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 is the elder?

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.

I didn't know where to start at first, because I didn't know the meaning of flower armor and ancient rarity. Later, my mother said, "Hua Jia means' 60' and Gu Xi means' 70'. Now, I finally have a clue. The reopening of the first part is two 60s in the next part, 3×7=2 1 year, 60×2+3×7= 14 1 year in the first part, and two 70s in the second part.

Ah! Mathematics is so interesting.

The second part: the difference between gold and kg

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 = 0.5kg = 10 = 500g and tell me that "kg" is the national legal unit of measurement, 1 kg = 1000 g, and "Jin or beam" should be "gold or beam", commonly known as "Jin or beam" is abolished by the state. 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' perceptual knowledge of "kilogram" is increased through practical activities such as watching, weighing, guessing and weighing. 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 potatoes, 0.5 yuan, a catty of grapes, 2.5 yuan, and a catty of beans, 5 yuan. ...

Part III: Expenditure

Another day, everyone went to the morning market. In the morning, a cold wind blew and I couldn't help shivering. Whether it's cold or not, you have to buy food after all! So we drove to the vegetable market.

"How much is this sweet potato a catty?" Mother picked up a rustic sweet potato and weighed it. "Eight points." The old lady selling sweet potatoes replied. "So expensive!" My mother shouted discontentedly ... After some bargaining, my mother still ended in failure. She bought two Jin at a price of 80 cents and spent 1 yuan 60 cents. Watching from the sidelines, my heart was filled with joy. "What a bargain!" .

Carrying heavy sweet potatoes, we involuntarily came to the most lively raw meat area. Wow, it's too crowded. My mother and I managed to squeeze in, but there was no meat we liked. We have no choice but to find another butcher shop. I really regret stepping on dirty leaves and dirty water. I know I won't come. My mother took a fancy to a piece of pork with more lean meat and less fat. The proprietress skillfully weighed the pork in a heavy bag, 8 taels, per catty 13 yuan. My mother took the opportunity to sound me out and asked me to work out the price: 13 times 0.8= 10.4 yuan. "It's equal to ten dollars and forty cents!" I shouted out. The proprietress praised me with surprise: "Yes, it will be so small!" I didn't say anything on the surface, but I was laughing inside. I have learned fractional multiplication!

"Be a pawn in the kitchen, be a pawn in the kitchen." I easily hummed a ditty and walked out of the lively raw meat area. I followed my mother to a food stall. My mother looked at the bright green vegetables, grabbed a handful and asked the price. It turned out that it was only 70 cents a catty. Later, my mother weighed a catty and spent 70 cents.

Time to go home. On the way, I calculated the total price carefully:1.6+10.4+0.7 =12.7 yuan. Ah, at the end of the day, my family's meals are 12.7 yuan, 38 1 yuan a month (30 days) and 4572 yuan a year. In this way, my family spent thousands of dollars on food alone, plus others, it can spend 10 thousand a year. It is better to be frugal.

Article 4: Buy clothes

Today, my father and I came to Huatang Commercial Building. First, let's buy clothes for dad. My father chose a dress that he particularly liked. It's just a 20% discount on the National Day special. My father asked me the price of a dress is 150 yuan. A 20% discount is equivalent to the price of a dress multiplied by 0.8. Do you know how much a dress costs? I think: 150*0.8, first consider 0.8 as 8, then calculate the result by integer multiplication, and finally see how many decimal places a factor * * * has, so start from the right of the product number and point to the decimal point. The result is 120 yuan. I replied excitedly that the price of this dress after 20% discount was 120 yuan. Dad asked me again, "Usually when one number is multiplied by another, the product must be greater than the factor, but why is the product of this question greater than one of the factors?"

I think, in class, the teacher said. I said confidently, "The product of a number multiplied by more than 1 is less than the original number. Dad said, that's a coincidence. So is there such a rule for division? " "Of course, when the dividend is greater than 0 and the divisor is greater than 1, the quotient is less than the dividend. When the dividend is greater than 0 and the divisor is less than 1, the quotient is greater than the dividend. " Dad said, "Then I'll test you again. How much is the current price of this dress at a 50% discount in 200 yuan? " My quick answer: "100 yuan". Dad said happily, "My daughter has learned to extrapolate!" "

After buying clothes, we went to the underground supermarket. My dad told me: "The dairy products in the store are all on sale. If you buy two boxes, how much discount? " I said, "I don't know." Dad said, "buy two and get one free, that is, spend two boxes of money to buy three boxes of milk." A box of 50 yuan is equivalent to spending 1 yuan on 150 yuan's milk. Then dividing 100 by 150 is equivalent to his discount. The result was about 30% off. You got it? "I said," I see. "

It is increasingly found that mathematics is used to solve problems in life!