6% grade math diary 5 articles 100-200 words.

I learned the percentage of land income, and I understand most concepts.

Here, I have listed a mathematical percentage formula table:

Percent represents the percentage of a number, which is called percentage, also called percentage or percentage.

Percentages are related to scores: 100% = 100%

How do percentages and decimals interact? A: Percentages can be regarded as fractions with 100 as the mother, and can be directly written as decimals. Removes the percent sign from the percentage and returns two digits. For example:

27% = 65438+27 %= 0.27

135% = 100 part of135 = 1.35

4 out of 5 =100 80 = 80% = 0.8.

This is my math diary, and I will continue to work hard to learn math better. China is a country with serious land desertification in the world. Over the past 40 years, China has initially managed more than 500,000 square kilometers, and the current soil erosion area has reached 1.79 million square kilometers. The problem of farmland degradation in China is also very prominent. For example, in the fertile northern wilderness area, the soil organic matter decreased from 5% ~ 8% to 1% ~ 2% (the ideal value should not be lower than 3%). The above shocking data made me realize the scarcity of resources in the world. Let's build a green home together! Let's learn math like this.

"I know how to play all day and how to read books." May Day Golden Week, just as I was having a good time, I suddenly heard the voice of a beautiful woman. You don't have to look at it to know that my mother taught me another lesson. "Mom, I have finished my homework." I pouted and answered. "Then I'll test you. If you do it right, I will reward you for playing for one day. " Hey, mom is going to check my study again. I often remind my mother not to get angry, otherwise it will affect her beauty.

Mother asked a question: "There is an isosceles triangle with two sides of 9 cm and 4 cm respectively.". You calculate, what is the circumference of this triangle? " It's too simple for me to listen to, and I really don't want to do it, but the thought of playing for a day makes me want to do it. I know that the focus of this question is the diversity of conclusions. Well, my math teacher has said many times that this is called a new course.

So I began to analyze: "If the 9 cm side is regarded as the waist, the circumference of this triangle is 9*2+4=22 cm. If I regard the 4 cm side as the waist, then the circumference of this triangle is: 4*2+9= 17 cm. " Three times five divided by two, I proudly told my mother my thinking process. Mom smiled and said, "You think very well, but do you dare to be responsible for your own results?" You go and show me the two triangles you just considered. "

What's wrong with building a triangle as long as I'm not allowed to study? I will build it. I made a triangle with great joy. The first triangle was built soon, and I did the same, but strangely, I put it around, but no matter how I put it, I couldn't spell a triangle with a side length of 4 cm and a bottom of 9 cm. What's going on here? It seems that the second calculation method I analyzed earlier does not exist in life. Two sticks with a length of 4 cm and a stick with a length of 9 cm cannot be combined into a triangle. I put my head on my head and told my mother the result. My mother smiled and said, "We must pay attention to the combination of study and application, and learn to be responsible for our own results. We can't take it for granted. "

Mother dropped this sentence and went to do housework. I don't believe it. Is it because my mother gave me a special condition that other situations are impossible? So, I continued my experiment. It turns out that the combination of 4 cm and 4 cm is only 8 cm, not 9 cm long. Of course you can't spell it. It must be at least the same length. So I changed the other one to 5 cm, but it still didn't work, so I changed it to 5.5 cm. What about 5.4? I shortened it on purpose, but it doesn't matter. I seem to understand something. Two short sticks together should be longer than 9 cm. Is it true?/You don't say. So I opened the math book again and measured the three sides of many triangles. As a result, I found that both sides add up to be bigger than Fang. I still don't believe it. I drew more than 10 arbitrary triangles, measured them, added them, and the result was still the same. I believe that the sum of any two sides of a triangle is greater than the right side. I started to get a little excited and said loudly to my mother, "Mom, you are misleading me. This is obviously impossible. How can I let it out? " My mother praised my scientific method of learning mathematics in time.

I went to school after May Day and told this story to my classmates at the class meeting. After I finished, I proudly asked everyone if there were any questions. Unexpectedly, the monitor asked loudly, "Your discovery is amazing, but we want to know why?" Now you have me stumped. Student: Do you know why? Got it. Call: 023-55**2266.

It is also a common multiple.

It rained on the night of Monday, April 7, 2003.

I used to think that learning the knowledge of "finding the least common multiple" was boring, and it was really annoying to deal with the problem of "finding the least common multiple of 1 1 2" 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 to test you, okay?" "I answered with confidence," OK! " "That you listen up, if the 1 bus runs every 3 minutes, then 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." Really? There is still one condition missing in this problem: 1 bus and bus No.3 start at the same place. Grandpa listened to my words, suddenly patted his clever bald head and said with a smile, "I am a doctor of mathematics, and sometimes I get confused. My questions are not rigorous enough, but I will still think carefully." Grandpa and I laughed happily. Then grandpa said, "OK, now suppose it's the same starting point. How do you solve it? " "I thought about it and blurted out," 15 minutes. 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: "The answer is correct! 100 points. " "Yes!" After listening to grandpa's words, I raised my hand happily. From this incident, I understand a truth: mathematical knowledge is really everywhere in real life.

Count wood skillfully