuan, 20 MINUS 3. 5 equals 16. 5 yuan. I thought about it and gave my aunt a note of money from 20 yuan, reminding her to call me at 16. 5 yuan. I went to the meat department again and saw an uncle selling meat, so I asked, "Uncle, how much is a catty of meat?" "10 yuan a catty." "I want to buy a catty of this." On second thought: 16. 5 minus 10 equals 6. 5 yuan. I play 16. 10 yuan in 5 yuan was given to this uncle.
When I came out of the market, my mother saw that I had both meat and vegetarian dishes. When I was in 5 yuan, I smiled and said to me, "Learn to buy food!"
Through this test, I feel that there are many mysteries of mathematics hidden in our lives, and the ability to learn mathematics is really important. Besides, we should not be proud. We should study hard and master more math skills in order to apply what we have learned and solve the problems around us.