Mathematics diary composition 300 words

Recommended collection of 6 300-word mathematics diary essays

The day is over. I believe you will learn a lot, so why not write a diary now? So what is the format of the diary? Below are 6 300-word mathematics diary essays that I carefully compiled. Welcome to read and collect them.

Mathematics Diary Essay 300 words Part 1

I once saw such a news that the human heart is as big as the human fist. Today, I will measure my fist so that I can understand how big my heart is. But how should we measure our fists, which are irregular objects? I thought about it and finally came up with a good way, which is to use water to measure, because in our practical class we used water to measure potatoes!

I found a hollow cylinder with a ground radius of 4 cm and a height of 9 cm. I filled it with water, and then put my fist in. The water surface rose immediately, and I took my fist out again. The water surface immediately dropped from 9 centimeters to 4 centimeters. I then calculated the volume of my fist using "4 squared x 3.14 x (9-4)", which was about 251 cubic centimeters.

After I measured the volume of my fist, I was still not sure whether it was correct, so I used another experiment to prove it. The result was 250 cubic centimeters, which was not much different from the last calculation.

This experiment tells me that as long as you dare to explore, you will get unexpected gains. "Practice brings true knowledge!" 300-word Mathematics Diary Essay 2

This summer vacation, my father, mother, and sister and I went to Hainan for vacation. We took a plane. The distance from Urumqi to Sanya is about 5,800 kilometers. When going out, the speed is downwind, the wind speed is 20 kilometers per hour, and the flight time is 6 hours. This shows that the aircraft flies on average 967 kilometers per hour. When returning, the speed is against the wind. Due to the resistance of the wind, the flight time when returning is Extended by 0.5 hours, the total flight time is 6.5 hours, and the average flight time is 892 kilometers per hour. This results in the phenomenon that the return time is longer than the departure time, but the average flight time per hour is shorter.

The air tickets for my parents are full price 3050.00 yuan each, and the air tickets for my sister and I are half price 1525.00 yuan each. The total round trip for the four of us is (3050.00×2+1525.00×2)×2 =18300.00 yuan. The hotel we stayed in cost 1980.00 yuan per night for 6 days. The total was 1980.00×6=11880.00 yuan. We spent ***2800.00 yuan on fruit ***, 3500.00 yuan on meals***, and 1200.00 yuan on sporadic expenses. On this trip, our family spent 18,300.011,880.02,800.03,500.01,200.00=37,680.00. The average cost per person was 9,420.00 yuan. The accounts were recorded and organized by me. During this trip to Sanya, I not only enjoyed I'm so happy, and I also consolidated my mathematical knowledge. I'm so happy! Mathematics Diary Composition of 300 words Part 3

Today I found the "Primary School Mathematical Olympiad - Grade 3" that my mother bought for me, and started doing it.

When I finished a regular question "1000-81-82-84-85-19-18-17-16-15-83", I felt dizzy, () But as long as I find the pattern, I can solve the problem and I will think about it slowly. As I was thinking about it, I suddenly remembered that Teacher Yuan taught "round ten, round hundred" in the first grade. Then, I calculated it like this:

81+19＝100 82+18＝100 84+16＝100

85+15＝100 17+83＝100 100×5＝ 500 1000-500=500

Then, I wanted my mother to praise me, so I called my mother over and said to her: "Look, I can do this question." My mother said: " You are awesome!" My mother's words gave me great encouragement. At the same time, it also makes me happy.

Today, not only did I find out the rules of this Tao, but the most unforgettable thing for me was the encouragement I received from my mother. Mathematics Diary Composition 300 words Part 4

In this final math exam, there was a challenge question, and I did it wrong. I figured it out during the summer vacation. It was actually very simple.

The students lined up to do exercises, counting from the front, back, left and right, Xiaohong was the fifth one. How many people were there in the team?

Because Xiaohong is the fifth one from the front, back, left, and right, so we use 5+5-1=9 people and then use the square area formula to find 9X9=81 people to get the team. There are 81 people in a ***. In fact, I shouldn't have done this question wrong, just because I didn't use my brain. It seems that I need to work harder in math. There is also a question that seems easy but difficult to solve. When 40 students were doing three math questions, 25 people got the first question right, 28 people got the second question right, and 31 people got the third question right.

So how many people got at least three questions right?

First use 25+28-40=13 people to find the number of people who answered the first two questions correctly, and then use 13+31-40=4 people to find the number of people who answered the three questions correctly. There are 4 people. Did you do it right?

It seems that mathematics requires more thinking. Every time I think about it, it is no longer as simple as the first or second grade. Now that I am in fourth grade, I have to study mathematics well. When I encounter difficult problems, I just ask them. I will stop being lazy. ! Mathematics Diary Composition of 300 words Part 5

It was very cold this morning. I walked into the classroom shivering and took out the thermometer as usual and started to register my body temperature.

In a blink of an eye, it’s time for the long-awaited math class again. Yesterday afternoon we spent a class period to test the mathematics learning results during this period. At this time, the teacher must have read all the papers. After that, I thought about waiting for a violent storm to come.

Mathematics should be regarded as my strong point. I often achieve better results in exams, but sometimes I perform abnormally due to various reasons. For example, I am good at being careless. I can't forget the psychological shadow that the last exam left on me. Just as I was thinking about a figure pushing open the door and entering, he was wearing a black casual jacket and a dark yellow shirt underneath. He walked into the classroom quickly and without losing grace. Suddenly, the whole class Everyone calmed down and returned to their seats. Yes, he is our math teacher.

I also quickly returned to my seat and stared at the test paper in the teacher's hand in a daze while pretending to be attentive. After dozens of minutes, the test papers were all returned to our hands.

As expected, there was another question due to carelessness. Compared with the four points of dereliction of duty, there were many questions. I once suspected that my brain was short-circuited when I was doing the question. I was thinking hard about it. After thinking about the topic a little more diligently, I came up with the correct answer to the question.

After that, I also forgot how that class passed. I only knew that school was over soon and I spent another meaningful day. Mathematics Diary Composition 300 Words Part 6

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 per skewer. Meatballs was in a hurry and miscalculated the question and the price. He thought that the price was 1 yuan per skewer and only 5 would be given to the young people. The young man made the calculation and said to the meatball seller in a good voice: "You calculated wrongly." "I should have 10 meatballs." The man didn't listen. The young man tried to persuade him, but then he agreed and gave him 11 skewers. The young man said, "It won't be the same for me if I have one more. You can take it if you want." I want to be an honest and trustworthy person, and I can’t ask for one more thing. It turns out that mathematics helped me.

I also had a time. Today, my grandpa took me to get a haircut. I went to the barber shop to have my hair washed. The price for a hair wash was 5 yuan. After washing my hair, the owner of the barber shop was too busy because there were too many customers. My grandpa gave him 10 yuan, but he asked my grandpa for 7 yuan. I left without looking at the money. Halfway through, my grandpa touched his pocket and there was 2 yuan more money. After he sent me home, he went back and returned the 2 yuan to the confused boss. The boss felt ashamed. He rubbed his head and said, "It's all my fault for being careless. There are so many people that I can't handle it. ""

Among these two things, the most important thing is to be an honest and trustworthy person. Honest people will be blessed by God.

Sample Essay 4