Today, my mother and I went to the stationery store to prepare for the new semester.
When I arrived at the stationery store, I found that the stationery store had launched a promotion activity of "Buy 10 yuan, Send 1 Yuan Shopping Voucher", and the obtained shopping vouchers could be used as cash, which attracted many children to buy stationery.
I took a fancy to a beautiful pencil sharpener, and the price on it was 12 yuan. Next, I chose a ruler from 5 yuan, a test paper folder from 3 yuan and an eraser from 2 yuan. I calculated in my mind that I need 22 yuan. My mother and I went to the cashier to pay. As we walked, my mother said, "Yingying, what do you think should be done to save money?"
I paused, and suddenly remembered the "shopping voucher". If you buy goods from 20 yuan, you will get a shopping voucher from 2 yuan. Why not? ...
With this in mind, I first put the 2-yuan eraser back, and asked my mother to pay 20 yuan for the first three kinds of stationery, and then the waiter gave us a 2-yuan shopping voucher. I am happy to use this 2 yuan shopping voucher to "buy" my favorite eraser.
Through this shopping, I feel the importance of learning mathematics. I also found that as long as you observe carefully, you can find that mathematical knowledge can be applied to life.
How big is your land?
China has an endless vast territory, but it is also the most populous country in the world, and there are countless deserts.
I wonder if you have ever thought about how much everyone can get if the available land in China is "shared"?
China has a vast desert of 3.23 million square kilometers. Of course, the hot desert is barren and can't be used, so we have to subtract the area of 2.32 million square kilometers. 9600000-3230000 = 6370000 (square kilometers), so only 6370000 square kilometers can be shared with us.
Some people may think that some lakes have not been filled up and become land. Xinhui reclamation is also reclamation! Although this is also land, the area is relatively small, so it is ignored.
Then, the current population of China is 654.38+0.4 billion, and the per capita land possession is 6.37 million-1.4 billion = 0.00455 (square kilometers).
After listening to this result, do you feel a little incredible? Indeed, China has very little land per capita! And there are so many famous mountains and rivers in China, just like the Qinghai-Tibet Plateau, people can't live there. Therefore, such a small area may not allow you to live!
Through this math diary, we should know how to cherish land resources, and we must make good use of this land!
Calculate water and electricity charges
I received a receipt for water and electricity from the mailbox today. My mother asked me to count the water and electricity costs in the first half of 2009, and let me know the mathematics in my life, as well as my daily life and expenses.
I'll calculate the electricity bill first. The cost of 1 and February is 178.56 yuan, that of March and April is 208.54 yuan, and that of May and June is 269.08 yuan. My formula is as follows:178.56+208.54+269.08 = 656.65438. Through calculation, we know that the electricity bill for the first half of the year is 656. 18 yuan. Then I calculate the water fee. The cost of 1 and February is 33.8 yuan, March is 35.65 yuan, April is 37.5 yuan, May is 46.75 yuan, and June is 4 1.2 yuan. My formula is as follows: 33.8+33.8+35.65+37.5+46.75+41.2 = 228.7 (yuan), and the total water fee in the first half of that year was 228.7 yuan. Finally, I calculate three expenses. The monthly fee is 19.8 yuan,19.8× 6 = 1 18.8 yuan, and the fee for the first half of the year is118.8 yuan. What is the water and electricity expenditure in the first half of the year? 656.18+228.7+18.8 = 1003.68 yuan, and the water and electricity expenditure in the first half of the year was1003.68 yuan. I told my mother the final result, and my mother was shocked. I didn't expect the cost in the first half of the year to be so expensive. Mom also praised me for telling the answer so quickly.
By calculating the cost of water and electricity, I have increased my knowledge of mathematics and taught me to save energy, because energy will be exhausted one day. So we should save water and electricity.
Math diary
On Saturday, July 25th, it was sunny.
My aunt and I are going to Sanshui Lotus World tomorrow. Today, we must decide whether to go by car or with a tour group. For this matter, my aunt and I started a "war of words".
"Drive!" "Go with the group!" "Drive!" "Go with the group!" ..... these two answers are intertwined in my ear. I can't take it anymore. I shouted, "Stop!" Suddenly there was silence. "You can discuss it slowly and have a basis." I said slowly. "Ok, I'll go first." My aunt said, "I am in favor of driving because it saves money." "Isn't it more economical to join the group?" I said. "Really?" My aunt is puzzled. I solemnly said: "Listen, if you go to 59 yuan with the group, there will be four of us, and four 59 is 236 yuan;" If you drive, the tickets will go to 50 yuan. First you have to go to 200 yuan, and then you have to calculate the gas bill. At least there are four people in 50 yuan with one car, so it is 200+50=250 (yuan). Compare the two, 236
In the afternoon, we came to the travel agency to sign up. I hope you have a good time tomorrow!
Yesterday, I got 95 points in the math tutoring exam. I made a mistake in filling in the blanks and writing questions. The teacher reviewed the fill-in-the-blank questions for us before the exam. I didn't recite it carefully, but I remembered it carefully. I was thinking about something else when I recited it, and I didn't remember it at all.
So when I took the exam, I couldn't remember it anyway, so I just filled in the numbers. I didn't see the meaning of the title clearly, so it was wrong to write "X" as "+". This grade, the first 1 question is because my attitude is not correct, and the second question is because I didn't review it carefully. I will definitely do these two things in the future, but I can't be careless. Teacher, I can't get satisfactory results in every exam.
Since I took interesting math, I understand that the most important thing in learning math is understanding. It's no use just copying other people's answers. It's no use copying them. So I will listen carefully in the future and strive for excellent results.
Mathematics in the game
Moore Manor is a game that our primary school students like very much, which allows us to relax ourselves while reading intensively. At the same time, I also found that Moore Manor also contains a lot of mathematical knowledge, and playing games can also improve our mathematical level.
There is no furniture in my house in the game. In the game magazine, I found a set of beautiful small furniture, worth 3300 mol beans. However, I only have 3000 moles of beans. What should I do to buy this furniture?
So I used my brain and found that moll bean deposit bank has interest, and the interest rate is 3% per day. In other words, my 3000 moll beans are kept in the bank, and the daily interest is 3000*3%=90 moll beans.
A day later, my deposit became: 3000+90 = 3090 mol beans; Two days later, my deposit became: 3000+90× 2 = 3 180 mol beans; Three days later, my deposit became: 3000+90× 3 = 3270 mol beans; Four days later, my deposit became: 3000+90× 4 = 3360 mol beans. That is, after the fourth day, my savings can pay for furniture!
I think there is mathematics everywhere in my life, including games. As long as you use your head, many small problems in life can be solved by mathematics!
I began to learn multiplication of ten digits this semester. At the sight of multiplication, my head is big and dizzy. But today's experience made me make up my mind to learn math well.
Today is my birthday. My parents bought a lot of vegetables to celebrate my birthday. "Chef Dad" tied on his bib and started cooking.
Stop! Seeing that my father was quickly picking up the oil pan and pouring oil into it, I quickly shouted. Today, the aunt of the neighborhood Committee just issued an oil control bottle. Controlling edible oil can reduce the risk of diseases, especially the possibility of rich diseases. At my strong request, my father had to pour oil into the pot with an oil control bottle. Dad obviously couldn't adapt to cooking with an oil control bottle, so he fried a green vegetable and used nearly 50 grams of oil.
There are three people in my family. How much oil can we use every day if each person's daily intake of edible oil does not exceed 25g?
3×25=75 (g)
"Our family can only use 75 grams of oil a day," I told my father loudly when I calculated the amount of oil that my family could use a day. Now dad is confused. He has used 50 grams, with 25 grams left. How could he fry the following dishes?
It seems that "Chef Dad" is going to be laid off, and the dishes cooked today are not delicious except green vegetables. But our whole family ate delicious food, because we started a healthy diet. What's more, I used the math knowledge I learned to help my father correct his bad cooking habits.
Today, my mother said that she would prepare breakfast food for me tomorrow, so I came to the bakery with my mother.
Before coming to the counter, mother bought a packet of sliced bread. There are eight pieces in a bag of bread, and the price of a bag of bread is 16 yuan. At this time, my mother wanted to test me and asked, "Tong Tong, please calculate the price of each piece of bread?" God, it's that simple, just 16÷8! I thought to myself. So, I decisively replied: "Two yuan per tablet." Mom nodded and said, "If you need three pieces of bread for breakfast, how many days can you eat it?" I thought about it: 8÷3=2 is more than 2. Then he replied, "I can eat for two days, and there are two tablets left." The assistant aunt looked at me and said, "Smart boy." I blushed in an instant. Mother smiled and said to the shop assistant, "It's the third grade. Now is the morning meeting. "
Look, mathematics is everywhere in our life! I secretly made up my mind: I must improve my math scores.
These are for the landlord's reference, but there are no 30. Take these articles as examples, and write a few yourself!