Every Spring Festival, students will certainly receive many lucky money from their grandparents, grandfathers and grandmothers. Many of our classmates don't know what to do in the face of so many lucky money: some students buy it in buy buy with lucky money, and they have developed the bad habit of spending money indiscriminately since childhood; Some students left the lucky money with them and accidentally lost it, which brought a burden to the family; Some students simply put the lucky money in the bank, which is inconvenient when they need it.

In fact, I have long had a wish that we set up a "lucky money bank" at school to save all the students' lucky money. On the one hand, it can control those students who usually spend money lavishly, help them get rid of the bad habit of spending money indiscriminately, and at the same time facilitate those students who need money; On the other hand, schools can deposit money in the bank and earn a lot of interest. We can use this interest to help those students who drop out of school because they have no money to study. If students can save much money, they will deposit it in the school's "lucky money bank", and then the school will deposit the students' lucky money in the bank, and return the principal to everyone when they graduate, and the interest will be donated to students with financial difficulties or people in disaster areas. Then we did something very meaningful.

To tell the truth, we have collected lucky money for more than ten years since childhood, at least several thousand yuan. If the average person deposits in the bank every year according to the 300 yuan, each student in the sixth grade can deposit 1800 yuan. Our school is small, with only 17 classes, two classes in Grade One and Grade Two, three classes in Grade Three, four classes in Grade Five and four classes in Grade Six. If there are 45 students in each class, students in class 17 will keep the lucky money in the bank for one year, and the annual interest rate will be calculated at 2.25% (the interest rate of the People's Bank of China).

(300× 2.25 ℅×1)× (45×17) = 5163.75 (yuan)

If the number of classes and students in our school remains the same every year, then our school will have a fixed interest income of 5 163.75 yuan every year. There are several schools in our town. If every school establishes small banks, their interest income will definitely exceed ours. If every student insists on keeping the lucky money in the "lucky money bank", the interest income of the whole school will be many times higher every year after five or six years. With this money, on the one hand, we can help those children who are out of school because of lack of money; on the other hand, when there is a natural disaster in our country, we can use this money to help the children in the disaster area, so that they can have a good learning environment like us (like last year's snowstorm and Sichuan earthquake).

For the prosperity of the country and the harmonious development of society. Students, act quickly, take out your lucky money and deposit it in the school's "lucky money bank" to give our love! The above is my little wish, which I hope will come true one day and make my own contribution to building a harmonious society.

Win a coin skillfully

I remember one day in the summer vacation, we went to my uncle's house and had a good time. My uncle came up with 10 coins and said, "Do you want these coins?" "Of course I want to!" Everyone answered with one voice. I looked at my uncle, a bit like a monk-scratching his head. I'm curious about what medicine my uncle is selling in the gourd. "If you want these coins, you must answer my question. Whoever answers correctly will get the coin. " Then my uncle asked a question: "How to put 10 coins into three cups, so that the number of coins in each cup is odd, and who can find the most way?"

After listening to my uncle's topic, everyone thought hard. I saw my cousin walking around in the living room, sitting in a chair and thinking calmly. Soon, I saw my sister find the material and try to do it. However, after doing it for a long time, my sister still didn't find a specific solution to the problem. In order not to be surpassed, I think with my head. Oh, if only I could get this coin!

After more than ten minutes, no one thought of what to do. My uncle saw this scene and said to us, "I'll give you a hint!" Learn to turn around a few times to solve this problem, don't ... ""Wait! " Words haven't finished, my cousin seems to think of something. I saw him pick up the coin of 10, first put the coin of 1 in the cup of 1, and then put three coins in the second cup. Seeing this, I can't help thinking: this method, which I have been thinking for a long time, simply won't work. There are six coins left, and six is an even number. I can definitely say, "This method. When my cousin put the remaining six coins in the third cup, I interjected, "This method is simply …" Before I finished, my cousin interrupted me. Cousin, you'd better watch me perform! " Cousin said proudly. I saw him pick up the cup of 1 and put the coin in the third cup. "This is the first method. "My cousin made a proud face." Oh! How stupid am I to give up at the thought of the third step? Really not worth it! "Then, my cousin did what he did for the first time, first put three coins in the cup of 1, then put five coins in the second cup, then put the remaining coins in the third cup, and finally put the coins in the first cup in the third cup. This completes the second method. According to this method, my cousin made 13 times in a row.

Seeing this, the uncle standing by clapped his hands and nodded, "I never thought that you, a kid, still had time to think." You won this time, and all the 10 gold coins are yours. " Uncle praised his cousin and touched his little head. "However, light rain, you must work harder. This time, even my cousin beat you. Remember, think more about everything and don't give up easily. "

Yes, uncle is right. Think more about everything and don't give up easily. If I hadn't given up the third step just now, I would have used my brain to solve the problem again. I really want to work harder in the future, learn math well, master math well, and learn to use math flexibly in my life.

Aunt's math problem

My mother runs a stationery store. Today is Sunday. My mother has something to do. Let me see the store.

After a while, an aunt came. She said she had to test me before she could tell me what to buy. She said, "AARON Li bought a pencil and an exercise book and spent 0.48 yuan." Exercise books cost twice as much as pencils. What is the unit price of pencils and exercise books? "

I thought about it: exercise books and pencils are three times * * *, and the price of pencils can be calculated with 0.48÷3, so can the price of exercise books. I told the answer, and my aunt praised me: "It's good to analyze the topic carefully!" "Your exercise books here are 0 each. 6 yuan, each composition book is 0. 9 yuan, I want to buy 10 copies and give you 8. 1 yuan. Keep the change. How many exercise books and composition books should you give me? " I thought about it and said, "We assume that all the books in 10 are composition books, and you need 10×0.9 = 9 yuan, and you actually paid 8. 1 yuan, which is 9-8. 1 = 0.9 yuan, and the actual composition book is 0.9-0.6 =.

I figured it out. My aunt praised me for being smart, and I was flattered. Later, my aunt bought some stationery and I was still immersed in joy when I checked out. As a result, I miscalculated the money and found it. My aunt said to me, "You, if you praise me, I will get carried away." I misread the decimal point of the money I should have paid, and as a result I underpaid 15. 3 yuan. "

"I'm sorry, the decimal point moved one place to the left, which is 10 times smaller than the original price, with a difference of 9 times. As long as 15.3÷9= 1.7 yuan, it is 10 times smaller than before, so it is 1.7 × 10 = 65438. Aunt bought some more stationery and left.

Today, I broke my aunt's math problems one by one, thinking: Mathematics is ubiquitous and profound in life. I will work harder and strive for a higher level!