Buy medicine
Five (4) Ban Gu 'awu
On Sunday morning, my grandfather and I went to the pharmacy in Outang and bought two boxes of tablets-Weiershu.
Two boxes of medicine, a ***44 yuan and a box of 22 yuan. Grandpa paid her a 50 yuan, and the clerk gave it to Grandpa 6 yuan.
After I found the change, I calculated it with decimal addition and subtraction. Grandpa can also pay like this: 1. Give it to 40 yuan, the shop assistant, and then pay 5 yuan. The asking price is 1 yuan. 2. If Grandpa has change, he can pay 40 yuan first and then 4 yuan.
By buying medicine with grandpa this time, I know that mathematics is closely related to our lives.
Supermarket shopping
Class 5 (4) Gu Yuting
On Sunday, my sister and I went shopping in the supermarket. I bought a pack of beef jerky, a bottle of milk and a bottle of soda. 10 yuan. Zhao Lin bought a box of biscuits, a bottle of soda and a piece of 9 yuan money.
We gave the shopkeeper 20 yuan money. The shopkeeper gave us 2 yuan money. When we were ready to go home, Zhao Lin said, "I still want to buy 10 bubble gum." I took out the money and found that the shopkeeper gave me 1 yuan. Let's go back and return the extra 1 yuan to him. The shopkeeper praised us as an honest boy, and our hearts were filled with joy.
65438+ February 65438+Thursday 06 sunny
Wang Yixuan, Class 5 (2)
Yesterday, I got 95 points in math. I made a mistake in filling in the blanks and writing questions. The teacher reviewed the fill-in-the-blank questions for us before the exam. I didn't recite it carefully, but I remembered it carefully. I was thinking about something else when I recited it, and I didn't remember it at all. So when I took the exam, I couldn't remember it anyway, so I wrote a "number size" casually. I didn't see the meaning of the title clearly, and it was wrong to write "X" as "⊙". This grade, the first 1 question is because my attitude is not correct, and the second question is because I didn't review it carefully. I will definitely do these two things in the future, but I can't be careless.
Teacher, I can't get satisfactory results in every exam. Since I took interesting math, I understand that the most important thing in learning math is understanding. It's no use just copying other people's answers. It's no use copying them. So I will listen carefully in the future and strive for excellent results.
It was sunny on Friday, June 65438+February 65438+July 2004.
Yi Feng of Class Five (5)
Recently, our students from grade three to grade six took a math test. I only got 92.5 points in this exam. Carelessness made me do a lot. You're right. It's not that I can't. It was careless. There are often some size problems. Without these problems, I would be better. There is a saying: "The first mistake may be excusable, but the second mistake shows that you are a' fool'." Maybe I am this "idiot". My grades are like an olive. Olives hang from the cliff. If you are not careful, you will "bump into …" and fall down. Achievement depends not on thinking high, but on hard work. An ideal without action is a fantasy. As Nietzsche said, the value of a thing sometimes depends not on people's income, but on people's efforts-on how much you have paid for it. This sentence is correct. Wisdom does not lie in profound knowledge. We can't know everything. Wisdom lies not in knowing as much as possible, but in knowing what we need most and what we don't need to know.
Through this exam, I not only tested what I have learned recently, but also exposed many shortcomings of myself, so that I can correct them in time in my future study.
It was sunny on Friday, June 65438+February 65438+July 2004.
Class 5 (4) Ginger
After this test of curly hair, I found that my carelessness was not committed, but not so serious. The seventh question of the fill-in-the-blank question is a special part of the book, which is all my mistakes that I didn't read carefully; There is another question in the third part of the third question that is wrong because you don't look at the problem carefully and think it can't be worked out easily; I shouldn't make mistakes in thinking training. I should know all those questions. Just because of the wrong idea in my mind, I think this question is too simple, so I chose the wrong one. Not only did I make mistakes in exams, but I also had many jealousy problems in my daily life. For example, when I am writing, I often make careless mistakes and make mistakes. Later, I checked and found that I often do my homework and play for a while, and I am most likely to be careless, half-hearted and make mistakes. But now that I've got rid of my half-hearted problem, I believe I'll be better after I get rid of other problems.
Saturday, February 2004 18
Zhou Zhen, Class 5 (1)
We had a monthly exam the other day. I was very nervous after I finished my math exam, and I was worried that I would not do well in the exam!
The results came out yesterday, and I can't wait to know my own results. At 95 minutes, I finally breathed a sigh of relief. I finally put down a heavy stone. After the papers were handed out, I carefully analyzed the reasons for the mistakes as before. I sighed deeply and said, "Ah, I shouldn't be wrong in the two questions, and I believe that I can get a 100 score." However, I am so careless, as if I were going to make a few mistakes! I think: I must remember this lesson and let it remind me at all times that I will not be so careless in the next exam, and I must get the best "100"!
From this math monthly exam, I understand that no matter what I do, I must believe in myself and be a confident and good student.
Saturday, February 6, 2004, cloudy
Class 5 (3) Chen Minyu
Today is Friday, and the test paper has been handed out. When I saw the results, I couldn't believe my eyes. I was only 86 points worse than last time. I am really ashamed and envious to see that others got a score of 100. I wish I could get a score of 100. But I blame myself for being careless, and I also blame myself for suddenly having a stomachache before I finished checking the first half of the test paper. I really don't know what happened. And I clearly found a problem wrong, but I didn't have time to correct it. The question is 4 points. If I add up the scores of this question, I can get 90 points. This exam taught me a lesson: don't eat anything except dinner before the exam. And the check is to write quickly and carefully, don't write typos, or the right one will become wrong, and count it several times. Write the answer quickly and not carelessly, because there is still time to check later.
I will work harder this month, because I will face a final exam instead of a quiz. I will definitely work hard and try my best to get better results in the exam.
Thursday, October 25th, 2004/KLOC-0 +065438.
Five (3) class Cao
Today, the teacher asked us to verify the constant law of quotient in division with a calculator. Let me give some examples, such as:
Example 1: 16 ÷ 2 = 8 cases 2: 6 ÷ 2 = 3 cases 3: 1200 ÷ 200 = 6.
160÷20=8 60÷20=3 120÷20=6
1600÷200=8 600÷200=3 12÷2=6
…… …… 1.2÷0.2=6
……
There are many such examples, so I won't write them out one by one. From the above example, I know that in division, the dividend and divisor are expanded (or reduced) by the same multiple at the same time, and the quotient remains unchanged.
follow one's gut feelings
Fu Liangliang in Class Five (5)
I studied mathematics and learned a lot. Because I have a new view on mathematics. I always feel that studying is as exciting as playing in an amusement park. I don't know what it feels like. It seems that there is always someone pushing me to find the mystery of learning. I sometimes have an idea telling me not to study. But there is another thought that is more powerful than this, and I should study hard. So I'm studying hard. The teachers who were disappointed in me now have a new view of me. It can be said, "That Fu has changed, and he is not as lazy as before." I know that not everyone is born stupid, but refuses to study hard. And those who love learning and have a sense of honor will study hard. Everyone has different advantages, just like Feng Qi in our class. Although he is lazy, he is very interesting. This idea reminds me of the sentence "I was born useful", which makes me feel that only those who are diligent and eager to learn will succeed. Those students who are lazy will only get a temporary pleasure, and then they will not be happy in the end. Only diligent people can laugh at everything.
A math problem
Yu Junjie, Class 5 (1)
Today, I was stumped by another math problem. The topic is like this: "The tiger heard talking about bullets outside the enemy window: one person said that everyone would return 45 bullets and get 260 bullets. Another person said, everyone carries 50 yuan, and 200 extra rounds. How many enemies are there? How many bullets? "
I thought hard and kept drawing on the draft, but I had no clue. Grandpa came up to me and said, "This is profit and loss problem. There is no trick, just (260-200)÷(50-45).
A math problem
V (1) Ni Yangfan
Today, I was stumped by a math problem. The question is this: "There are two bookcases in the school reading room. There are three times as many books in cabinet A as in cabinet B. Book lending in cabinet A 170, and book lending in cabinet B 10. At this time, the books left in the two cabinets are just equal. How many books are there in each cupboard? " After reading the question, I scratched my head and chin, but I couldn't think of a solution to the problem. Suddenly, my brother came. After reading the topic, he said, "This is a problem of difference times, mainly to find the difference times." After listening to it, I suddenly realized that I had listed the formulas at once.
165438+1October Sunday 14
Class 5 (4) Xu Shiming
Today, my mother and I took 62 yuan to buy salad oil. On entering the supermarket, we saw salad oil. My mother took two barrels to pay. I quickly said to my mother, "No, the unit price of this barrel of salad oil is 32." 5 yuan, in other words, the total price is 32.5×2=65 yuan, so we don't have enough money. "Mom said happily," It's good to have you, or I'll have a problem. "
Mathematics in life
Class 6 (3) Xu Dong
I am relieved that all the exams have been finished today. I sat in my seat and did nothing. I came across a book called Mathematical Genius in my desk by accident. Just as people in the desert have found a way out, I am in high spirits. When I opened it, it was a portrait of Hua, and I found the "mathematical genius puzzle case" according to the catalogue. I thought: Hua is not a detective. How can he solve the case? I read this article with questions. After reading it, I realized that the most important thing for Hua to solve this mystery is that he is good at mathematics and can calculate according to the numbers and symbols in mathematics. My wish is to be a detective like Sherlock Holmes. However, being a detective, like Hua, has a wealth of mathematical knowledge. Now, only by learning math well can I realize my wish.
It will be fine on Friday, June 0
V (2) Wang Yixuan
After the exam, I got 97 points. The highest math score in the class is 98.5. For the class, this score is high, but for me, this paper should be 100. If my "solution" is written, I can get 98 points. The last one is not that I can't do it, but that I am missing a number. I passed 100.
Teacher, your comment last week was "Work hard!" . Teacher, you know, it is these two words that have added infinite strength to me and made me get a good score of 97 points. Here, I sincerely say "thank you!" " .
September 16 Saturday is cloudy and rainy.
Dongwuban (5)
This morning, my mother took me to the supermarket in Fallen. When I arrived at the store, I didn't know what to buy because of the dazzling array of goods. First, we came to the gourmet area. I chose Shanghaojia natural potato chips and Mengniu dried milk tablets, and my mother chose a bottle of vitamin chewable tablets for growth and happiness. Then we went to the electrical area and bought a Runxin repeater. Finally, we went to the daily necessities section and bought a San Xiao toothbrush. It was then that my mother remembered that she had only one hundred dollars with her, and I didn't know if it was enough. I looked at all the commodity prices: Shanghaojia natural potato chips 4.8 yuan, Mengniu fresh milk dried tablets 13 yuan, San Xiao toothbrush 3.5 yuan, growth-happy vitamin chewable tablets 29.9 yuan, Runxin repeater 62 yuan. Then I estimated that it would be 1 13 yuan. I quickly told my mother that there was not enough money. We'll put the Happy Growth Vitamin Chewable Tablets back. Fortunately, I learned to calculate this time, otherwise I would make a fool of myself!
The smallest egg in the world
Class 5 (3) Ginger
65438+1February 2 1 Thursday sunny
A few days ago in math class, the teacher gave us an application problem, saying that the largest bird egg in the world is ostrich egg, and its egg has 1300 grams. How much does the smallest egg weigh? I put a question mark in my mind. After surfing the Internet and reading books in various ways, I finally found the answer in the China Youth Encyclopedia: the smallest egg is a hummingbird egg, and the hummingbird mother lays 2~ 1 egg at a time, which is only the size of a bean, each weighing 0.5g About 200 hummingbird eggs are the size of an egg. Hummingbirds can fly out of the nest for food and start an independent outdoor life after living for about 20 days.
What interesting knowledge, it can not only learn, but also increase extracurricular knowledge. It really kills two birds with one stone.
My revised edition
Class 5 (2) Ding Yiling
I often get 100 in math exams. Other students asked me if I had any tricks. I told them that I had a "correction book", which helped me a lot.
In the past, when handing out exercise books or test papers, I only looked at the grades or scores given by the teachers, and never considered what was wrong, why it was wrong, and how to correct it. As a result, every time I make a mistake here or there, I can't get full marks. Once, my math teacher said to me, "We should really learn knowledge when we learn knowledge, and we can't just look at grades and scores. If the question is wrong, carefully analyze the cause of the mistake. I suggest that each of you prepare a correction book, copy down the types of wrong questions, find out the reasons for the mistakes, and seriously correct them. " From then on, I prepared a small notebook, only the size of the palm of my hand, and wrote three words on it, "Correct the wrong book".
Whenever exercise books and test papers are handed out, I always analyze them carefully, copy the wrong questions on the "correction book", carefully analyze the reasons for the mistakes, mark the mistakes with a red pen and correct them carefully. For example, when I was learning to solve equations, it was recorded in my "error correction book".
title
Error cause analysis
Ding Zheng
x- 16= 18
= 18+ 16
=34
This is a writing format error, which is affected by the offline calculation format. Every step of solving the equation is necessary, and the equal signs should be aligned.
x- 16= 18
x= 18+ 16
x=34
16x=4
x=4
Here, x is a factor, and the product (4) should be divided by another factor (16). Due to carelessness, I think 4 can be divided equally.
16x=4
x=4÷ 16
x=0.25
23-2x=3
2x=23+3
2x=26
x= 13
The following is the subtraction of the known difference and the minuend. The difference should be subtracted from the minuend, and the difference added by the minuend in this problem is not equal to subtraction.
23-2x=3
2x=23-3
2x=20
x= 10
When I am free, I always take out my beloved "correcting book", check it carefully and keep my homework in mind. This is the secret that I often get 100 points.
Uncover the mystery of the tea cone
Recently, we are learning three-dimensional graphics. This caused me to think about the problem that most tea cones are cylindrical. Why? Is it polite or beautiful to make the tea cone cylindrical? Or ... no, no. I don't understand! Wondering, I made up my mind to solve this mystery.
Today, there came an uncle at home who I admired since I was a child. His name is Zhuge Liang. I picked up the tea cone and prepared to make tea for him. Suddenly I had a brainwave and asked him, Uncle, do you know why most tea cones are cylindrical? My uncle asked me, "Tell me first, why?" ? I don't want my uncle to look down on me. I really want to find the right answer with what I have learned.
As time went by, I was sweating with anxiety, but I couldn't find the answer. At this time, my uncle patted me on the shoulder and said to me, you might as well start with a figure with the same circumference and a larger circular area, and then consider it. After listening to my uncle's words, it suddenly dawned on me that using a cylindrical tea tube can not only hold more tea leaves, but also save materials. Knowing this, I combined real life and painting to prove my idea.
I told my uncle this idea, and my uncle gently stroked my head and said, "You are good at finding math problems from real life and trying to solve them." I believe you will be the future' Zhuge Liang'.
Life is inseparable from mathematics.
I used to think that learning to find the least common multiple was boring. It's really annoying to deal with the problem of finding the least common multiple of 1 1 and 12 all day. I have always felt that it is useless to learn this knowledge in my life. However, one thing changed my view.
That was not long ago. Grandpa and I went to the Youth Palace by bus. My father and I took the No.3 bus and were about to leave when the 1 bus just took us away. At this moment, grandpa looked at two cars and suddenly smiled and said to me, Xiao Ying, grandpa has a question for you, okay? I am confident to answer: good! Then listen carefully, if the 1 bus runs every 3 minutes and the No.3 bus runs every 5 minutes. How many minutes will it take for these two cars to start at the same time? After a pause, I said, Grandpa, you can't solve this problem. Grandpa looked at me doubtfully: Oh, really? There is still one condition missing in this problem: 1 bus and bus No.3 start at the same place. After listening to my words, grandpa suddenly patted his clever bald head and said with a smile: I, a' doctor of mathematics', sometimes get confused. My questions are not rigorous enough, but I will still think seriously. Grandpa and I laughed happily. Then grandpa said, well, now suppose it's the same starting point. What method do you use to answer? I thought about it and blurted out: 15 minutes again. Because 3 and 5 are prime numbers, finding the least common multiple of prime numbers is equal to the product of these two numbers (3х5= 15), so 15 is their least common multiple. In other words, two cars can leave at the same time in at least 15 minutes. Grandpa praised me: correct answer! 100 integral. Yeah! After listening to grandpa's words, I raised my hands happily.
From this incident, I understand a truth: mathematical knowledge is really everywhere in real life.
How long is this straight line?
Tonight, my cousin and I are playing on the playground. We found a square waste paper board with an area of about one square meter near the playground. My cousin looked at it and said, "Xiao Jing, if you divide this cardboard into small squares with an area of one square millimeter, and then connect these small squares one by one into a straight line, how long is this straight line?" "I blurted out without thinking:" How long can this last? Four meters at most! " Cousin smiled and said, "Don't jump to conclusions yet, let's work it out together. "
I straightened my back and began to think for a while: 1 square meter equals100000 square decimeter, and the side length of a square with 1000000 square millimeter is 1000000 mm, so isn't it the same with 1000000 mm? Wow! This straight line, which consists of some small squares of one square millimeter, is as long as 100 meter.
At this point, I understand that learning mathematics can't be easily concluded just by looking at the topic. You have to think carefully and calculate carefully before you can do it right and explore the mystery.
Thursday, 9 September 2004
Feng Huilan, Class 5 (1)
This morning, the teacher gave out the math exercise books. I looked at it and said, "What happened to an application problem?" I said in surprise. A closer look reveals that one step of conversion is missing. I thought it over. How many kilometers should 20400 meters be equal to? 20400÷ 1000=20.4 (km) Oh, it turned out to be 20.4 km, so I filled it in and gave it to the teacher for approval. The teacher looked at it and said, "The unit of 340×60 should be meters, not kilometers." I looked at it, and it turned out that the units in the above formula were wrong. I changed it again, and this has just been approved by the teacher.
Today is the first time I have approved it for the teacher twice. I used to be able to approve it once. I think we can give teachers a batch of good students at a time, so I used to be an upper-middle class in Shi Yang.
Math diary
Han Yin of Class Five (1)
Today is Sunday. My mother opened my exercise book and looked at it. "God, how can you make so many mistakes?" My mother turned over as she spoke, only to see her face getting redder and redder and looking very hot. I glanced at her face, her voice was a little rough, and said, "Can't you know any of these questions?" I shook my head, and my mother's face turned redder. At this time, my mother took out the draft paper from her bag, brushed it with a pencil and wrote two formulas: 0.76 ton = () kg 2.85 kg = () kg () g. My mother asked me how to do these two questions: the answer to the first question was 760 kg, and the answer to the second question was 2 kg 850 g. My mother asked me what I thought. I thought about it and said, "If the unit is large, multiply it by the forward speed. If the unit is small, divide it by the forward speed. " . At this time, mom's anger is gone.
It will be fine on Friday, September 17.
Class 5 (3) Qian Jinyu
Do you believe in yourself or others? If I choose, I must believe in myself, and there is only one thing to prove. Once, the teacher gave out a math workbook to practice, and a classmate came to see my workbook. He said I made mistakes together, but I don't believe him. I just won't change. No matter how I explain it, he just won't listen to me, and then we shouldn't listen. At first I wanted to change, but I controlled myself and insisted that I was right. The next day, the teacher handed out the exercise book. I found that I was right. I am very excited. I'm confident that I'm right, even if I'm wrong, but it's worth it, because I didn't peek at others.