One Sunday morning, I sat in a chair doing my homework. The chair wobbled on it because of its age. After grandpa knew it, he nailed it obliquely on the legs of the chair and let me try again. I found that the chair didn't shake at all! I asked grandpa curiously. Grandpa said: "the chair surface, the ground and two legs on one side form a square." I nailed a piece of wood obliquely in the middle, so I divided it into two triangles. " The triangle is very stable. Try it if you don't believe me. "I began to nail a triangle and a square with a piece of wood with curiosity. No matter how hard I try, I can't pull the triangle, but I will be deformed when I pull the square lightly. I finally understand why grandpa nailed the batten horizontally. This is what I learned in class. The triangle is stable and not easy to deform. It seems that mathematics is everywhere in life.

So I began to look for triangles in my life. After careful observation, I found that there are many examples of triangular stability in life. There are triangles on the pot rack and camera bracket for cooking at home. The bicycle is very stable when parked, because the bicycle bracket, the ground and the tires form a triangle. . There are many, many! Because I am good at observing life, I made a positive and wonderful speech in math class, which was praised by my classmates and teachers.

One day, my mother bought me a new pair of shoes. I tried them carefully and tried to put them on. But I couldn't put it in, so I finally had to "ask for help" from my mother. Mom really has a way of putting the toe of her left foot and the heel of her right foot together and plunging into it. Seeing that I was puzzled, my mother said to me, "Look, the area occupied by these two shoes is two right triangles, and the bottom of the shoe box is a rectangle." I suddenly realized and nodded: two identical right triangles can be combined into a rectangle. Isn't this the combination of triangle figures that we just learned in math class? It used to be here.

Look, from these examples, I feel that there are many things closely related to mathematics in real life? As long as we are good at observing and paying attention to mathematics everywhere, it will bring wisdom and create wealth. It can be said that there is mathematics everywhere in life, and it is inseparable from mathematics everywhere in life.

2. Mathematical composition 800 words Many students complain that mathematics is difficult to learn, and teachers always listen to monks-they can't touch them.

I think there is a way to learn math. As long as you master this policy of the Party and apply it, I believe that mathematics will become your friend. The most important thing in learning mathematics is to be good at thinking.

If you compare mathematics to a lock, then thinking is a golden key to open the lock of mathematics for you. For example, some students listen carefully in class and can swallow all the contents of the teacher's speech, but they don't digest or absorb it, and eventually they are "malnourished".

Mastered because he didn't develop a good thinking result, he couldn't reprocess what the teacher taught, he couldn't sort it out, and he didn't know the ins and outs of the road. Of course, he can't grasp the true face of knowledge. We should learn the working methods of bees. Bees can not only collect honey, but also make honey.

In this respect, some students do better. They not only listen attentively in class, but also think about the reason of such a solution when the teacher talks about the solution of a certain problem, although the solution of this kind of problem will be introduced later. In this way, the teacher is integrated.

While studying mathematics, we should pay attention to cultivating our good thinking habits, learn to use them flexibly, and draw inferences from others to get twice the result with half the effort. Some people say, "Mathematics is profound and unpredictable, which makes people puzzled and unpredictable." .

But in my eyes, mathematics is at most a set of knotted ropes. You must untie one knot after another patiently, and one day you can untie all the knots. Mathematics is the use of learned knowledge to solve unknown problems.

Learning mathematics requires perseverance, patience and perseverance. Just like a person who digs a well, he digs deep and gives up when he is close to the water source; All the previous work will be in vain and fall short.

It is also important to be careful when solving math problems. As long as there is a little negligence in calculation, the whole problem may go wrong.

Just like playing chess, you may lose everything if you make a wrong move. Don't wait until you have done something wrong to regret it. No regret medicine in the world comes from one action.

Bacon once said: "When you see Wang Yang, you think that people who have no mainland are just poor explorers", and "poor explorers" are doomed to fail, and the fundamental reason for their failure is that they have no spirit of exploration. Scientific invention needs exploration spirit, and mathematics also needs exploration spirit.

Don't always think that there is only one solution to every problem, "All roads lead to Rome", but try to explore, think and discover. Self-confidence is also the key to learning mathematics.

Don't always think that what the teacher says in the textbook must be right. You should have your own opinions and don't listen to other people's suggestions. Everyone should have confidence in themselves. One can't be successful forever. In the face of failure, a person should have confidence in himself and believe that he can do it.

As Goldsmith said, "The greatest glory in life lies not in never failing, but in rising again and again." .

3. Mathematics 200-word essay Part I: There is mathematics everywhere in mathematics life.

For example: buy food! Buy stationery! Measuring cloth, etc. , all need to use mathematics. This semester, the teacher taught a new knowledge, that is, the multiplication and division of decimals.

This knowledge helps me a lot! Last night, my mother went to buy oranges together. A kilo of oranges 1.8 yuan. My mother bought 4.5 kg and should pay 8. 1 yuan.

But the clerk was careless and didn't know how to calculate it, so it became 9 yuan money. Fortunately, this semester, I used the knowledge of Protestantism, and after doing a calculation in my mind, I immediately corrected the salesman's mistake.

Not only did my aunt, the shop assistant, praise me for my cleverness and my ability to multiply and divide decimals in such a small city, but my mother also praised me for saving her 0.9 yuan on the way home, and the knowledge I learned can be applied in my life. Yes! If you don't learn this math well, it's not only 0.9 yuan that will lose, but also hundreds, thousands or even hundreds of millions! Chapter 2: About Mathematics When you swim in the stormy waves of mathematics, can you ride the wind and waves? When you are struggling in the hard and painful real life, can you still love mathematics? When you are full of doubts about extremely simple questions, can you ask why? When you recite a difficult mathematical concept by heart, can you show it in your life? When you have questions about famous math papers, can you boldly question them? Mathematics, it is unfathomable, it is wonderful.

If you don't understand, it will bother you; But once you fall into the bottomless pit of mathematics, you will be deeply attracted by its wonders. When a difficult problem is solved through your hard thinking, you will feel a sense of accomplishment and a wonderful feeling of being in heaven.

Talking about the past and present, how many clever geniuses and buried talents mathematics has achieved: "Father of Mathematics"-Cyrus, "Prince of Mathematics"-Gauss, "Problem Seed"-Euler ... What great mathematicians they are. However, are their math careers smooth sailing? No, they all went through countless storms to see the beautiful rainbow! Hua, a self-taught mathematician, still loves mathematics and his pursuit when his left leg is paralyzed and his life is hopeless, and bravely questions the paper of the famous professor Su Jiaju. Without this, Hua would not be a great mathematician, let alone the pride of China. The greatness of Cyrus, the father of mathematics, is that he can not only explain the problem, but also add a scientific question mark. He is not superstitious and loves science. At the age of eight, the clever Gauss knew how to use the method of 1+2+3+ ... The ancient Greeks and China used to calculate the number of N 1+2+3...+ 100. Why could he use this method to calculate? Because he is willing to think and loves to think. Although Euler was a famous mathematician, he was not liked by his teachers at all when he was a child. He was a student expelled from school because he asked a question: How many stars are there in the sky? You know, it is impolite for God to ask such a question, and in Euler's time, God was sacred and inviolable, so he was fired.

But it is precisely because of his good habit of asking questions that he became the youngest college student in accel University. A person, as long as he has the noble qualities of loving brains, mathematics and science.

He can boldly question, embody mathematics in his life, actively ask why, never flinch when encountering problems and never give up, then he has taken the first step to become a great mathematician in the future! And I, as the future flower of the motherland and the hope of the nation, it is my bounden duty to learn math well, for the rise of China, for the bright future of China, and for myself! The ocean of mathematics, I am swimming, I want to raise the sail of my dream and ride the wind and waves in the ocean! Chapter 3: I am a lively and cheerful math boy. I like abstruse mathematics. Mathematics has an attraction for me. As long as I see a math problem, I will concentrate on it without making a sound, as if I have come to this profound math kingdom.

Some students say that mathematics is profound. I think it's because there are olympiad numbers in mathematics. Indeed, if you don't know anything about the Olympiad, you will be confused and think that mathematics is not fun at all; Of course, if you are interested in olympiad, you will have a belief that you must do it well and finish it in the process of calculation.

That's how I overcame one Olympic math problem after another, and I got a sense of intimacy in mathematics. I still remember that I participated in the Olympic Mathematical Contest in Grade One and Grade Two.

In the competition, in the face of those Olympic math problems that I didn't do, although I was sweating, I still devoted myself to them as always. With my efforts, I won the third place every time, and my heart was as sweet as honey. But I still hope that one day I can win the first place in the competition.

I can't live without the Olympics. It is like my partner, and I will be in close contact with it for a period of time every day. Up to now, I have done all kinds of Olympic math problems, my ideas are getting wider and wider, and my interest in mathematics is getting stronger and stronger.

I want to be a mathematician when I grow up. This is me-a boy who loves mathematics deeply.

Chapter four: After studying mathematics for more than six years, the road to learning is bumpy and full of difficulties. I remember when I was in the third and fourth grades of primary school, my math score was not good, and it kept fluctuating around 80 points. Maybe I was afraid that math would have resistance to this subject.

When I was in the sixth grade, faced with a severe graduation exam, I had to bite the bullet and study math seriously. Only then did I realize that mathematics was not as terrible as I thought.

I just found out that mathematics is actually the most interesting subject of all. After entering middle school, I really discovered the magic of mathematics.

It can bring us endless fun. Elementary school mathematics has learned a lot of knowledge: algebra, rational numbers, algebraic expressions, one-dimensional linear equations, binary linear equations ... In the process of learning, it is inevitable to encounter some setbacks, and there are countless regrets caused by carelessness.

Those naughty little guys

4. Math composition 400 words Today, because my parents are at work, my mother sent me to Xinhua Bookstore, which was crowded with people. As soon as I entered the door, a hot air came to my face. This lively scene made me suddenly impulsive. The bookshelves are crowded with people. If you want to see clearly, you have to squeeze in. I used to be so "civilized" that I forgot any courtesy. I exploited every loophole. I completely ignored the pressure from behind and chose books at will. After a while, I finally chose the book I read. Squeezing out of the crowd, I found one who looked like a teacher holding a lot of books. I asked the teacher politely, do you need any help? The teacher readily agreed. Teacher, are you choosing books for your students? Yes! How many students are there in your class? The teacher didn't tell me directly, but asked me, let me guess. There are 6 copies per person, leaving 4 1 copy, and 8 copies per person are short of 29 copies. How many students are there? How many books? This time, I was stumped. I thought about it and suddenly had an idea. The two points are different, resulting in a difference of 4 1+29=70 (books). Everyone divides six books into eight, and the difference is 8-6 = 2 (books). Oh! Suddenly, I understood that the total difference is known, and the difference between everyone is also known. Isn't that the total number? I quickly found out that there were 35 students, and when the number of students was found out, the books were easier to find. 6*35+4 1=25 1 (Ben) I told my teacher the answer, and the teacher said, "You are great! Exactly! "

In fact, mathematics is quite interesting, especially when you get the correct answer through hard work. The beauty in your heart is really unspeakable! In the future, I will explore and discover in the castle of mathematics and constantly experience the happiness brought by success.

5. Math Composition 200 Words Math Composition-Shopping

Today, "children" have the final say. I took the money my father gave me to buy food.

I came to the vegetable market and wanted to buy food. The food in the market 1.5 yuan, ready to buy 2 kg. But I looked at the food outside the market, which is 1.2 yuan, which is more delicious than the food inside. I was going to buy another catty and fry it at night, which not only bought more vegetables, but also became cheaper and cheaper. 1.5 *.

Then, I go to buy meat. The meat on the market is lean meat, 4.5 yuan is a catty; As for the meat outside the market, the lean meat is one kilo less than that of 4.5 yuan. In contrast, I certainly choose the meat in the market. So I bought 3 Jin of meat and spent 4.5 * * 3 = 13.5 yuan.

I was deeply impressed by buying vegetables this time.

6. Three Math Compositions My Discoveries Students, have you made some casual discoveries in math study like me? Now I will introduce some of my findings.

If you want to calculate a multi-digit multiplied by 5, do you want to calculate it vertically? But I can do it with my mouth, because I found a little trick. Do you want to know? Let me tell you: calculate the product of 48532*5, first find this number 485320, and then divide it by 2. Can I take it orally? 242660 This is the product of 48532*5.

Do you know why? I first expanded the original number by 10 times, and then reduced it by 2 times. Is it equivalent to expanding five times? Have you mastered this little trick? I also found the same thing: multiplying a number by 1.5 only needs to add half to itself. (think about why? How about a number multiplied by 15? Use the method just now to add one more step-you have already thought of it, and then expand it by 10 times! I also found a multi-digit, and the last two digits meet this requirement: ten digits are odd and one digit is 5. Multiplied by 5, the last two digits of the product must be 75.

I think why is this? Because the unit of multiple digits is multiplied by 5 to get 25, the unit of product is 5, which is the tenth power of 2, and the odd number of ten is multiplied by 5 to get 15. This 5 must be added with the 5 to be written on the ten, so the product must be the tenth power of 7 and the tenth power of 5. In the same way, it is not difficult for you to deduce that a multi-digit number is even in ten digits and 5 in one digit. It is multiplied by 5, and the last two digits of the product must be 25.

Can this discovery be explained by an ingenious algorithm of multiplying numbers by 5 that I mentioned earlier? Think about it, they are the same, because after this number is expanded by 10 times, the last two digits are 50, and then divided by 2, there may be a remainder of 1 in the hundreds, and when combined with 50, 150÷2=75 is the last two digits, or there may be no/kloc-0 in the hundreds. Students, is my little discovery insignificant? But I am very proud, this is the result of my own observation and thinking.

Aren't great discoveries made up of these bits and pieces? Students, let's be a diligent thinker and discoverer! Talking about the understanding of zero seems monotonous, but it is not. In fact, it is very rich and hides a lot. Zero is special in mathematics. No matter what you do, you should consider zero.

"0" is often used as a symbol in geometry. The uniqueness of "0" comes from some concepts or problems. For example, every rational number has a reciprocal, while "0" does not. Rational numbers are divided into positive numbers and negative numbers.

"0", a number is divided into one category, isn't this special? In divisor, only zero cannot be divided. Zero is the dividend. No matter what number you divide (except "0"), you will get zero.

We often ignore zero, but it plays an important role. Like what's the problem? Some people can't think of "0".

When counting, some people will forget zero. For example, how many integers are there that are not greater than 5 and not less than -5? Someone will have eight.

Actually, there are still 0. For example, which numbers are not bigger in absolute value than themselves? That's positive numbers and zeros (also called non-negative numbers).

Zero is more colorful in life. At the parent-teacher conference after the semester, when the teacher showed the wrong textbook to parents, we all hoped that our boxes would be marked with "0", indicating that we had not made any mistakes, and our parents were happy and we were happy.

But we don't want to see this number or an integer close to this number on paper, otherwise the day of going home will be sad. Nobody wants to get "0" in the competition.

Zero is money. I think zero is a trap in the problem, and everyone should consider zero when doing problems in the future.

Zero can also change people's mood on different occasions. It's wonderful and rich.

The understanding of 0 0 is a wonderful number, and it is also an "old friend" that middle school students often meet. Calculations and concepts must be satisfied. First of all, 0 means nothing, which can be called "desert" in numbers. 0 is also a strange number. In all units such as volume, area, weight, speed and distance, it doesn't mean time, a person's age, the starting point and the starting point of a game.

Among the natural numbers in the digital library of the mathematical kingdom, the number 0 is definitely the smallest. Without 0, there is no natural number, because 0 is the starting point of natural number.

In calculation, when 0 is multiplied by any number, including negative number, fraction and zero, the absolute value of 0 is also equal to 0. Among rational numbers, its absolute value is the smallest. When 0 is divided by any number, 0 plus a number still gets that number, for example: 0+ 1 = 1, 0+ 1. Subtract a number from 0 to get its reciprocal, for example: 0- 1=- 1, 0-87=-87.

On the number axis, 0 is the origin and boundary line. Why does 0 wonderfully separate positive numbers from negative numbers? Because 0 is neither positive nor negative, it is just an integer. When 0 and positive numbers are together, it is called non-negative, and when negative numbers are together, it is called non-positive. On the number axis, 0 provides great convenience for us to judge the size of positive and negative numbers. The right side is positive, the left side is negative, the number on the right side is always greater than the left side, which means that the positive number is greater than the negative number, and 0 is greater than the negative number, but less than the positive number. In geometry, an angle of 0 degrees means a ray, which has no angle and no degree. 0 square meters means no area, and 0 meters long means no height.

A weight of 0 kg means no mass, and a weight of 0 m3 means no volume. In topography, 0 means sea level, above 0 means above sea level, below 0 means below sea level. Xinjiang in China has a basin with an altitude of155m, and Tibet in China has Mount Everest with an altitude of 8848m.

At noon today, in order to measure the size of chopsticks more accurately, I asked my father to take a slender measuring cylinder from the chemistry room. The scale unit is smaller, and each unit is only 1 cubic centimeter. At this point, I seem to feel victory beckoning to me. I really have everything except hands-on experiments.

First of all, I drew a dividing line on disposable chopsticks with a pencil, divided the chopsticks into two sections evenly, and soaked them in water to avoid washing them when measuring. Then, insert the chopsticks into the measuring cylinder, drop water into the measuring cylinder with a dropper, let the water in the measuring cylinder rise to the dividing line of the chopsticks, take the chopsticks out of the measuring cylinder after recording the water level scale (38 ml), and then record the water level scale (34.5 ml) in the measuring cylinder. The difference between the two water level gauges is the volume of this part of chopsticks, which is 3.5 cubic centimeters.