The number χ is very special. It looks like an "X". One day, several digital friends such as "1", "2", "3" and "4" got together to compare the sizes. Suddenly "χ" appeared in front of them and said, "Stop competing! You are no match for me! " 1 said, "How can you compare with us? You don't even know what you are, and you dare to come here and compete with us. Hey, what a young man! " Not convinced, χ jumped in front of χ 1 and said loudly, χ- 1=9, χ=9+ 1, χ= 10. Look, I am older than 9! "As soon as it heard" 0 "in the cave, it rolled out, pulled the number" 1 "and ran to" χ "and said," χ× 1=0, χ=0, smaller than anyone else. " After hearing "0", "χ" is no longer proud.
Math diary, fourth grade, 300 words Part II:
Mathematics problems in life During the winter vacation, my mother found a decoration company to redecorate the room. The floor of the living room was demolished and replaced with floor tiles. When calculating the area, I asked cheerfully, "mom, I already know how to calculate the area." Let me help you calculate. " I measured it with a tape measure, and the length and width of the living room are 5 meters and 3.8 meters respectively. Its area should be 5*3.8= 19 m2. I proudly told my mother that it was enough to buy 19 square meters of floor tiles. My mother smiled and asked me, "I want to buy a square floor tile with a side length of 6 meters." Can you tell my mother how many pieces I need? " I suddenly paused and calmed down for a while. I think: I'll work out the area of each floor tile my mother needs first, and then divide the living room area by its area, and then I can get the quantity. So, I first calculated the square area with a side length of 6 decimeters: 6*6=36 square decimeters =0.36 square meters; I divide 19 square meter by 0.36 square meter, which is about 52.78. Then 53 tiles in mom's living room should be enough. I proudly said to my mother, "Mom, just buy 53 tablets." My mother boasted that I knew I had applied what I had learned to my life. But when I paid the bill, I saw that my mother bought 56 tablets. I asked my mother strangely, "didn't you count 53 tablets?" Why buy three more tablets? "My mother told me that because of the loss in the construction process, if the size is not appropriate when it is accidentally cut, it needs to be cut again, so I have to buy more than the actual quantity. She also told me that life is concrete, and when using mathematics effectively, we must think more about the reality in life in order to make mathematics really close to our life.
Grade four math diary 300 words three:
The charm of mathematics is a mysterious number, as elusive as the mystery in the universe. 0 is also an important number. If you accidentally add an extra 0 or a less 0, the consequences are really unimaginable. This math exam really made me realize the importance of 0. It was 99 points when the test paper was handed out! I made a mistake at once. The result made me dumbfounded. The result is 45000-90. "How could I make a mistake with such a simple question?" I muttered to myself. I remember that when I dictated the 45,000-90 question, I easily wrote down 50, and I was still very confident. But in the end, I got 500, which was a 0. How wrong it is! What should not be wrong is also wrong. How important 0 must be! If I become the financial general manager of a company studying abroad in the future and someone else comes to withdraw money, I would have taken 10000, but I added 0- 100000 more, and I still put 10000 on the bill. Then who should I ask for this 90 thousand yuan? I will bear all the consequences! Through this incident, I understand that I should be meticulous in my work and study, otherwise the consequences will be very serious.
Fourth grade math diary 300 words four:
Math diary 300 words
During May Day, my mother and I went to the mall to buy clothes. However, I think the price there is very strange: saying "buy 100, get 100" means there is no money?
Mother said, "Silly daughter, how can you not use money?"
I said, "Because it says buy 100, get 100, which means 100- 100=0, so no money is needed!"
Mom said, "that's how you calculate." If so, everything in the mall is free, and many guests will come. This mall will lose a lot. "
Mom also said that you only need 50 yuan to buy 100 and get 100, you know?
After listening to my mother's analysis, I still don't understand. Why? It seems that I still have to go to the shopping mall to make a serious investigation or consult Ceng Laoshi to see what she has, because I know there is still a lot of math knowledge I haven't understood yet. With a happy mood, I came to the school to ask Ceng Laoshi a math question. Ceng Laoshi said, "In fact, some of them exceeded 65,438+000. For example,109,200, 189 or above ... "
The teacher added, "If the amount exceeds 100 yuan, you will get a coupon of 100 yuan. Customers still have to spend enough money 100 yuan to get the coupons. Not as free as you said. " Ceng Laoshi praised my questions and welcomed me to ask more questions in the future.
I solved the strange problem of "buy 100, get 100".
Fourth grade math diary 300 words five:
Math diary, fourth grade "Wash, wash! Oh yeah! " I hummed a ditty while doing housework. It's really cozy! "Rui son! Come and clean up this pile of umbrellas! " "all right! I'll be right there! " I jumped beside my mother. While playing an umbrella, I hummed a little song: "La la la! La la la! I am a small expert in umbrella! " "Hey? Strange! Why is this umbrella wobbly? Not stable at all! " I am very touched and puzzled. Mother also heard the sound, and we observed it carefully, only to find that a "rib" connected with the umbrella handle was broken. "Then why can't an umbrella with a broken rib be used?" The general impact should be small! "I feel very confused. Mother turned the beads around and came up with the answer at once, but she still said wittily, "Guess!" "Seeing my puzzled face, my mother couldn't help laughing and said with a smile," Look, there is a triangle between this' bone' and the umbrella handle, which is very stable and allows each umbrella to contract freely; If it is quadrilateral, it will be wobbly, unstable and unbalanced, which will be very inconvenient to use. " "oh! I see! It seems that mathematics knowledge is available anytime and anywhere! " I can't help secretly admiring.
Mathematics knowledge is really everywhere and widely used! What a "combination of mathematics and life"!
Grade four math diary 300 words six:
Buy a birthday cake for dad.
1 February is my father's birthday. My mother and I forgot to make it up today.
In the evening, my mother and I went to the cake shop to order cakes. I chose a big cake and asked for 50 yuan. Mother thought the cake would be ready in half an hour, so she bought three cupcakes for my father, sister Wang and me. Every cup of 2 yuan, all the way to 56 yuan. My mother asked my aunt to make it cheaper and only spent 55 yuan. Mother saw that there was only one last cup left in the window. Mom said, "We often order cakes at your house, so give us that cup!" " "Aunt agreed. In this way, we have four cups, which is equivalent to spending only 1 yuan 25 cents per cup. I bought these for my father voluntarily with lucky money.
After ordering the cake, we happily went to menstruation's house for dinner, and grandparents were still waiting there!