Composition on Mathematics (1)
Mathematics is not only in bookstores, but also in supermarkets. In the process of selling in the supermarket, there is also a profit between the cost and the price. The residual profit after deducting the rent, water and electricity charges from the employees' salaries, which is often called net profit. This is true not only in supermarkets, but also everywhere in life.
A few days ago, I went to the small store to buy groceries. By the way, I read the numbers of the three categories of the landlady. There are cost, sales price and discount. I asked about the price of goods around the cartoon. For example, if the cost of posters is about 15 yuan, then the price is about 16 yuan. There is no discount for such goods. The profit you get is 16 minus 15, which is only about one yuan. The landlady said that these things are very popular although they are less profitable. I also asked about a very cute cup, cat like. This is the same gift I want to give to Shiyu. The price of this cup is 18 yuan, about the same as that of the poster, but the cost is between 15 yuan and 14 yuan. Let's calculate the profit. If you subtract 15 or 14 from 18, the profit will be at least three yuan. The landlady said that this kind of cup is good for giving away, but it is not practical for self use. When this kind of gift cup is purchased, it is not as many as the poster, but the individual profit is quite a lot. Now, when you calculate, the profit of posters and cups is almost the same. Therefore, the landlady said that these two things have their own strengths, and she entered. The enthusiastic landlady also told me something. For example, selling cards. Point cards don't make money now, but people who buy them always buy more things in their shops. In this way, the landlady seems not to earn money, but she actually earns more.
Profit in mathematics is also ubiquitous in life. Knowledge in mathematics is ubiquitous in life.
Composition on Mathematics (2)
When I was in math class, I accidentally saw something moving under the slide shown by the teacher, but I couldn't see it clearly and vaguely. Take a closer look at it. The thing that flickered and closed seemed to be a sun. After a closer look, it turned out to be a flower.
Yeah! In fact, there are a lot of things in real life that we can't see clearly at a glance. Please look at them several times. Maybe you can see them clearly, clearly and thoroughly.
Galileo, a famous Italian physicist, was attracted by the chandelier on the roof when he participated in an activity at the University of Pisa. He felt that although the swing of the chandelier was getting smaller and smaller, the time of each swing seemed to be the same. So he kept staring at the chandelier, and measured the swing time of the chandelier by using the pulse beat rule. As a result, he finally discovered the isochronity principle of the pendulum. Galileo not only made this discovery, but also made a number of inventions and discoveries for mankind, making great contributions to the history of human development, but his inventions and discoveries are inseparable [please read more.
When you are thinking about a problem, please read it several times; When you want to know someone, please read it several times; When you fail, please look at the reasons for failure several times; When you are depressed and not interested, please see the world several times; When you have successfully shaped your dreams, please read more successful experiences; Please read all these things several times.
Learn to watch more times, that is, learn everything. Then you will be surprised to find that everything around you is worth watching more times.
Composition on Mathematics (3)
Today, I did my homework well, played the piano well, and wrote the words. What are you doing? I turned here and there, and finally found a book from the bookcase - "500 Math Stories for Pupils to Improve Their Academic Performance". I picked it up on the bed, looked at it with relish, and soon was immersed in the ocean of knowledge.
Suddenly, I turned to page 103 and found the Pythagorean Theorem. We have talked a lot about Pythagorean Theorem. But who first discovered Pythagorean theorem? We can proudly say: "We are Chinese!"
It turned out that Zhou Gongdan, a great statesman in the early Zhou Dynasty, and Shang Gao, a mathematician at that time, were together to discuss some problems about right triangles. Among them, the question of "hook three strands, four chords and five" is mentioned: before studying the rectangle, we need to know the nine nine mouth decision. It is envisaged to cut a rectangle along the diagonal, so that the length of the short right side (hook) is 3, the length of the long right side (strand) is 4, and the length of the oblique border trade chord) is 5, and use four semi rectangular tables like the above right triangle to enclose it to form a square plate, Subtract the area twenty-four of two rectangles formed by four right triangles with Pythagorean chords of 3, 4, and 5 from its total area forty-nine to get the area twenty-five of the square originally made. This method is called "product moment".
"Wow!" When I saw here, I couldn't help but cry, "This business high is so smart. It is worthy of being (smart) business high, hey hey."
I decided that I would learn from Shanggao and become the first person to eat crabs.
Composition on Mathematics (4)
Teacher Lu took us to play a little math game -- "30". The rule of the game is very simple, that is, who says "30" first. Each person can say at most three numbers at a time, or at least one number at a time. Play from 1 in order, and the person who says 30 wins.
This game looks simple, but it is different to play. We played with the teacher several times, but the teacher won. We were not convinced and wanted to compete again. The teacher agreed to our request. The teacher asked us, "Who thinks they can win? Raise your hand." As soon as the teacher's voice ended, the students raised their hands. After several rounds, the teacher won. The teacher asked us, "Do you find any rules?" I thought for a while and said, "As long as anyone first says 26, he will win." The teacher smiled and asked, "Is there something simpler?" Seeing that our class was silent, the teacher said, "If you want to win 26, you must win 22 first. If you want to get 22, you need to get 18 first, and so on, that's 261014182226. " The teacher also asked, "Do you think it is more likely to win the game first or win the game later?". The teacher patted the platform and said: "I think the chance of winning first is high, because you can get 2 at the beginning of playing first, so you play first."
After listening to the teacher's explanation, I suddenly realized.
In fact, there will also be mathematics in our games. As long as we pay attention, there will be mathematics everywhere in our life!
Composition on Mathematics (5)
At noon today, I felt that my mouth was boring, so I asked my mother to give me some money. Mother took out 15 yuan from her pocket. I took the money and ran excitedly to the supermarket.
When I got there, I took two packs of gum and a packet of biscuits. I was just going to pay, but I thought: I bought all dry food, so I should buy another bottle of drink. After thinking about it, I took another bottle of Coke. At the cash register, I gave the waitress aunt 15 yuan, and the aunt gave me 1.5 yuan. I also calculated secretly: 3 yuan for a pack of gum, 6 yuan for two packs, 4.5 yuan for a packet of biscuits, and 13.5 yuan for a bottle of coke. I gave my aunt 15 yuan, 15-13.5=1.5 yuan, 1.5=1.5 yuan. It does seem to be 1.5 yuan. After the calculation, I took the money and went home safely.
When I got home, I returned the remaining money to my mother first. When preparing to eat, my mother gave me a math question: a packet of biscuits is 4.5 yuan, and there are 12 pieces in total. How much is a piece of biscuit? I thought about it and finally worked it out. "It's 0.375 yuan," I said confidently. Mother picked up the computer, checked it, confirmed the answer, and gave a thumbs up.
In life, there are problems related to mathematics everywhere. As long as we verify and think, we can not only find satisfactory answers, but also a happy thing.
Composition on Mathematics (6)
I don't know why, since I was young, I have a special liking for mathematics. Is it heredity? Or for your own reasons? In a word, math and I are inseparable friends.
The Analects of Confucius said: "Those who know something are not as good as those who are good, and those who are good are not as good as those who are happy. Since the first grade of primary school, many mathematical problems have been solved in front of me; Sometimes it is inevitable that "Jinzhou" is the main idea.
I love studying math. When I was in the fifth grade of primary school, my teacher opened a math improvement class. How could I not participate? Once, except for a math problem, the teacher and I were all thinking hard, but we could not overcome it for a long time. I even came up with a piece of calculation. Finally, when the teacher was about to release the answer, I shouted - it was done! The students were surprised and asked me how to calculate it. After the teacher asked me to speak, the students also stole admiring eyes from me. Since then, I have become more interested in studying mathematics.
I still remember that in the fourth grade, the school had to choose representatives to participate in the Olympic Games. There were 30 people in our class who signed up for the preliminary contest, but only 3 students including me entered the semi-final, but they were finally squeezed out due to insufficient places. This shows that I still have room for progress.
Now, I still have a great interest in mathematics. Raise the sails of mathematics and move forward to dreams!
Composition on Mathematics (7)
Extraordinary event! Extraordinary event! You Li Ying, a municipal outstanding teacher, has come to our class! The intelligence officer gasped and said, as soon as the words ended, I was expressionless and thought to myself: It must be an outstanding municipal teacher coming to class, and the requirements must be very strict. The face of a joke with a classmate immediately turned into a zombie face.
In the afternoon, I came to the class, and the class was still quiet. Walking up the staircase classroom on the fourth floor, it seems that every step is closer to death; Every step seems to be grasped by the devil; Every step seems more difficult than climbing the ladder. I went to the lecture hall in a frightened way, as if another cold war had broken out.
The teacher came in quietly and slowly. He looked knowledgeable, dressed in a formal suit, and wore glasses on the bridge of his nose. The teacher told us that we had a code lesson today, and I was confused about what a code lesson is? It turns out that if you scan the code with your mobile phone, you will know the astronomy and geography. This is the first time for me to attend this class. The teacher gave us a lot of profound questions, but what impressed me was what the difference was between 3, 6, 8, 9 and 1, 2, 4, 5, 7. I pondered for a long time but still didn't think of it. To my surprise, the answer was that the previous row was curved and the next row was straight. I laughed my abs out. There is also a children's song that I can never forget, which turns zero into a poor, stupid, naughty person
After this class, my nervous mood was swept away by the teacher's humorous style. This class is not so much a math class as a math game class.
Composition on Mathematics (8)
Although Mr. Han is usually very kind, he still keeps his principles. He is strict with our study. When some students didn't study hard at the beginning, Miss Han gave them patient and careful education and tried to make them get rid of these bad habits. He often worked late into the night in order to explain his knowledge in more detail. The teacher's full enthusiasm and high sense of responsibility also deeply moved us, so we listened to each lesson very carefully. Interest is the best teacher. One by one dull mathematical symbols have now become a string of beating notes. Our class's math scores are also growing steadily. In the mid-term exam, our class's performance jumped to the top of the school.
Mr. Han not only teaches well, but also has many talents. Time flies, and it's New Year's Day. In order to activate the campus cultural atmosphere, the school held a New Year's Day party. The teacher not only acted as the host, but also performed a sketch with us. During this period, he also showed his voice and sang a song "Childhood" with his guitar. The sound was mellow and the singing was beautiful, which made everyone happy.
The students in other classes envy us for having such a good teacher. Teachers not only teach us knowledge, but also teach us how to be human. Although it is only a short year, your words like gentle breeze and gentle rain have cleaned up the dust and mud on our hearts; You exhort me like the mighty east wind, summoning up my courage to move forward. Teacher, we will study hard, because we also want to be a teacher like you.
Composition on Mathematics (9)
In life, many things around us are closely related to mathematics, such as shopping, calculating expenditure and income, etc., which are closely related to mathematics.
Mathematics is a very interesting subject. As long as you keep forging ahead, groping and experiencing in your study, and find the mystery here, you will enjoy the endless fun in the mathematical kingdom. For example, the most common problems in mathematics, such as finding rules, simple calculation and optimization problems, should not be underestimated. They are all indispensable in life, To take a simple example, in our daily life, we often encounter the problem of how to arrange reasonably to achieve the best effect with the least time. When solving such problems, we must use the mathematical overall planning idea, and try to do it simultaneously if possible.
I have encountered such extreme value problems. It takes my mother 20 minutes to cook, 10 minutes to wash and 10 minutes to stir fry. In order to save time, please calculate the minimum number of minutes? The optimization problem proves that washing and frying vegetables are carried out at the same time within 20 minutes of cooking. After 20 minutes, the rice is cooked and the dishes are fried. Therefore, the process and sequence of cooking, washing and frying vegetables can be reasonably arranged to complete cooking, washing and frying in the shortest time, which is the mathematical overall planning method.
There are many similar examples in life. Therefore, we must study this interesting lesson to lay a good foundation for better use of mathematics in the future.
Composition on Mathematics (10)
"How many turns does the clock turn a day?" Teacher Lin asked us.
Our answers are varied, including 50 words and 100 words. Like a riddle, more than a dozen students have been punished to stand. I have calculated, and I know, but I am also afraid of saying wrong. If I am wrong, I will also be punished to stand. Gao Wenzhao asked me, and I told her, but just then Miss Lin called me, "Tang Ruiqi, you say." I stood up without hesitation and blurted out, "24 laps."
Teacher Lin said, "By the way, take your seat."
But some students said, "Teacher Lin is wrong, not 24 laps."
Teacher Lin said: "Let's think about it. It takes one hour to walk around the clock, and 24 hours a day is 24 circles. Teacher Lin drew a picture while talking, and the students understood.
In fact, these things are very close to our life, so we can see it after careful consideration.
One day, the weather was particularly sunny, and I helped my mother do housework. We hung the curtains first, and I supported my mother for fear that she would fall. Then, we cleaned the glass again. My mother stood on the fork ladder, and I also went to help. Standing on the fork ladder, I helped my mother clean the glass. My mother said, "The fork ladder can't stand it, go down quickly!" I said, "I can stand it. You weigh sixty thousand grams, and I weigh forty-one kilograms, which adds up to one hundred and one kilograms. The load of the fork ladder is one hundred and fifty kilograms, and one hundred and one kilograms is less than one hundred and fifty kilograms, so I can go up." My mother said approvingly, "It seems that you are good at mathematics!" After listening to my mother's words, I felt like eating honey. I went on to clean the glass again, and soon it was clean and looked as if there was nothing. It makes people feel comfortable!
I must study math hard, because math is so useful!
Composition on Mathematics (11)
At the beginning of the new semester, our class also welcomed a new math teacher, Mr. Li Xuemin.
In the first math class of grade five, the bell rang twice, and a male teacher came in from the door of the classroom. He had thick black hair, a pair of neat eyebrows, and a pair of bright eyes inlaid under his eyebrows. He looks very energetic!
Teacher Li's teaching methods are different. Unlike other teachers, he made his students memorize by rote. Teacher Li is different. He first showed his classmates how to write, and then explained while doing it. Then, we will give some similar questions for us to understand and do. Finally, we will talk about some key points, let us learn them well, which will be very helpful for learning.
Teacher Li is not only a different teacher, but also a humorous teacher. I remember one time, a student in our class did not look at the problem carefully. The teacher patiently taught the students how to do it first. After teaching, Mr. Li helped his eyes and said meaningfully, "If you continue to develop like this, you will move towards pigs, eh?" The teacher smiled and said, "No classmates will say, 'Teacher, how did I become a pig?' This is a big step towards pigs!" After a while, the whole class laughed. After a while, laughter gradually ran out of my ears. Then I realized that Miss Li didn't mean to tell jokes to amuse us, but warned us not to fall twice in the same place. It seems that Mr. Li is not only a humorous teacher, but also a teacher who can attract and educate students with funny language.
The word "gardener" really means a teacher. With such a "gardener", under his training, "flowers" will bloom better.
Composition on Mathematics (12)
I had countless teachers teaching me from grade one to grade four, but I found that my math teacher in the first semester of grade four was the most special. In the first semester of the fourth grade, a new math teacher was transferred to our class. Having her class is like wandering in the ocean of knowledge and stories. My math teacher is short and fat. The most important thing is that the math teacher is very humorous and often makes us laugh in class. Therefore, we all like math teacher's class very much.
Once, a classmate in the class went to the blackboard to perform a math problem, and his last step was: 15-6=21. The whole class roared with laughter. Teacher Chen pointed to the number and said, "I really hope he is right." What? Teacher Chen even hopes that the wrong answer is right? We stopped laughing at once. At first, the two husbands were confused. Mr. Chen looked at our puzzled expression and continued: "If he is right, I will go to save money later, save 1000 and withdraw 600, and the bank will return 600 to me, which is great!"! Later, no one in our class made that mistake again.
Another time, the class bell rang, but Mr. Chen had not yet come to class. A naughty student saw that the teacher had not yet come to class, so he pretended to be a kitten in the classroom, which made our other students laugh. Then, a number of students came along: some dressed as dogs, some as calves, some as lambs, some as chickens... The classroom was bustling at once! At this time, the door suddenly opened, and the classroom immediately became silent. Mr. Chen smiled and asked us curiously: "Eh? I just walked into the zoo. Why did I suddenly become a classroom? It's strange." At this time, our classroom was full of laughter again
This is my teacher Chen, this is my humorous teacher Chen!
Composition on Mathematics (13)
This morning in math class, we had Unit 3, Volume B exam. The bell hasn't rung yet. The students are working hard, and I'm no exception. This test paper is relatively simple. I finished it in more than thirty minutes.
Other students also handed in their papers. Out of the classroom, my classmates and I discussed the exam just now. I asked Qiu how she did the judgment question first, and Qiu said, "Simple death: wrong, wrong, right." After listening, I thought she did a wrong question, and said, "Ha ha, you are wrong, it should be wrong, right, wrong.". Jin said, "You are all wrong. It should be right or wrong." The three of us argued bitterly. reach
In the afternoon, the teacher came into the classroom and handed out the examination papers. I think it is clear who is right and who is wrong this morning. Sure enough, the standard answer given by the teacher is wrong right wrong. I'm very happy. I got the second best result in the class in this exam. I was about to laugh at Qiu, who ranked fourth, when it occurred to me that Qiu, who ranked sixth in my exam class last time, did not laugh at me or show pride. Modesty makes people progress, while conceit makes people lag behind.
I should learn from Qiu and learn to use the strengths of others over my own weaknesses.
Composition on Mathematics (14)
My math teacher is a very unique person.
Look! He is the tall and thin teacher coming to us. Although he wears ordinary clothes, he is the most eye-catching person among teachers.
I have never seen a teacher with such a rich expression. He smiles with crooked lips and blinks from time to time. He will look at you with interest, making you feel close to him. Every time when he comes to class, he will quietly walk into the classroom, make a big jump for us who are noisy and unwilling to be quiet, and then pretend to be serious and say: "You are really enthusiastic about the discussion, haven't you said enough? I'll go first, and then you go on." In fact, he didn't mean to go, but we also slowly quieted down. Not because his words are working, but mainly because the unique charm of the teacher's lectures attracted us.
I remember that in the next semester of Grade 5, our original math teacher could not give us lessons because of illness. We are reluctant to part with our former math teacher. When we learned that the school would send a male math teacher to teach us lessons, we were all worried. Who knew that when we saw the new math teacher for the first time, his funny appearance infected us. I always think that he is not only a math teacher, but also a competent "speaker". When he started to give us lessons, he talked with confidence. It seemed that he could not finish what he said in his stomach for three days and three nights. He analyzed our study, sometimes painstakingly, sometimes cynically. But that is the main reason for us to learn math well.
We all remember his "relaxed and happy learning plan", as well as his "corn seedlings in the wasteland", and his original Chinese zodiac - wood. Strange to say, these things that hurt our self-esteem did not hurt us, but also added to the unique charm of math teachers.
In this way, we don't know what method we always use. Anyway, we have been together for a whole semester, and our math scores have risen straightly, from the last third in the town to the positive third. Of course, this result has become an important reason for us to respect our math teacher. I like my math teacher. May we get along more!
Composition on Mathematics (15)
On September 1, the new semester began and I entered a new school. There are new flowers and plants, new teachers, new students, new class - everything is new. I will spend three years of my junior high school life here.
In the first few days of this junior high school, I met many teachers: Mr. Li, Mr. Nie, Mr. Wang... The teacher who impressed me most here is our math teacher Nie.
On the first day of school, I learned that Mr. Nie was a male teacher. We used to be taught math by female teachers. So the students wondered whether the teacher would be very strict in class? Do you leave too much homework? Will you often "communicate" our school performance to parents
In the sound of students' guesses, Mr. Nie came into our vision: his eyes were always full of wise eyes. "Hello, I'm your new math teacher. First of all, I'd like to introduce myself. My name is Nie... I'm very happy to be your math teacher, and I hope to be your most intimate friend when I'm happy." We were surprised by Mr. Yang's special and brief opening remarks. In our eyes, the teacher is always serious, Always on top. The teacher is "very happy" to be our friend? I really wondered: "Can he really become our friend?" Not to mention that, just as Teacher Nie said, he not only became our friend soon, but also fascinated us with math lessons.
Conclusion: Mr. Nie's Mandarin is very standard. His voice is a rich baritone. He speaks in cadence, sometimes like a surging river; Sometimes it is like a trickle of water, with a hundred melodies. Listening to his lecture is a great enjoyment. In Mr. Nie's beautiful and slightly humorous explanation, we learned mathematics, magic squares, rational numbers... Even in the boring review class, we can solve problems in the laughing game.
Composition on Mathematics (16)
Mr. Xu is our math teacher. He is over 30 years old this year. He is very tall, about 180 meters. He is very elegant and handsome, like a handsome guy. He has a lovely son who plays with him every afternoon after work.
Mr. Xu taught us very carefully. Once, Mr. Xu told us a difficult math problem, and our whole class was baffled. Mr. Xu patiently explained it to us, and gave us another simple problem similar to this problem, which inspired us by drawing inferences from one instance. In this way, he talked about two whole classes before we understood. From this point, I can see that Mr. Xu asked us to be very dedicated and diligent.
Mr. Xu is very serious in his lectures. He doesn't like to be glib and joking. On one occasion, a student answered a question with a smile on his face, but his answer was wrong. Teacher Xu pulled him to the back and fined him. Mr. Xu likes smart and brainy students. Liu Qihang in our class is not very good at Chinese and other subjects, and he is also very naughty, but he has a very good math score. He is top notch. He likes to raise his hand and speak in math class, and he also answers correctly. He knows a lot of questions that we don't know, so Mr. Xu likes him very much, always praises him, and gives him many small gifts, which makes us envious.
Composition on Mathematics (17)
Dear parents
The expected summer vacation is coming soon. What homework do children do in the summer vacation? I propose: Let children do more creative and hands-on activities and practical homework, which not only improves children's hands-on ability, but also improves children's mathematical thinking. These creative homework will make children's summer vacation more colorful. Next, our teacher will offer some materials to you. Parents can observe and think with their children, believing that there will be more different mathematics in their children's eyes.
1. Big transformation of three-dimensional graphics
In the activity of "Love the Earth", the school displayed many children's works. There are sailboats made of cans, bunny beds made of shoe boxes, clocks and bicycles made of discarded CDs, hourglasses made of glass bottles, and some large-scale works such as castles and robots made of various paper boxes. Many of these works use three-dimensional figures in mathematics. Box, box of cube, cylinder, sphere, etc. If you take pictures of the process of children's production step by step, write a brief description. It is a "big transformation of three-dimensional graphics". Collect the waste at home and start!
2. Beautiful graphic painting.
The children learned rectangle, square, triangle, parallelogram, circle and other figures. You can use colored paper to cut some plane figures to form a beautiful picture. You can also find some plane graphics in your life to create a beautiful picture. Here is a math picture book called Aunt Haha Taking Magic Medicine. In this book, you can see the big bird shaped by round biscuits and semicircle biscuits, and the big sailboat shaped by triangle. After reading this book, children will surely have more creative graphic paintings.
3. A day of * *
This material is the simplest and can be used to record a child's day. Take out your camera, take pictures of the children's activities, and take pictures of the clock time at that time. A simple picture description becomes a beautiful brochure.
4. Where (or on which day) the air is freshest
This topic can lead children to study air quality. First, take your child to check what PM2 and PM5 are. When paying attention to the PM2 and PM5 pollution in the city where you live, you can take photos of the day and record the air index of the day. Record more days for comparison. If you travel, you can also check the PM2 and PM5 of the tourist destination, compare the air quality everywhere, and find out where the air is freshest. Record the child's words after comparison.
5. Addition and subtraction in life.
Now we have learned addition and subtraction within 100, and we will use addition and subtraction in many places in our life. Lead the child to observe addition and subtraction in life, and show the problems in the form of hand drawing or taking pictures. You will find that mathematics is used everywhere in life.
The materials provided here can be made selectively, or both if you like. Maybe children will have better ideas! After that, parents and children edit a booklet with pictures and texts. The first mathematical picture book published by the child himself is printed and bound at home or at a copy shop. It is in this unforgettable summer vacation to do math picture books with children. Hurry up and get ready.
Composition on Mathematics (18)
My name is Hong Runyi. I'm an 11 year old student in Grade 5 of Dapu Central Primary School. I like painting and handcraft. Now I love writing! President Zhu gives us some awards every week to read and study. I have benefited a lot from it. Twenty minutes of reading aloud every day has helped me accumulate a lot of vocabulary. Thank you for helping me develop good learning habits!
One day on Saturday, my sister called me and asked me if I had any questions. I could ask her. I told her honestly, and her mother smiled: "Wow! Your sister is really warm-hearted, and she must be willing to help others at school!" It goes without saying that every week, my sister calls her five sisters to check and study!
"Then did you think about how many times you would call each other if you had to get to the phone?" Mom asked. "Well, this... I didn't expect it. Let me figure it out! "So I picked up my pen and worked hard to figure it out. I thought that my sister would call five younger sisters first, and the second would call the other four... and so on. Thinking of this, I quickly drew a sketch, and the result was as follows: 5+4+3+2+1=15 times" Mom! mom! I calculated the result! “
When I told my mother the result, my mother shook her head and my father looked suspicious. "You six people, each of you called five times, which should be 5x6=30 times." I pondered for a while, and there was a bit of truth, but there was a bit of error. But what was wrong? I scratched my head and scratched my head, and pondered. My mother was deliberately testing me! In fact, my mother deliberately repeated the number of callers, and the correct answer should be 5+4+3+2+1=15 times.
They listened to me, and smiled, praising my intelligence.
Composition on Mathematics (19)
We had wonton for lunch today.
As I ate, it suddenly occurred to me that 'reasonable arrangement of time', which I had just learned, could also be said to be 'the problem of making tea'. I asked my mother, "Mom, how many minutes does each process of making wonton take? How many minutes does it take?" My mother replied, "It takes 21 minutes to choose dishes and wash dishes, 10 minutes to wrap wonton, 5 minutes to boil water, and 3 minutes to cook wonton. Why do you ask?" I smiled, and then said mysteriously, "I use it to complete the problem." Mom was stunned, and then asked: "What question?" "Reasonably arrange the time!" "Oh, how can you save time? How much time can you finish cooking wonton?" Mom asked. "I think it will take 18 minutes," I continued. "First, make wonton for 10 minutes, then boil water for 5 minutes. While boiling water, you can choose vegetables and wash dishes. Finally, cook wonton for 3 minutes, a total of 10+5+3=18 minutes." My mother gave a thumbs up to praise my great.
I am very happy and happy. I wanted to continue eating wonton, but my father said at this time, "I have another way, it only takes 16 minutes." I was confused, and looked at my father expectantly. My father then said, "First choose vegetables and wash vegetables for 3 minutes, then wrap wonton for 10 minutes, while boiling water, and finally cook wonton for 3 minutes, which is 16 minutes." I thought it was really right, So I said to my father, "That's great, my father. Alas, it seems that my father is still more powerful than my little fart boy!"
This thing let me know that mathematics comes from life. It seems that we should pay more attention and think more in life in order to learn mathematics well!
Composition on Mathematics (20)
Math Nightmare
One night I dreamed that my father and mother were captured by the evil magic card king, and only my brother and I could save them. It's not easy to save my father and mother. I need to go to the quick calculation volcano first, then to the 24 Grand Canyon, and finally to go through the Magic Card King's question and answer.
We went to the quick calculation volcano first, and the guard of the Great Demon King said: "Each question has only five seconds of reaction time. If the answer is not given within five seconds, then it will be thrown into the volcano." The quick calculation began, "The first question, 18 × 2+4, is equal to what?" I quickly said: "It is equal to 40." The second question: "35 × 2+130, is equal to what?" I said: "It is equal to 200." The last question is to test you carefully. "What is 28 × 5+10 × 0 equal to?" I said: "It is 10." Then I ran to the 24 Grand Canyon quickly. I thought that as long as I passed this test, I could go to save my parents with my brother.
The master of the Great Demon King said, "I will give you 15 seconds to calculate 24. The first question, 1.2.3.4, is how to get 24." I said, "1+2+3 is equal to 6, and 6 × 4 is equal to 24." The second question: 0.1.3.8 is 24. I said, "3 × 8 equals 24, 24 × 1 equals 24, and 24+0 equals 24." The third question, 4.4.8.0, calculates 24. I said, "4 × 4 equals 16, 16+8 equals 24, and 24+0 equals 24." Yeah! I saved my brother. Next, it's time to accept the test of the Great Demon King. When we arrived at the castle of the Great Demon King, the Great Demon King said: "I only have one question. If you answer correctly, I will release the person. If you are wrong, I will clean up with you." I said: "Come on!" Question: "There is a clock that strikes once at one o'clock, two at two o'clock, three at three o'clock... How many times does the minute hand strike once at six o'clock, one day and night? ”I said, "1+2+3+4+5+6+7+8...+24=290, 290+2=292." Yeah! I finally saved my father and mother.
