The first volume of the sixth grade is math diary's 500-word article I.
On Sunday, Yang Wen and I played 2 1 point. The rules of the game are simple: each person draws four cards and then uses them? + 、-、? The final number of these calculation methods must be 24.
The game started, and we each drew four cards. Alas! How come my cards are so bad! Listen, four people are all trump cards. At this moment, I only heard Yang Wen say: I can do it, you see, 5+5= 10, 10? 2=20,20+4=24。 ? I lost the first round. But I am not discouraged, because there are still opportunities in the future, and I must seize them and strive for them. I drew four more cards? 6、5、8、3? . I was so excited that I blurted out: 6-5= 1, 8? 3=24,24? 1=24。 Now 1 is even with 1. ?
Yang Wen said? What happened? I will definitely beat you in the next round. ? It's the third round, and I have drawn four more cards? 10、9、6、 10? . I was dumbfounded at first sight. Suddenly, I heard Yang Wen shout. 6? 4=24,24+ 1- 1=24。 2 1, I won. ? I watched him smug and helpless.
Although I lost the game, I think 24 o'clock is really interesting and math is really wonderful. I must study math well and use it flexibly in the future? +、-、? , mixed operation, in the next 24 points, we must use it with ease and be a master.
The first volume of grade six is math diary's 500-word article II.
On Saturday morning, my mother and sister went to Liangshan Park to play, and a big tree caught my eye. Mom asked:? Huanhuan, can you reach the height of this tree? Ok, use a bamboo pole as high as it and measure the length of that bamboo pole. ? Mom retorted:? Where did you get such a long bamboo pole? Me? Me? I scratched my head. Suddenly I caught a glimpse of the shadow of the tree on the ground, and an idea flashed through my mind: by the way, didn't the teacher just teach the knowledge of proportion? I said excitedly:? Sister! Lend it to you! ? My sister is full of doubts: how do you ask? At the same place, at the same time, the length of the shadow is proportional to the length of the object. Measure your height first, then the length of your shadow, calculate the ratio of your height to the shadow, and then measure the shadow length of this big tree, and you can calculate the height of this big tree. ? I am proud to say.
Because I usually like small production, I always take a tape measure with me. I first measured my sister's height 1.56m, and then measured the length of her shadow by 0.52m. Their ratio is: 1.56: 0.52 = 3: 1. I measured the shadow length of this big tree as 1. 1m, and then calculated the height: 65438. 3=3.3 (meters), which is the height of the tree. My mother and sister looked at me with thumbs up. I thought happily: Mathematics is really useful!
Math diary, Grade Six, Volume One, 500 words, three words.
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.
The final result is 374 cubic centimeters. My formula is: 209= 1 1? 19 19=2+ 17 1 1? 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.
After reading math diary's 500 words in the first volume of the sixth grade, I will still read:
1. Four 500-word model essays by math diary in primary school.
2. math diary, Grade Six, Book One
3. math diary Daquan, sixth grade primary school students.