Math diary, sixth grade, 500 words.
65438+1It will rain on Saturday, October 25th.
At noon today, I was doing math winter vacation homework. Unfortunately, I met a very difficult problem. I thought about it for a long time and didn't come up with one, so later. The problem is this: there is a cuboid, the product of the front and the upper two areas is 209 square centimeters, and the length, width and height are prime numbers. Find its volume.
I saw it and thought: this question is really difficult! We only know the area of two faces, and the volume must also know the length, width and height, but there is no hint at all. How does this start?
Just as I was scratching my head, my mother came. My mother first taught me to use the idea of equations to solve, but I am not very familiar with this method of equations. So, my mother taught me another method: first list the numbers and then exclude them one by one. First, we listed a lot of numbers according to the requirements of the topic, such as: 3, 5, 7, 1 1, and then we began to exclude them, and then we found that only1and 19 were left. At this time, I thought: one of these two numbers is the length of the common side of the front of the cuboid in the question; One is the front of the cuboid, divided by the sum of the lengths of other sides (both are prime numbers). So, I began to tell which number these two numbers were.
The final result is 374 cubic centimeters. My formula is: 209= 1 1? 19 19=2+ 17 1 1? 2? 17=374 (cubic centimeter)
I am happier than anyone to solve this problem. I also understand the truth that mathematics is full of mysteries, waiting for us to explore.
Sixth grade math diary 500 words second article
It will rain on Saturday, February 25th.
One day, my mother and I went shopping. Mom went into the supermarket to buy things and let me stand at the place where I paid.
I have nothing to do, just watch the assistant aunt collect money. After reading it, I suddenly found that the money collected by the assistant aunt was 1 yuan, 2 yuan, 5 yuan, 10 yuan, 20 yuan and 50 yuan. I feel very strange: Why isn't RMB from 3 yuan, 4 yuan, 6 yuan, 7 yuan, 8 yuan, 9 yuan or 30 yuan, 40 yuan or 60 yuan? I hurried to ask my mother, who encouraged me to say, Think about it and do the math, mom. I'm sure you can find out the reason yourself. ? I calmed down and thought it over. After a while, I jumped up happily. I see, because as long as you have 1 yuan, 2 yuan and 5 yuan, you can form 3 yuan, 4 yuan, 6 yuan, 7 yuan, 8 yuan and 9 yuan at will, and as long as you have 10 yuan, 20 yuan, 50 yuan, you can also form 30 yuan, 40 yuan and 60 yuan?
Mom nodded straight and asked me another question: Isn't 1 yuan enough if it's just for random combination? Why 5 yuan, 2 yuan? I said? It is inconvenient to use 1 yuan to form a larger number. ? Now my mother shows a satisfied smile and praises me for observing more and thinking more. I am really more comfortable than eating my favorite ice cream.
Here, I also want to tell other children: in fact, there are math problems everywhere in life. As long as you pay more attention to observation and thinking, you will find many unexpected discoveries. Try it if you don't believe me!
Sixth grade math diary 500 words three.
It will be fine on Sunday, April 8.
I have nothing to do today, and I want to help my aunt buy food. I thought I could finish math diary.
I came to the vegetable market and it was very lively. The noise is very annoying. I immediately bought my favorite chicken leg and couldn't wait to get there. I immediately asked the boss how much it was, and the boss replied. 4.5 yuan one:? I took out 10 yuan and gave it to him. He gave me the money and I left. I ran away without paying attention. When I went shopping, I found that I was 50 cents short, and I was going to change it. I was really confused at that time and immediately went to the place where I bought chicken. I am really careless. Why didn't I notice? The boss is also warm-hearted. He gave me the money without saying anything. I bowed my head in shame and said, thank you? And left.
I went on to buy a lot of things, but it didn't count. I decided to count patiently and finally got it. The result is the answer: 45.3 yuan. Dad gave it to me. Why is there only 4 yuan left in 50 yuan? What should I do? With a loss of 70 cents, what can I say?
As soon as I got home, I came to my father and said, Dad, I'm sorry, I miscalculated the money. Dad smiled and said, it doesn't matter, there are inevitably careless mistakes in life. ? I forgive you this time. Not next time. I heard what to say. Therefore, we should not make careless mistakes in general mathematics. If we make careless mistakes, we will suffer. I won't make mistakes in shopping in the future. Understand the last lesson.
After reading math diary's 500 words in the sixth grade, I will still read:
1. The first volume of grade six is 500 words in math diary.
2. Four 500-word model essays on primary school math diary.
3. Sixth grade math diary