It happened on a Sunday when the meter reader came. When it was copied to our home, the man was surprised and asked, "How did you use more than 300 tons of water in your home this month?" My mother was shocked when she heard this, but she just couldn't figure out where the water was used. He said to himself, "Is our water meter broken or is the water pipe leaking?"
After listening to it, I didn't quite understand the ins and outs of the matter, but I ran to the water meter and took a closer look. The number above is 866.7. I helped to calculate that the meter reading this month was 834.5 less than last month. In fact, my family only used 32.2 tons of water this month. It was that uncle who missed a decimal point when reading the meter and took 32.2 as 322. It's all caused by the decimal point playing a modest joke on us.
Decimals in life, math diary. Decimals really play a big role in life! You can accurately measure your height, weigh the weight of objects, and know exactly how fast you run ... Learn decimals. I remember that in the men's 50m rifle final of the 2008 Olympic Games, Qiu Jian finally led Ukrainian veteran Sukhorukov by 0. 1 0. If there is no decimal, how can such a critical moment decide the outcome?
In fact, our life is full of decimals all the time. For example, my mother told me that I grew 5.9 centimeters this year, a cup of yogurt 1.5 yuan, an egg 0.8 yuan ... Ah! The study of this lesson really makes me very happy, because I have increased my knowledge!
Weekly diary about decimals in life 1.
We learned decimals in class, but, students, do you know? Decimals don't just stay in math class, they are everywhere in our daily life, and our life is full of decimals.
Today, my mother and I went to the market to buy food. My mother bought some potatoes. When the aunt selling vegetables was weighing, I suddenly saw a familiar number on the display screen: "2.3". Haha, isn't it the decimal we just learned? At this time, there was another question in my heart: "Don't we usually say how much yuan and how many cents?" Then why not design a prompt that clearly shows 2 yuan's 3 angles and use decimals instead? "Thinking hard, I couldn't find a solution, so I had to ask my mother for advice. My mother listened to my doubts and replied, "This decimal display can simplify the calculation and make the calculation of money clearer. "Oh, I'm really taken aback. I didn't expect decimals to be really amazing. It lightens the operation burden and makes people think more clearly. Speaking of which, I really admire people who apply decimals to currency operations.
In fact, in our life, we are always in contact with decimals. Students will not forget the decimals in the supermarket. In any supermarket, there are price labels around every commodity, food and other things, which indicate the value of things with decimals we know.
Our life is beautiful because of decimals. Let's find more decimals in our life together, and let decimals become friends in our life!
2. Decimals in life
Zheng Yaobing, Class 3, Grade 4, Lianjiang Primary School
Decimals are an indispensable part of mathematics, but people who pay attention to life will find that decimals are often seen in life.
If the quantity is less than 1, it can be expressed by decimals such as 0.3, 0.5, 0.85, etc. If it exceeds 1, but it will be a little more, it can be expressed by 1.8, 2.5 and so on. Decimals are just to make the quantity more accurate. Composition title: Zi Xue Kao Shi. /
I used to calculate by fractions, but now I find that I can also calculate by decimals. I also know the decimal number table, decimal point, decimal point, percentile ... Although the decimal point is sandwiched between the middle and the bottom of the number, it is very inconspicuous, but it is very important. Once you miss it, the decimal point will become an integer. I also found that zero always follows the decimal, but the decimal doesn't care, as if it has nothing to do with them, so I can add as much as I want in the end. Once there are too many zeros, you can simplify the decimal by removing them, but you can't just remove the zeros before and in the middle of the decimal.
For some reason, people always like to move the decimal point. If the decimal point is moved one place to the right, it will be enlarged by 10 times; If the decimal point is moved one place to the left, the decimal point will be restored to the original one place. In this case, the size of the decimal will change.
Decimals are used in many places in daily life. For example: candy weighs 0.5 kg, height 1.35 m, gymnastics score 9.25, body temperature 37.5℃ and so on. We should pay attention to every number around us, and everything that uses mathematical knowledge may become a "little doctor of mathematics."
Comments: The author can grasp the characteristics of decimals, the role of decimals in decimals and the application of decimals in daily life, and express them in fluent sentences to let people know that decimals exist everywhere in life.
What decimal pictures are there in life? Make it clear.
The process of writing down the decimal in life and finding it. Supermarket, shopping mall, TV, 0.99 yuan, 99.9 yuan, incomplete.
I don't seem to have seen it in time and distance. I usually say integers. More money.
Interesting people in China and interesting people in China.
Legend has it that at the end of Qing Dynasty, Empress Dowager Cixi invited a famous calligrapher to write poems for her fans. Liangzhou Ci written by Wang Zhihuan, a calligrapher in Tang Dynasty;
The Yellow River is getting farther and farther away, because it flows in the middle of the Yellow River, and Yumenguan is located on a lonely mountain.
Why use the elegy of willow to complain about the delay of spring, old Yumenguan, a spring breeze is not blowing!
Due to negligence, the calligrapher forgot to write the word "Jian" Cixi was furious and wanted to kill him. The calligrapher used his quick wits and quickly explained, "Calm down, Lafayette, this is a sentence written in Wang Zhihuan's poems." And sentenced on the spot, read to the empress dowager cixi:
"The Yellow River is far away, white clouds fill the air, and Wan Ren Mountain is an isolated city. Why are you complaining about Johnny? Willow spring breeze, not Yumenguan. "
Hearing this, Cixi turned anger into joy and even called it wonderful.
Cleverly change couplets
Once upon a time, there was an old Jinshi, and his son was also a Jinshi. He was very proud. The next day, he prepared a rich banquet for his guests and personally wrote a couplet and posted it outside the gate. The first part is "father Jinshi, son Jinshi, father and son Jinshi", and the second part is "old lady, daughter-in-law, old lady". Because this old Jinshi is usually rich and heartless, relying on his wealth and power, he often bullies men, women and fish villages, and the people hate him very much. One of the scholars saw this couplet and immediately decided to play a trick on the old Jinshi to relieve his evil spirit. So, taking advantage of the night, he added a horizontal line under the word "scholar" in this couplet, a apostrophe on the word "husband" and two horizontal lines on the word "person".
The next day, all the guests invited by the old Jinshi came. Everyone snickered when they saw this couplet. When the old Jinshi heard the news, he saw that the couplet had become "father goes to the ground, son goes to the ground, father and son go to the ground;" A woman loses her husband, a daughter-in-law loses her husband and a mother-in-law loses her husband. "
The old Jinshi made a fool of himself in front of everyone, let out a cry and fainted, and everyone applauded.
Interesting math problems in life. Is there a problem? ! I suggest you buy a related book, which is better than this one.
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One word, dizzy ~ ~ ~
An interesting poem in life: Zheng Banqiao rejects thieves with poems.
Zheng Banqiao, a painter in Qing Dynasty, was poor when he was young. One day, when Zheng Banqiao was lying in bed, he suddenly saw a furtive figure on the enough paper. Thinking that there must be a thief coming, he began to recite poems loudly: "The wind is rising and the moon is faint. A hard-working gentleman is coming to cool down! There are thousands of volumes in the abdomen of poetry and books, and there is no half of the money string bedside. " Hearing this, the thief turned and ran. Zheng Banqiao read two more poems to see him off: "Don't scare the yellow-tailed dog when you go out, and don't hinder the green flowerpot when you climb over the wall." The thief hurried over the wall and escaped. He accidentally knocked down some wall bricks, so Zheng Banqiao's yellow dog chased the thief and bit him. Zheng Banqiao put on his clothes and went out, drank the yellow dog, picked up the thief who fell to the ground and sent him to the road. He bowed and recited two poems to say goodbye: "I will put on my clothes at night, pack my bags and start over." The thief was ashamed and ran away.
Su Xiaomei chooses her husband by talent, and there are many talented women in Sichuan. In the Song Dynasty, there was another Su Xiaomei. It can be said that in the Song Dynasty, Sichuan's exquisite spirit was attributed to Su Jia, his father Su Xun and his brothers Su Shi and Su Zhe, all of whom were brilliant people. The so-called "one father and son, three poets, eight writers in a thousand years".
Su Xiaomei is neither fat nor thin, with thin red lips, round face, dark eyes, high forehead and prominent chin. At first glance, he looks like a shrewd man. She likes bickering with her two brothers since she was a child. She is naive, especially her eldest brother, Su Shi, who is full of cheeks and beards, paunchy and informal, is the object of her bickering, so she quarrels at home all day. One day Su Dongpo joked about his sister's appearance and described her convex forehead and concave eyes as:
Three or five steps before going out of the hall, first go to the painting hall;
I finally wiped my tears several times, leaving two springs.
Su Xiaomei ·Xi·Xi smiled and immediately retorted:
There is a clump of mourning grass between the lips, and the hair is even apricot;
The quarrel was nowhere to be found, and suddenly I heard Li Mao's voice.
This poem mocks Su Shi's unkempt beard. Girls are most afraid of being told of her physical weakness. Su Xiaomei's forehead was protruding and her eyes were a little far away, so she was caught by Su Shi to make fun of her. Su Xiaomei said that Su Shi's beard didn't seem to catch the sore spot, and she felt that she didn't use it. When she studied it again, she found that her brother's forehead was flat and there was no feeling of much trouble. The other horse's face is a foot long and his eyes are far away. The whole facial features are out of proportion, and she immediately picked up a poem happily:
Tian Ping Road is 3,000 wide, and it is very happy from afar;
Last year, a tear of acacia never reached my cheek.
Su Shi patted his sister's head with joy and smiled: The proverbs played by Su's brothers and sisters can be said to be excusable, often with puns, which make you think.
One winter, in Chuqing after the snow, Su Shi was wearing a big fur robe and sitting in the sun. The wind blew and the fur fluttered. Su Xiaomei walked by. When he saw this scene, he immediately said, "The wind is picky." After that, I looked at Su Shi with a sly smile and a smug look. There happened to be some ice and snow on the wall in the corner where she stood. At this time, under the sunlight, the melted snow water dripped down the wall. Without thinking, Su Shi said smoothly, "The water on the wall is DC." Although Su Xiaomei is still young, he is in the early stage of understanding. He blushed at once, gave his brother a hard look and ran away quickly. On another occasion, Su Xiaomei squatted by the well to cut fish. Su Dongpo came back from the outside and rode by. As soon as he saw it, he immediately said, "Sister, cut the fish, squat down and cut it in half!" " Su Xiaomei hesitated, but he couldn't help it. He raised his head slightly, half ashamed and half angry, and said to his brother, "Brother rides a horse and adds a whip when riding."
The first month sprint tests the meaning of decimals in life. In primary school, the meaning of decimals can be understood from the following aspects: ① Numbers such as 0.5, 10.26, 0. 179 are called decimals; ② Fractions with denominators of 10, 100, 1000 ... can be expressed in decimals. Decimal is a special form of decimal; ③ Understand the specific meaning of each decimal. For example: 0.235 means 235 per thousand; It consists of two tenths, three percent and five thousandths (consisting of two 0. 1, three 0.0 1 and five 0.00 1); Only by understanding the meaning of decimals can we read decimals correctly according to the reading method of fractions; It is also the basis of decimal size comparison, reciprocity between decimal and fraction, decimal addition, subtraction, multiplication and division.