My first article in math diary 20 1X year x month x day x week x sunny.
My sister and I are having a good time, and my grandmother insists on calling me and asking me to settle her account.
Grandma bought 3 Jin 4 Liang eggs, 3 yuan and 50 cents per Jin. Grandma handed it in 12 yuan. How much should I get back? As soon as grandma's voice fell, grandpa said, "Change 1 minute!" I don't believe that grandpa can calculate so fast, so I use the mathematical knowledge I have learned to calculate: unit price multiplied by quantity = total price; Money spent = change, exactly the same as grandpa's. I asked grandpa why he calculated so fast. It turns out that Grandpa divided the 5 corners of 3 yuan into 3 yuan +5 corners, first worked out 3.4 times 3= 10.2 yuan, and then worked out 3.4 times 0.5, that is, half of 3.4 is 17 yuan, so one. After grandpa finished, I realized that he used multiplication and division.
Through this incident, I understand that mathematics can be used anywhere around us. Let mathematics serve us!
My math diary article 20 1X year x month x day week x sunny.
Gold is the same as kg, but it has different uses. Today, I asked my grandmother, and she told me the transformation methods of Kim and kg. I will simply write it again here;
1 kg =0.5 kg = 10 two =500 g and then tell me? Kilogram? It is the national legal unit of measurement, 1 kg =1000g. ? Gold or two? It should be? Gold or beam? Commonly known as Gold or two? It is a unit of measurement abolished by the state, 1 kg = 10 Liang or 1 kg = 500g. So the conversion relationship between kilograms and grams, kilograms and two is: 1 kg = 1000 grams =2 kilograms =20 ounces.
Moreover, I checked the information on the Internet and learned that "knowledge of kilometers" is the teaching content of the first lesson of "knowledge of kilometers and kilometers" in Chapter 4 of Book 9 of mathematics textbooks for mentally retarded schools. Although kilogram is a common unit of weight in life, it is difficult for students with mental retardation to establish the concept of kilogram because gold has not completely disappeared in life and students are not very familiar with it. Furthermore, the unit of weight is not as intuitive and concrete as the unit of length, so it can't be observed with eyes, and can only be perceived with the help of tools and muscle feeling. In order to let students know the actual weight of each unit and apply it to practice, in the teaching process, students can take a look, weigh, guess and weigh it to increase their understanding of it. Kilogram? Perceptual knowledge of; By weighing the same object, the relationship between kilograms is obtained, and the forward speed of kilograms and kilograms is very specific. There are still some things that students should know about kilograms and Jin well.
For example, last class, the teacher left a survey assignment for the students. Let's go to the vegetable market to see how the vendors selling vegetables and fruits sell their wares, but I don't know how it ended. It can also be said that it is raw: a catty of potato 0.5 yuan, a catty of grape 2.5 yuan, and a catty of beans 5 yuan.
My math diary Chapter III 20 1X Year X Month X Day Week X Sunny
Take 10 to buy books on the third floor of Trust-Mart today.
I searched and found a book "Myths and Legends". When I saw the cover, I knew there were many wonderful stories in it. I decided to buy it, but when I saw the price, I was shocked again. It turns out that this book is 1 1 yuan. Feel the money in my pocket when reading this book. I'm really embarrassed!
The assistant aunt saw me embarrassed and asked kindly, what's the matter, little friend? I said shyly, I want to buy this book, but I don't have enough money? She asked again:? How much money did you bring? Only 10 yuan. ? I said. Aunt smiled and said:? Son, do you think the price tag still says? Discount books, 10% off all of them? . ? I asked:? What do you mean? 10% discount for all? Ah, aunt said: That is, nine tenths of the bid price is charged. For example, 10 yuan's books only accept 9 yuan. ?
I calculated that this book is only 9.90 yuan. ? Yes! ? I thank my aunt again and again.
I bought a satisfactory book today and learned knowledge. I'm so happy!
My math diary Chapter IV 20 1X Year X Month X Day Week X Sunny
Today, I watched my Intelligent Mathematics happily at home. I looked at it and saw an interesting math problem about math on a pair of Spring Festival couplets. The content inside is that the elders of the Yuling tribe lived in the late Han Dynasty, and the Queen of the Magic Kingdom led the courtiers to celebrate their birthdays. When she arrived, the witch Xiaoxing saw the elder's long white beard and couldn't help asking. How old are the elders?
It's naughty to bite the head of an animal elf. He had already heard about the mathematical ability of the subjects in magic kingdom. He decided to have a look today.
So, he wrote a question in the context of couplets:
Part I: Flowers reopen, plus 37 years.
Bottom line: ancient and rare, once more in spring and autumn.
At first, I didn't know where to start, because I didn't know what "flower armor" and "ancient rarity" meant. Later, my mother said: What does it mean? 60? What does it mean to be old and ancient? 70? Years old. Now, I finally have a clue. Online? Reopen? That is, the next two 60 s, three seven years? Is it 3? 7=2 1 year, and the upper part is 60? 2+3? 7= 14 1 year, bottom line:? Shuangqing? It's two 70s. Once in spring and autumn? Now it's 1 year, and the offline age is 70? 2+ 1= 14 1 year, so the elder's age is141+1= 282 years old.
Ah! Mathematics is so interesting.
My math diary Chapter 5
20 1X month x day week x sunny
Once, I went to explore the volcano and had a good time, but when I was about to leave, the rope fell into the magma. I think it's over this time, and I can't get out again. Suddenly, a monster behind me pushed me, and I fell, but I didn't fall. A red light flew towards me and said to me, as long as you can answer my question, I will send you out. Ask a question quickly. Suppose you and I are both * *100 years old. Five years ago, I was four times your age. How old are you and me this year? 1005*2=90 (years old) I: 90/(4+ 1)= 18 (years old) You: 100 18=82 (years old). ?
As soon as I finished, I lay in my bed. It was a dream.
My math diary Chapter 6
20 1X month x day week x sunny
One day, my father cooked braised pork ribs and asked me to buy soy sauce and sugar. I went happily with 20 yuan, and soon I came back panting, thinking that my father would praise me for successfully completing the task, but I didn't know that my father was a blow to me. Knocked out? He asked me:? How much is soy sauce? How much is the sugar? How much change do I have? I have a handful of money in my hand and I don't know how to answer it. My dad said: Next time you buy something, you must use math knowledge. We are sophomores. ? I nodded heavily.
Every few days, my father asked me to buy cooking wine and salt. This time, I can keep it in mind. I asked the boss carefully. Cooking wine 4 yuan 5 jiao, salt 2 yuan 8 jiao, * * * 7 yuan 3 jiao. I gave it to my boss 10 yuan. The boss smiled and said, how much should I give you, little friend? I calculated silently in my heart and reported 2.70 yuan at a time. The boss gave me a thumbs-up sign.
Come back this time, don't ask dad. I paid all my bills, and my father really praised me. I am very happy.