What are the main contents of the math diary for elementary school students?

Math diary? It's just a mistake book.

The sample math diary for elementary school students is as follows:

This morning, my dad and I went to the construction site to see an uncle. My uncle was counting the wood in the playground, and the wood was piled up in a trapezoidal shape, and when he saw us coming, he said, "You have come just in time, help me count the woods!" I'm dizzy. ”

I looked closely, and I saw that there was a pattern in this pile of wood, the lower row was always one more than the upper row! This is easy to do, add the number of roots in the top row to the number of roots at the bottom, and then multiply the number of the resulting number by the total number of rows of wood, and finally divide by 2 to get the total number of roots of the wood, and when I said the number, my uncle and father both smiled with satisfaction.

Last night, it was a hot day, and when I took out a watermelon to cut it, I was stopped by my father. He gave me a question that was: Cut this watermelon into nine parts, and cut out ten pieces of skin, see you cut it like this?

At this time, I thought, this is very simple. So, I went and got a fruit knife, put the watermelon on the table, and cut it.

I cut a "rice" shape, and when I counted it, there were nine pieces, but there were only nine pieces! I was not convinced, so I brought another watermelon, and when I was about to cut it, my father stopped me, and he pointed at me and said, "Oh, how many watermelons are you going to waste like this?"

I'll cut it! "Dad picked up the fruit knife and told me to watch it. I watched carefully, and at this moment, a question mark flashed in my mind, should I cut it like this?

When my dad finished cutting it, I counted it, and there were only nine pieces of skin, but he cut it in the shape of a "well". I looked at my dad and said, "Dad, didn't you cut nine pieces?"

Seeing that I was puzzled, my father said the "hiding place" of the tenth skin. It turned out that the tenth piece of skin was hidden under the "mouth" in the middle of the word "well".

That's when it dawned on me. At this time, my father looked at me and said, "There are numbers everywhere in life, as long as you observe carefully, you will definitely gain something, just like cutting a watermelon this time." I listened and nodded.

Math diary? ", that is, about the things that happen in life and related to the mathematical knowledge that have been learned, record them in the form of a diary, and only need to write one article.

The format requirements are as follows:

1. Paper size: half of A4 white paper, cut neatly, written vertically;

2. There should be a diary title, the following is the date, school, class, name, and then start the diary body;

3. The writing requirements are completely completed by the child, parents can not, and the more difficult words can also be written in pinyin or pictures;

4. The bottom of the paper can be accompanied by relevant pictures;

5. You can make the paper design more beautiful and generous, such as making an art frame that writes and respects Hu Xuliang;

6. Diary writing is done with a black signature pen.

Fan Wen: Today at noon, I was doing my math summer homework. Writing and writing, unfortunately encountered a difficult question, I thought about it for a long time and didn't come up with a reason, this question is like this:

There is a cuboid with the product of the two areas on the front and above being 209 square centimeters, and the length, width, and height are all prime numbers. Find its volume.

When I saw it, I thought, "That's a really hard question!" Only the product of the two surface areas is known, and the volume must also know the length, width, and height, and it doesn't hint at all. How do you get started?

Just as I was scratching my ears and cheeks in a hurry, a colleague of my mom came. He first taught me to use equations to solve, but I was not very familiar with this method. So, he taught me another way:

List the numbers first, then exclude them one by one. We first listed a number of numbers according to the requirements of the question, such as prime numbers such as , and then we started to exclude, and then we found that there were only two numbers left, 11 and 19. At this point, I thought:

One of these two numbers is the front of the cuboid in the question, and the common edge length on it; One is the front of the box, with another one on top of it.

The sum of the edges (and the lengths are prime). So, I began to tell which of the two numbers was which.

In the end, I got the result, which was 374 cubic centimeters. My equation is: 209 = 11 19 19 = 2 + 17 11 2 17 = 374 (cubic centimeters).

Later, I used the knowledge I had learned this semester: decomposing prime factors to solve this problem, and the result was exactly the same.

After solving this problem, I was happier than anyone else. I've also learned that mathematics is full of mysteries waiting to be discovered.

1. Write about learning experiences. Students' thoughts, experiences, inspirations, discoveries, etc., when they are learning mathematics, after taking mathematics classes, or doing mathematics homework, can be written in the diary.

2. Write about difficult learning problems. When students encounter difficult problems that cannot be solved while learning mathematics or doing math problems, they can write these problems in their diary and ask the teacher to help them solve them.

3. Write comments and suggestions to teachers. Students can write down their opinions and suggestions on the mathematics teacher's classes, assignments, homework corrections, extracurricular tutoring, examination evaluation, etc.

4. Write about your own innovation and discovery. When students learn mathematics and do math homework, what new discoveries, new ideas, new ideas, new methods, new ideas, etc.