High Quality math diary in Grade Four (1)
Today is Friday, and the test paper has been handed out. When I saw the results, I couldn't believe my eyes. I was only 86 points worse than last time. I am really ashamed and envious to see that others got a score of 100. I wish I could get a score of 100. But I blame myself for being careless, and I also blame myself for suddenly having a stomachache before I finished checking the first half of the test paper. I really don't know what happened.
And I clearly found a problem wrong, but I didn't have time to correct it. The question is 4 points. If I add up the scores of this question, I can get 90 points. This exam taught me a lesson: don't eat anything except dinner before the exam. And the check is to write quickly and carefully, don't write typos, or the right one will become wrong, and count it several times. Write the answer quickly and not carelessly, because there is still time to check later.
I will work harder this month, because I will face a final exam instead of a quiz. I will definitely work hard and try my best to get better results in the exam.
High-quality math diary in Grade Four (II)
Tonight, my cousin and I are playing on the playground. We found a square waste paper board with an area of about one square meter near the playground. Cousin looked at it and said, Xiao Jing, if you divide this cardboard into small squares with an area of one square millimeter, and then connect these small squares one by one into a straight line, how long will this straight line be? I blurted it out without thinking. How long can this last? Four meters at most! ? Cousin smiled and said:? Don't jump to conclusions yet, let's solve this problem together. ?
I sorted out my thoughts and began to think for a while: 1 square meter equals 100 square decimeter 1000000 square millimeter, and the side length of a square is 1000000 millimeter. Isn't that 1000000 millimeter? Wow! This straight line, which consists of some small squares of one square millimeter, is as long as 100 meter.
At this point, I understand that learning mathematics can't be easily concluded just by looking at the topic. You have to think carefully and calculate carefully before you can do it right and explore the mystery!
High-quality math diary in Grade Four (III)
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!
High-quality math diary in Grade Four (IV)
The annual math contest began. The forest is very lively. This year's contestants are: cotton seed, turtle, tiger and lion.
The game has already started. Teacher Swan first gave each of these candidates a test paper, and then said to them: whoever can calculate correctly and quickly in a certain period of time will win the Wisdom Cup Award. ?
As soon as Mr. Swan finished. These candidates began to write. Rabbits run fast and do fast. I saw that she was very clever and soon finished more than half of it. Come on, let's have a look at its test paper. ? Dizzy! ? You see: 80-70 =150,20? 4=80. How careless! I didn't even see the operation symbols clearly.
Look at the lion and the tiger. Hey! Why don't you see lions and tigers? I only saw a lot of manuscripts. Before I left, I saw lions and tigers busy! It turns out that every time a lion does something, he has to take out the manuscript paper to calculate. The more manuscripts are piled up, the more lion heads are hidden. Really simple-minded, developed limbs. Tigers are more exaggerated. Every time I finish a question, I will take out my manuscript and check it. No wonder you are sweating.
Finally, let's look at the tortoise!
The tortoise is usually slow-tempered, but this time its thinking is not slow at all. See how wonderful this question is: 3456-999 = 3456-1000+1= 2457. The tortoise uses a simple algorithm to finish the test paper quickly, and it is right and fast!
Finally, the tortoise won the wisdom prize.
High-quality math diary in Grade Four (5)
In the math interest class, Teacher Zhuang brought us an interesting topic:
During the Qianlong period of the Qing Dynasty, Emperor Qianlong traveled south of the Yangtze River and met an old man with a birthday boy.
Upon inquiry, the old birthday star 14 1 year-old, Emperor Qianlong gave the old man a couplet: flowers bloom again, plus March 7.
Emperor Qianlong asked his accompanying minister Ji Xiaolan to make a couplet, which was very difficult for him. His couplets are: Celebrate the ancient and the rare, celebrate the spring and autumn.
The teacher said: There is a math problem hidden in this couplet. Please calculate how old the old man is after listening to the teacher. Flower armor? It means 60 years old. Reopen? You mean two 60-year-olds. Sanqi? It means 2 1 year, and the first part is 60? 2+2 1= 14 1 year; Guxi means seventy years old. Shuangqing? It means two sevens. How many years? That means one more year, and the bottom line is 70? 2+ 1= 14 1 year. It turns out that there are also mathematical problems hidden in couplets!
In fact, as early as ancient China, scholars often made couplets to recite things and metaphors, and they were very good at embedding some numbers in couplets, which made them not only literary and interesting, but also informative.