Rule 1: Take part in the competition.

On July 15, I participated in the swimming promotion training class held by Congtai Park Swimming Pool. The swimming pool is just south of my home, about 1000 meters away from my home. It takes my father about 3 minutes to take me from home to the swimming pool by bike, and our speed is about 330 meters per minute.

Training class1* * has 16 training sessions, and it takes 160 yuan to buy a student ticket, plus the registration fee of 5 yuan, so the average training fee is about 10 yuan.

After I checked in, I ran into the swimming pool excitedly. Wow! The main swimming pool is very big. It is 50 meters long and 25 meters wide. I calculated with my mouth that its area is 1250 square meters.

The coach began to teach us the essentials of swimming, and then we went into the water to practice. From 8: 30 to 10: 00, it takes about 1 half an hour. I train 16 times at a time, so I always train 24 hours after the whole training.

The coach also asked me to swim 10 times, which is about (25× 2× 10 = 500m). 16 after training, I have been swimming for about 8000 meters.

After the coach's guidance and my hard exercise, my swimming level has been greatly improved compared with last year, and I am determined to continue practicing next year.

Part II: My harvest and my confusion.

Our math class is coming to an end. I have gained a lot in the process of reviewing, and there are still some puzzles.

I think translation and rotation are very interesting. Because if a graphic is translated in reverse, it will become a beautiful lace. But to do this kind of problem, we must find the corresponding points and count the squares between the corresponding points.

After learning kilometers and tons, you will know how to use these two units. Kilometers is a long unit, which is usually used to measure the length of roads. The unit of tons is very heavy, so it is more suitable for weighing heavier objects.

All of the above are my gains, and my confusion is: the statistics we studied this semester is to average. The first step in finding the average is to find the total. It is easy to make mistakes when adding up many numbers, so be very careful.

Article 3: Writing about math diary

Writing a Chinese diary has long been a common practice for students. Math diary writes "Hehe", never heard of it! Let's take a look at how our class keeps a diary and uncover their "secrets" together. This semester, Teacher Zhang said, "From today on, I will write an article about math diary every week." "No way", the whole class cried out with one voice, opened their eyes wide and wondered what was going on. Why did math diary have to write? Teacher Zhang Zhang looked at our class with a surprised expression and said, "Don't take it amiss. Math diary just wants you to write out the whole process of what the teacher said in class today, and then think about why the teacher said so? " We nodded in confusion and went home.

The next day, as soon as "math diary" was handed in, Mr. Zhang smiled and said to us, "You see, some students listened carefully and couldn't remember. In desperation, they wrote down what they thought when they deserted, and there were many jokes. " After class, some students said, "There will be no more desertion in class, otherwise how can math diary finish it?" ? Keeping a diary is equivalent to reviewing. "It suddenly occurred to me that some people say that cows have two stomachs. The grass they eat during the day will be turned up and chewed at night. The same is true of math diary?