10 [label: handwritten newspaper materials, mathematics, handwritten newspaper] urgent! ! ! ! ! ! ! A messy point of view: 1 popularity: 1 solution time: 20 10-03-05 19:47.

Satisfied with the answer, some math diary or problem solving methods.

Grade?Six

Example 1:

Compare the scores by division.

It is sunny today. I was reading Mathematical Olympiad in Primary School at home, and suddenly I found such a problem: compare11111,1 165538. Suddenly, I became interested and took a pen and "brushed" it on the toilet paper. Soon, I found a solution Is to turn these two false scores into fractions and then use the law of fractions. The smaller the denominator, the greater the score. Solve111111

Really? "After listening to my mother's words, I immediately got angry and said," What, this question is difficult. " After that, I satirized my mother: "How tall you are, this topic is not a piece of cake for you!" " "Mom smiled:" OK, OK, I won't argue with you, but if you can solve this problem in two ways, it will be a high level. " I listened to my mother's words and looked at the problem again. I couldn't help thinking, "There are other solutions." I said in surprise. "Of course," mom said. "I won't do it anyway. It seems that your level is still very low. " I withheld my mother's words, and I was so angry that I did it again, which proved that I was a high-level person. Finally, through my efforts, the second method came out, which is to compare their sizes by division. You see, if one number is less than another number, then the quotient of this number divided by another number must be a true fraction. Similarly, if one number is greater than another, the quotient of this number divided by another number must be greater than 1. Using this rule, I use1111÷11. Needless to say, it must be the closest two, so1111111//. 1 1 1× 1 1 1/ 1 1 1 1 1、 1 1 1 1 1 / Kloc-0/11111×11,so it is. 1 1 1 1 1/ 1 1 1 1

Example 2:

At noon today, I was doing my math summer homework. Writing, unfortunately, I have a problem. I thought about it for a long time, but I couldn't figure out a way. The question 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! Only knowing the product of two surface areas, 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, a colleague of my mother came. He taught me to use the idea of equation to solve it first, but I am not very familiar with this method of equation. So, he taught me another way: list the numbers first, 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, and the other is the division of the previous one.

Sum of side lengths (all lengths are prime numbers). So, I began to tell which number these two numbers were.

Finally I got the result, which is 374 cubic centimeters. My formula is: 209 =119 = 2+171× 2×17 = 374 (cubic centimeter).

Later, I checked this problem with what I learned this semester: prime factor decomposition, and the results are exactly the same.

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.

Grade?Five

Example 1:

Time: 2010 065438+10.21.

In life, mathematics is everywhere. For example: buy food! Buy stationery! Measuring cloth, etc. , all need to use mathematics. This semester, the teacher taught a new knowledge, that is, the multiplication and division of decimals. This knowledge helps me a lot!

Last night, my mother went to buy oranges together. A kilo of oranges 1.8 yuan. My mother bought 4.5 kg and should pay 8. 1 yuan. But the clerk was careless and didn't know how to calculate it, so it became 9 yuan money. Fortunately, this semester, I used the knowledge of Protestantism, and after doing a calculation in my mind, I immediately corrected the salesman's mistake.

Not only did my aunt, the shop assistant, praise me for my cleverness and my ability to multiply and divide decimals in such a small city, but my mother also praised me for saving her 0.9 yuan on the way home, and the knowledge I learned can be applied in my life.

Yes! If you don't learn this math well, it's not only 0.9 yuan that will lose, but also hundreds, thousands or even hundreds of millions!

Math diary, Grade 5, Grade 3 (story of buying medicine)

Time: 2065438+00065438+1October 22nd.

On Sunday morning, my grandfather and I went to the pharmacy in the lotus pond and bought two boxes of pills-two boxes of Weiershu, one box of 44 yuan and one box of 22 yuan. Grandpa gave her 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.

Another time, 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.

Example 2:

Time: 2010 065438+1October 20th.

After school in the afternoon, the class teacher gave us a homework assignment, asking everyone to find a way to measure the volume of disposable chopsticks and record the measurement process in the form of math diary. On the surface, this assignment is a mathematical practice, but in fact it may have a deeper meaning, because the use of disposable chopsticks is related to environmental protection.

As soon as I got home, I sat quietly at my desk and thought about it. Disposable chopsticks are irregular three-dimensional figures. How do we measure its volume? I scratched my head and shook my head while reasoning. ...

Finally, small eyes. I can put disposable chopsticks in a container full of water, so that the water in the container will overflow. Isn't the amount of splashing water as big as chopsticks? But chopsticks are lighter than water and will float on the water. What shall we do? Can you fix chopsticks with stones or tape or something? I think it should be possible, but these methods are too troublesome to measure. If only there were a simpler way! After thinking hard, I finally smiled proudly.

Math diary Grade Five Grade Four (Mathematics Examination)

Time: 2010 065438+1October 28th.

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.

I wish I could help.