8 Selected Mathematics Diary Compositions
It’s the end of the day, and everyone must have learned a lot of new knowledge. It’s time to write a good diary seriously. How to highlight the key points in your diary? Below are 8 mathematical diary compositions that I compiled for you. I hope they can help you.
Mathematics Diary Composition 1
It will be sunny on Friday, August 8
Tonight at 8:08 pm, the Olympic Games will begin. When various countries enter the "Bird's Nest" At that time, my mother picked up the paper and asked me a question again. When the ceremony was about to end, my mother had written it. I took it and looked at it, and it turned out to be the area graphics question that I was least good at. The question is: There are 9 squares in a large square, and there are 9 small squares in each. The area of ??the small square is 0.5*3.8 square centimeters. Question: What is the area of ??the large square in square centimeters? Answering time: 10 minutes.
After reading the question, I quickly started doing the math. 0.5*3.8? The teacher never taught me, so I calculated it by myself. 0.5 was expanded 10 times to become 5; 3.8 was expanded 10 times to become 38. 5*38/100=1.9; 1.9*9*9=153.9 (square centimeters). At this moment, 10 Minutes have passed, and my father came from the study and asked about the result. I answered truthfully: "The answer to this question is 1.9*9*9=153.9 (square centimeters)." Mom nodded, smiled slightly, and gave it to me. A good score of 89 points, this is the best score I have ever received!
Today’s 89 points make me so happy! Mathematics Diary Composition 2
“100, 200, 300, 400, 500, haha, I’m getting rich, I’m getting rich, I got a 525 yuan commission from the lucky money this year! Plus last year’s total was 20xx yuan! "I said happily.
What is the best investment for this money? Buying stocks? It's too risky! Keep it at home? No, the money can't give birth! Keep it with dad? No, no ! Last year, he helped me save 1,000 yuan, but it turned out to be investment money to buy a TV. He also threatened that I would not be allowed to watch TV if I didn’t invest. There was no way the money was in his hands. I am a "little TV fan" I had to invest obediently. I couldn’t save it with him this year.
Just when I was worried, my mother came up with a good idea. She gave me 1,000 yuan every month. I take out 400 yuan every month, and I only take 100 yuan every month (a total of 1,500 yuan) and deposit it for a year. The interest we get is divided half and half. This is really a good thing. Just make money and not lose money.
I asked my mother in disbelief: Are you telling the truth? My mother smiled and nodded. I was afraid that she would regret it. I took out 100 yuan from the box and handed it to my mother.
So, how much interest can I get? (Hey, this is my biggest concern) I am with my mother. I found the interest calculator for lump sums on the Internet, and I entered the numbers as required -
Ah! The actual interest is 166.73 yuan! My problem is here again. How much interest can I get if I only save 100 yuan a month?
Ah! It’s only 11.12 yuan! So how much can I get for free? Where's the money? I picked up the pen and counted it carefully: 166.73÷2-11.12=72.24 yuan. Haha, I'm so happy to have gained more than 70 yuan! Mathematics Diary Composition Chapter 3
We often encounter mathematical problems in life, such as: when buying groceries, when shopping, when making transactions... We can use the methods we have learned to solve mathematical problems to solve various problems in life. Math problem.
Today, when we ordered takeout, the waiter on the phone told us that the price of the items had been adjusted a few days ago, so the prices of the items had increased.
The original price of the "Pian'erchuan" ordered by my father was 12 yuan. Due to the price adjustment, the current price is 15 yuan. So by what percentage is the current price increased compared to the original price? Divide the difference between 15 and 12 by 12, (15-12) ÷ 12 = 0.25 = 25. The original price of the "big row rice" ordered by my mother was 10 yuan, and after the price increase, it was 12 yuan. So by what percentage has the current price increased compared to the original price? Divide the difference of 12 minus 11 by 11, (12-10)÷10=0.2=20. Calculated based on the original price, the total price of two meals is 12 10 = 22 (yuan), and the current price is 15 12 = 27 (yuan). By what percentage does the current price of the total price increase compared to the original price? Use the difference of 27 minus 22 and then divide it by 22, (27-22)÷22≈0.227=22.7
Have you discovered the mathematical problem in this small restaurant price increase problem? ? Mathematics Diary Composition Part 4
This semester we learned about circles, which are beautiful shapes. Every shape has its own circumference and area. Of course, a circle also has a circumference and area. In this lesson we explored the circumference of a circle.
The perimeter of each figure refers to the length of the curve that surrounds the figure. Another "natural" thing is that the circumference of a circle also refers to the length of the curve that surrounds the circle. There is an important point when calculating the perimeter of every figure. For example: the most important thing for a rectangle is to know the length and width, for a square you need to know the side lengths, and for a triangle you need to know the base and width... "Of course" the most important thing about a circle is that it has two elements. In addition to what you just learned, Diameter and the "new friend" pi that was just added in this lesson. So what is pi? From the book, I know: the quotient of the circumference of a circle divided by its diameter is a fixed number. We call it pi, represented by the letter π, and it is usually taken as 3.14 when calculating. Even though the book said that, I still put it into practice. I used a piece of paper to draw a circle with a diameter of 8 centimeters. Next, I wrapped a thread around the circle. The length was measured to be the circumference of 25 centimeters. I divided 25 by 8. After calculation, it really equaled 3.13. I thought it was a coincidence, and after calculating a few different circles, I proved what the book said. I learned in the book that the circumference of a circle = pi times the diameter. From the teacher's words, I learned another secret of the circle: the radius expands (shrinks), the diameter also expands (shrinks), and the circumference also expands (shrinks) by the same multiple. The circumference of a circle is really interesting. In my knowledge and ability, I discovered that the circumference can also be multiplied by another number. For example: the front wheel of a road roller has a diameter of 1.5 meters and rotates 8 times per minute. How much does the road roller advance per minute? Meters? This is to first calculate the number of revolutions in one revolution (that is, the circumference), and then multiply by 8 revolutions. That is 1.5 times 3.14 = 4.71 meters, then 4.71 times 8 = 37.68 meters. "Of course" if there is multiplication, there is division. Question 6 on page 28 of the book is a classic question. There are also skills when calculating the circumference of a circle. If we remember the answer to multiplying each number by 3.14, it will be very easy for us to solve the problem.
There are many "natural things" in mathematics, and there are also many secrets. As long as we explore carefully, we will find that there are many things in mathematics that we don't know. Mathematics Diary Composition Part 5
"Ring, ring, ring..." The clear and melodious school bell rang. This class is a mathematics class. The students sat quietly waiting for Teacher Fu to come to teach us. Who knows, what we were waiting for was the fifth unit exam.
After a while, Teacher Fu walked into the classroom with heavy steps, holding a dozen test papers in his hands. When she got to the podium, she said in a loud voice: "Today we will take the fifth unit test!" As soon as she finished speaking, some students sighed, while others were very happy, as if they had a winning fist in their hands. I thought to myself: "Although this unit is difficult, I have reviewed it and I still understand the main knowledge points. This exam should not be a problem for me. Come on! Come on! Try to get good results." At this time, the test paper was passed around When it came into my hands, I immediately picked up the pen and worked every question seriously with all my energy. I had solved all the previous questions one by one. Suddenly, there was a "blocker" blocking my way and not letting me pass.
This "stumbling block" was so powerful that I was as anxious as an ant on a hot pot. At this time, my mind went blank and I couldn't think of a solution to the problem. I thought to myself: "I'm going to fall into a trap this time! A lot of points will be deducted for one question!" I thought about it but still couldn't think of it, so I wrote down an answer at random. I continued to work on the following questions.
In the afternoon, the scores came out, and Teacher Fu asked the monitor, Lei Zhihao, to hand out the test papers. When he called my name, I was very excited and thought, "How many points did I get? God bless me, I must get above 90 points, otherwise, I will be GOODBY!" I walked up Go ahead, pick up the test paper and take a look, ah! 94 points, I was very happy looking at the score.
Passing this exam made me understand: I can’t eat hot tofu in a hurry. As long as I work harder on my studies, I will definitely get good results! Mathematics Diary Composition Part 6
Today, my parents went to work, and my grandparents went out to eat. I went to "Home Alone" for myself. So I went to the vegetable market alone to buy vegetables.
Arriving at the largest vegetable market in Xiongzhenlou, the smell of vegetables hit my nose as soon as I entered the door, making me sneeze. I walked in and saw a vegetable stall selling celery. The celery here was priced at 1.5 yuan per pound. The stall owner saw that I was a child, so he said, "Child, are you here to buy vegetables alone?" I said, "Yes." "Yes, can this celery be cheaper?" The stall owner smiled at me and said, "Since you are a kid, I will give you a 20% discount." I calculated that the celery here would be 1.2 yuan a piece after the discount. catty.
I walked around again and saw another stall selling celery. I walked up to the stall owner curiously and asked: "Uncle, how much does the celery sell for here?" After sorting the vegetables, he walked over to me and said, "Kid, the celery here is very cheap at 1.8 yuan per pound. How about I give you a half discount? I calculated in my mind that after the half discount, the celery is 0.9 yuan per pound. I bought a lot of vegetables today: celery, bamboo shoots, mushrooms, tofu, and pork. I hope I will have the opportunity to buy vegetables myself.
Learning mathematics is not only related to our academic performance, but also can help us a lot in life. Recording it in the form of a mathematics diary is also a good commemoration. Mathematics Network has compiled an article for you Fourth grade math diary for your reference.
Today I saw a young man on TV buying meatball skewers for five yuan. The uncle who sold the meatballs priced them at 0.5 yuan a piece. Skewers, selling meatballs. In a hurry, he miscalculated the question and the price. He thought that the price was 1 yuan per skewer, and only 5 were given to young people. After the young man calculated it, he said to the man selling meatballs in a good voice: " You miscalculated, it should be 10 meatballs. "The man didn't listen and changed his mind. The young man tried to persuade him, and then he agreed and gave him 11 strings. The young man said, "I don't want one more string. You can take it back. You must be an honest and trustworthy person. I couldn’t even get one. It turned out that mathematics helped.
I also had a time. What happened today finally happened. My grandpa took me to a barber shop to wash my hair. The price of washing my hair was 5 yuan. After washing my hair, the owner of the barber shop complained because of the customer. It was too much and I was too busy. My grandpa gave him 10 yuan, but he asked my grandpa for 7 yuan. My grandpa left without looking at the money. Halfway through, my grandpa touched his pocket and there was 2 yuan more money. Grandpa gave me After sending it home, I went back and paid the 2 yuan back to the confused boss. The boss touched his head in shame and said, "It's all my fault for being careless. There are so many people and I can't handle it."
Among these two things, it is important to be an honest and trustworthy person. Honest people will be blessed by God. Mathematics Diary Composition Part 8
Today, my mother took my sister and me to Jiaxing to play. When we came back, I saw my mother giving the driver 23 yuan.
Later, I felt very strange. How did my mother know that I had to pay 23 yuan? I couldn't suppress my curiosity, so I asked my mother: "Mom, how did you know that you have to pay 23 yuan?" My mother looked at my confused look and said to me: "Now, taxi The fee is 5 yuan within 2.5 kilometers, and the fee is 1.8 yuan for each kilometer beyond 2.5 kilometers..." Mom looked at me, and then said, "Now I want to test you. "I just gave the driver 23 yuan. According to what I said, can you calculate how many kilometers we just drove?" I recalled the billing method my mother said in my mind, and I quickly figured it out. As a result, he happily said to his mother: "I know!
According to the billing method you just mentioned, you must first subtract 5 yuan from 23 yuan, and then there will be 18 yuan left, and this 18 yuan is included in 1.8 yuan per kilometer, so 18 divided by 1.8 equals the number of kilometers removed from the starting distance, and then plus the first 2.5 kilometers, so the distance traveled by the driver is 12.5 kilometers!” After hearing this, my mother gave me a thumbs up. Comments from famous teachers: The young author is very good at mathematics. He was able to solve the difficult problem raised by his mother through mental arithmetic in such a short period of time. I applaud you! The young author has a spirit of exploration. He can actively use his brain to think about problems in his daily life. When he encounters something he doesn’t understand, he asks adults for help until he understands it. This kind of studious spirit is also worth encouraging. I hope you can do it in the future. If you study with this humble and studious spirit, you will definitely be able to learn a lot of useful knowledge in the future.
The young author has good logical thinking skills. This diary records the thinking process of myself and my mother in calculating taxi fares very clearly, which is great! It is recommended that the young author develop another good habit in the diary, which is to add a little bit of his feelings about the matter and what inspiration he received after recording what happened that day. This will be more helpful for your healthy growth. It can also highlight the theme of the diary.
"Later I felt very strange: 'How did my mother know that I had to pay 23 yuan?'" was changed to "Later I felt very strange: 'How did my mother know that I had to pay 23 yuan?' ;