Math Grade Five Composition 1 I have some opinions on multiplying two digits by two digits. Among them, not all of them need column vertical calculation. There are many kinds of two-digit multiplication. Let me name five of them first. 1. The sum of digits is equal to 10, and the ten digits are the same. Second, ten digits add up to 10, and the digits are the same. Third, the addition of ten digits and one digit is neither equal to 10, nor the same, which is irregular. Fourth, the sum of digits is equal to 10, but the ten digits are different. Fifth, the ten digits add up to 10, but the digits are different. Sixth, of course, I don't know everything, but I know a little. At least I can write the first three simple methods.
Let me list a few questions: the first question, what is 8684=? 86 and 84 bits add up to 10, and the ten digits are the same. This is the first case. It can be calculated as follows: 8+ 1=9, 89=72. At the end of 46=24, the result of 89 is the product of hundreds and thousands, and the result of 46 is the product of tens and hundreds. The product of this problem is 7224. The second question, 3452, belongs to the third kind. It can be multiplied by addition and completed in three steps. The first step is to multiply 24=8, and the end of the product is 8. The second step is to cross multiply and add 45+32=26 and write 6 as 2. Step 3: Multiply the ten digits by 35= 15, and 2 plus 15 equals 17. The product of this problem is 1768. The third question, 6848, belongs to the second kind. The sum of ten digits is equal to 10, and the digits are the same. With 64=24, 24+8=32, the product of thousands and hundreds is 3 and 2. Finally, the final multiplication, 88=64, decimal digits and single digits are 6 and 4, and the product of this problem is 3264.
And of course, the finger algorithm. Without saying much, I won't introduce them one by one. After reading my method, do you think it is mine or the old-fashioned method in mathematics?
Today, a fat, dark Chinese-American teacher gave us a lively and interesting math lesson.
After class, the teacher released "6.25" and a big red question mark on the slide. She said in very blunt Chinese, "You, take out a blank piece of paper, fold it in half, and draw a 6.25 you think on a quarter of the paper in just one minute." We started writing at once, and it passed in a blink of an eye. The teacher asked us to lift the painted pictures to our chests, but some students' papers were blank and dared not lift them. The teacher saw it and smiled and said, "You can't figure it out. It doesn't matter in my class. You see how others draw! " "After that, the teacher asked Yuen Chan Kwon, whose grades were average, to lift the picture. Many students were amused by his clumsy movements. However, the teacher said with great appreciation, "it's very interesting, how different!" How clever the children in China are! " She added, "I like it very much. Can you drive me? " Yuen Chan Kwon nodded excitedly. However, in our usual class, Yuan seldom gets praise and affirmation from teachers. Now we find him so cute and unique!
Next, when Hu Xie bravely raised her problematic painting, many students spoke, "Huh?" Give a shout. The teacher encouraged her: "Don't be afraid, it doesn't matter if you do something wrong. You're right. It's good. You can set an example for your classmates. Wrong, it doesn't matter, you can stand up from where you are, it will be better! " What sweet words! We all like to be loved and encouraged by teachers!
Time still flies too fast. I wanted to play a decimal game, but when the bell rang, many students sighed with regret. We feel respect, affirmation and encouragement in her class, and everyone is reluctant to leave such a teacher!
In the first math class of grade five, we met an interesting math teacher. In her class, you can always hear bursts of laughter, but when she loses her temper, she is like a tiger going down the mountain.
Strange to say, one morning, when we were preparing for math class, the room was very noisy. Some people are playing games, some people are still reading extracurricular books, and some people are even fighting until the math teacher walks into the classroom. But that day, the math teacher didn't fly into a rage. Maybe she's too sad. Our math teacher actually cried. This scene shocked our class. Although I didn't finish my math class that day, I learned a lot from it.
Through this incident, I know that the math teacher and other teachers have put a lot of effort into us, but the most prominent one is the math teacher. The math teacher talked with us about a class that day, and sometimes I found that the math teacher really had good intentions! In our class, the math teacher told all the knowledge vividly, and made up many hilarious animated stories, for fear that we would not remember them.
But it was this beloved teacher who was made to cry by us, which made people feel ashamed to think of it. But math teachers are not always worried about this. After a day, her mood changed from cloudy to sunny, and the lecture was as vivid and colorful as before, but it made me even more sad.
From this incident, I deeply realized the care of our math teacher, and I like our math teacher who loves to cry.
There is a story in composition 4 of the fifth grade of mathematics. Once upon a time, in a big garden, there was a big strong banana and a tender little banana beside it. The big banana lost all its nutrition to the small banana, making it grow sturdily, but slowly withered.
The big banana in the story reminds me of our teacher. Aren't they just like the big bananas in the story?
Our math teacher, Miss Pan, often wears a suit and shoes and has beautiful black hair. 360 is handsome and has no dead ends.
Whenever I study geometry, Miss Pan comes into the classroom. A triangular ruler with clothes under his arm, a textbook in his left hand and a stack of tutorial cases in the form of natural drooping in his right hand. Teacher Pan is very active in teaching, but he is not a gentleman at all. Every time he finished writing on the blackboard, he turned smartly, nodded to his classmates with elegant movements and answered his questions. Every time Mr. Pan laughs, the left corner of his mouth tilts slightly, and then the right corner tilts, like a crescent moon, curved, so lively and handsome when he laughs. Every time Mr. Pan enters the classroom, he will say: Take out the tutorial. After a long time, it naturally became a mantra. Every time there is a tutorial, his first sentence after entering the classroom is: take out the tutorial. After a long time, we also realized that in the future, we used to take out the tutorial plan before each class, and we can still hear his words today. Teacher Pan never hits people, and is tolerant and generous. Sometimes people break the rules. He will never come and hit you, but he will stare at you from a distance with sharp eyes. Until you realize it's quiet. Our teacher Pan has a unique teaching method and is a good teacher. Look! This is our handsome, tolerant and unique teacher.
After lunch at noon, I had nothing to do, so I picked up a book called "Top Student Question Bank". Open the chapter on negative numbers, read the previous explanation, and turn to the exercise section to do exercises. I watched the exercises first. Although there is a lot of content, it is easy. Thinking, "Hi! This is also called "top student question bank". It's so simple that I can do it with my eyes closed. "
So, I began to do the questions, fill in the blanks and judge the questions. I made two pages in a short time. Speaking of application problems, I thought it would be more difficult, so I read it carefully. This is not difficult at all. After two or three strokes, only one application problem was written. It's easy to read the questions on the grass. No, it's accelerated. What are these "+15" and "-15" for? I'll think about it. I just can't answer the question. I read the question again, but I still can't. At this time, I thought of a formula I saw in a book, which seemed to be just right for this problem. I quickly turned out all the reference books on mathematics I bought, and read and reread them. Why not? I clearly saw this formula in the book, how could I not find it? Facts are facts, so I flipped through the back answer: 200 ÷ (35+15)+200 ÷ (35-15) =14 hours. Why divide 200 by 35? At this time, in the question of travel, I picked up the book "General Review of Primary School Graduation" and turned to the page about travel. There is a formula that makes me suddenly realize that it is like this: distance divided by speed equals time, and these plus fifteen and minus fifteen are addition and subtraction, not symbols.
Math problems really need to be understood carefully!
Composition 6 in the fifth grade of mathematics has a short gray hair and some baldness, like the Mediterranean; A pair of clever little eyes radiate sharp light from time to time, as if they can see through you; Clothes dominated by dark tones are capable. Yes, he is my math teacher, Miss Wang.
Teacher Wang is very careful in class. There are many examples of lesson preparation notes, and the class is also very enthusiastic. Look, he hit the nail on the head. He picked up a piece of chalk and scribbled on the blackboard quickly. That's it. Put your hands behind your back and talk about the definition. After that, he looked at our upturned faces and asked us loudly, "Do you understand?" There was a loud response from below.
However, don't be absent-minded in teacher Wang's class. Liu Peng often speaks in class. Finally, the teacher couldn't help it, picked up a piece of chalk, aimed at it and shot it, right in the head! Liu Peng looked at the teacher doubtfully, but after touching the teacher's eyes, he pushed his glasses nervously and sat up straight, and the atmosphere in the class immediately became dignified. In fact, Mr. Wang is only so strict in class and is very kind after class.
Teacher Wang has a stunt, that is, mending curtains. The curtains in our class have a long history and are very dirty. Rest. Ugly, etc , in a person can be ignored, but often fall off. So the teacher "dressed up" himself. A bench was piled up on the desk of a classmate. The teacher moved his "old arms and legs", crawled awkwardly, grabbed the hook in one hand and held the curtain in the other, stretched out his arm hard, and finally hung the curtain. Panting, he jumped down, his head shining and his clothes gray. However, seeing that the students were not disturbed by light, the teacher smiled with relief.
This is my math teacher, a strict but amiable teacher.
Time flies, leaving many people's shadows and many unforgettable or incomplete memories in my mind. In my life, there are many people who are my role models, and many people will leave a deep memory for me ... Today, I will introduce our math teacher.
Our math teacher is Miss Li. She has short curly hair, bright eyes, a gentle mouth, medium build and often wears dark clothes. Teacher Li is amiable.
During the lecture, she spoke very carefully on the platform, and she would tell us what she didn't know in the book. When she gives a lecture, if someone doesn't listen carefully, she will criticize him with her eyes. Miss Li is a serious and responsible teacher.
In the next class, some students have some questions that they don't understand. Teacher Li will patiently tell him. Sometimes Miss Li talks and laughs with us, which is very humorous. She will also share some interesting things that happened in her life with us. Teacher Li is a very humorous person.
At lunch, Mr. Li asked the students to cook first, and then do what you should do after eating. After cooking for us, she always asks, "Is there enough to eat? Give you some more? " In this way, Miss Li finished our meal quickly. She said to us, "Finish your meal early, go downstairs and play for a while, and get some fresh air." Teacher Li is a crisp and neat person.
Miss Li is a good teacher. She left a deep impression on me.
I have been studying mathematics for three or four years. Although the study is not very good, but also summed up some learning experience. I believe these thoughts and gains will definitely help us learn math well.
First of all, when studying mathematics, we should read more textbooks. Textbooks are our most basic topics, which can make us learn more solidly. Once, I did it because I got the topic, but I basically didn't understand it. As a result, I made many mistakes, but I wasted my time and energy.
Secondly, we should have the spirit of not being afraid of difficulties and being brave in asking questions. I remember the last exam, and I didn't do very well. When reviewing, I am afraid of the teacher's criticism and work hard at the bottom. As a result, I revised it five or six times, but it was still wrong. Finally, I asked the teacher to nod. Although she didn't show it on her face, I felt embarrassed. As a result, under the guidance of the teacher, I finally understood the ins and outs of this problem. It was at this time that I realized the benefits of asking more questions if I didn't understand. Also, if you are not afraid of difficulties, the harder the problem is, the easier it will be to do simple problems in turn. It's like a person carrying a burden. When you carry 50 kilograms, you will feel relaxed when you come back with 30 kilograms on your back.
Finally, don't be afraid of making mistakes. Raise your hand more in class, and don't be afraid to raise your hand when you make a mistake, because your impression will deepen after you make a mistake, and you won't make any mistakes in the future.
I said something from my heart, and the most important thing is concrete practice. Anyone can talk big, but it's hard to really do it. Including summing up the above experience, I can't do it. So please act with me, I believe we can learn math well.
Can you find the mathematics in life? In fact, there are many mathematics in life, such as weight and percentage, which are very common in life. Even the RMB contains mathematics!
Supermarket is the place where we often go. Whenever cashiers and aunts change money, we can see a lot of neatly collected RMB, including 1 jiao, 50 jiao, 1 yuan, 2 yuan, 5 yuan, 10 yuan, 50 yuan and 100 yuan. When we see so many denominations of RMB, a question will quietly come to mind. With such questions, I couldn't sleep for a long time, so I got up and studied the problem thoroughly. After thinking about it all night, I understand the reason: because 5 1 angle =5 angle, if there is no 5 angle, it is not convenient for you to find a lot of 1 angle when shopping, but with 5 angle, you can find 5 angle and 5 angle. If it is less than 5 corners, you can use 65438 again. And five 1 yuan equals 5 yuan, just like 1 angle and 5 angle, so the design will be much more convenient, and so will the integer. However, why not design 30 yuan, 40 yuan and ten yuan? Because 1 20 yuan plus 10 yuan equals 30 yuan, other denominations can be freely combined. If there are many designs, it will be more troublesome.
Mathematics in life is not only modern, but also ancient! Everyone has heard the story that Cao Chong called an elephant. Replacing the elephant's weight with a stone equal to the elephant's weight is also mathematics.
Facts have proved that mathematics is everywhere. As long as we observe more, think more and ask more questions in our life, we will certainly find a lot of interesting mathematics.
On Friday, Teacher Lu took us to play a little math game-grab 30. The rules of the game are simple, that is, talk to 30 before talking to others. Everyone can say at most three numbers at a time, at least one number, starting from 1, and the person who says 30 wins.
This game looks simple, but it is different to play. We played with the teacher several times and the teacher won. We are not convinced and want to compete again. The teacher agreed to our request and asked us: Please raise your hand if you think you can win. As soon as the teacher's words fell, the students raised their hands. After several rounds, the teacher still won. The teacher asked us: Have you found any rules? I thought about it and said, whoever says 26 first will win. The teacher smiled and asked, is there anything simpler? Seeing the silence in our class, the teacher said: If you want to grab 26, you must grab 22 first. If you want to grab 22, you must first grab 18, and so on, that is, grab these numbers. The teacher also asked: Do you think the chances of winning the game first or later are greater? We chatted noisily, some said to play first, and some said to play later. The teacher patted the podium and said, I think the chances of winning are very high, because you can grab 2 from the beginning by playing first, so you play first.
After listening to the teacher's explanation, I suddenly realized.
In fact, in our game, there will also be mathematics. As long as we pay attention to observation, there will be mathematics everywhere in our lives!