There is a cuboid, the product of the front and the upper two areas is 209 square centimeters, and the length, width and height are prime numbers. Find its volume.
I saw it and thought: this question is really difficult! Only knowing the product of two surface areas, the volume must also know the length, width and height, but there is no hint at all. How does this start?
Just as I was scratching my head, a colleague of my mother came. He taught me to use the idea of equation to solve it first, but I am not very familiar with this method of equation. So, he taught me another way: list the numbers first, and then exclude them one by one. First, we listed a lot of numbers according to the requirements of the topic, such as: 3, 5, 7, 1 1, and then we began to exclude them, and then we found that only1and 19 were left. At this time, I thought: one of these two numbers is the length of the common side of the front of the cuboid in the question; One is the front of the cuboid, divided by the sum of the lengths of the other side (both lengths are prime numbers). So, I began to tell which number these two numbers were.
Finally I got the result, which is 374 cubic centimeters. My formula is: 209 =119 = 2+171× 2×17 = 374 (cubic centimeter).
Later, I checked this problem with what I learned this semester: prime factor decomposition, and the results are exactly the same.
I am happier than anyone to solve this problem. I also understand the truth that mathematics is full of mysteries, waiting for us to explore.
play darts
Today, my father and I went out to buy darts. When I got home, my father hung darts on the wall, played with me and taught me how to keep score.
This dart is circular and divided into four circles along the radius. The red circle in the middle is 50 points, the second green circle is 25 points, the third red and green circle is three times that of the partition, and the fourth red and green circle is twice that of the partition. The outermost part consists of 20 black and white cells, and each cell corresponds to a score. Black, white, red, green and stainless steel gaskets form a beautiful pattern.
There are six darts. At first, we didn't follow the rules of the game, but each person threw darts three times to see who scored the most, so as to decide whether to win or lose. For example, a score of 20, a score of 7 for 3 times, and a third score of 18. How to calculate? That is 7×3+20+ 18 = 59 points.
Playing darts not only exercised my oral expression ability and hand-eye coordination ability, but also brought me a lot of happiness. I like playing darts.
Thinking after learning difficult problems
I learned a difficult problem today, and I feel very good. Because I used my brain. Dad said, "If you can't, use your head and think more." For example, I saw a topic: 388÷4. Do you know what this is? We haven't learned how to divide three digits by one, but I want to try. This is how I calculated it at first. 3 is not enough to divide by 4. I can add up 8 and divide 38 by 4 to get 9. I thought, what about 4×9=36? Hey! Yes, put 38-36=2, then add 8 to 2 and use 28÷4=7. I said happily, "This question is equal to 97!" "Dad praised me.
Math diary (1)
Today, my parents and I went to Shijiazhuang Zoo. Buy a train ticket first, adult 25 yuan, child 13 yuan. * * * spent 63 yuan.
When I got there, I spent 188 yuan in a hotel. The next day, we went to the zoo. I used 45 yuan when I went and 40 yuan when I came back. Adult zoo tickets 40 yuan, I 30 yuan. The return train fare is the same as when it came. On the train, I calculated that it was 509 yuan, excluding meals.
These two days, I am very happy, because I not only saw many beautiful scenery, but also knew all kinds of fares!
Math diary (2)
Today, my father and I went to the small supermarket at the door to buy things. When I got there, my father gave me 10 yuan to go shopping by myself.
After I went in, I took a packet of crispy noodles and spent fifty cents. Then I took a packet of shrimp strips and a packet of sweet noodle sauce and used 1.5 yuan. Then I took two pieces of white chocolate, 5 yuan. Finally, I took a bottle of iced black tea and a pack of crispy noodles, which cost 3 yuan. 10 yuan all spent.
This time not only let me know how to spend money, but also let me know the prices of some items.
Feng Zhaowei math diary
Math diary (1): How much did Mom earn?
On may 18, my mother took me to the bank to buy a fund.
I asked my mother, "What is a fund?"
Mom said: "the fund is a way of managing money."
"What is financial management?" I still don't understand.
"Is to invest your money after reasonable distribution, so as to obtain greater benefits. For example, invest in stocks, funds, bonds, or deposit in banks. " Mom explained.
"So we want to buy a fund?" I asked.
"Yes. I chose to buy a fund because its income is higher than bank interest and less risky than the stock market. " Mother continued to explain patiently.
"How much did you earn?" I asked.
"This needs you to calculate. I bought 10000 shares at 1.03 yuan and sold them at 1. 18 yuan. I have to pay the fund company a handling fee of 0.02 yuan each. How much did you say I earned? "
I quickly took out my pen and wrote down the following formula:10000×-1.18-1.03-0.02-1300 (yuan).
Mom smiled and said, "Baby, how clever!" " "
Ha, I became a financial expert, too.
Math diary (2): Shopping.
On Sunday, my grandmother and I went shopping. There are many vegetables and fruits in the market. The following are the prices of various vegetables: eggs: 3.5 yuan beans: 1.3 yuan soybeans: 2.5 yuan cucumbers: 0.8 yuan watermelons, 0.6 yuan apples: 1.5 yuan. We bought a catty of eggs, a catty of beans, a catty of cucumbers, a catty of soybeans, a catty of watermelons and a catty of apples, and spent a total of 3.5× 3+1.3×1.8×1.5+2.5× 2+0.
Haha, you see, I have worked it out. You have to take me with you when you buy food in the future!
Jin math diary
Math diary (1)
Saturday, July 29th, 2007 is sunny.
Yesterday, I wrote math diary's article at home and mentioned the unit of kilometers, so I asked my father, "How many kilometers does it take from home to school?" Dad said, "One * * is seven kilometers." Dad asked again, "Do you know how many kilometers you have to walk a year to pick up and drop off?" Do you need gasoline? Our car 1 00km needs 6 liters of gasoline,1liter of gasoline 5 yuan. "
Students, have you worked it out? Let's see if my calculation is correct. There are 365 days this year, 90 days in winter and summer vacations, 72 days in weekends, and now there are 203 days, which means that you have to go to school for 203 days a year and pick up and drop off twice a day: 4×7=28 kilometers, so the distance you have to walk in a year is: 203×28=5684 kilometers! The required gasoline cost is: 5684× (6 ÷100 )× 5 =1705.2 yuan.
Math diary (2)
Sunday, July 29th, 2007 is sunny.
Today, I came up with a math problem: Is it cheaper for our family of three to go from Handan to Qinhuangdao by train or by bus? I'll start now! Everybody get a pen, too!
Ha ha! I have worked it out. Let's check it together! Qinhuangdao is 700 kilometers away from Handan, and the fuel consumption is-100 kilometers, 10 liter of oil, one liter of oil is 5 yuan, and the toll is 300 yuan. I * * * Consumption: 700÷ 10=70 liters. 1 * * * Consumption: 70×5=350 yuan. Total: 650 yuan. Now it's time to take the train. Adults: 220 yuan hard sleeper children: 60 yuan half-price hard seat. Buy two sleepers, one hard sleeper, one adult, one child and one hard sleeper. Total: 500 yuan. The answer is out!
Math diary (3)
It was sunny on August 5, 2007.
Today, my mother signed me up for a swimming class, and Chen Manjia. After returning home, my mother asked me a question: Bibo Swimming Pool is 20 days 150 yuan, 2 hours a day. New Century Swimming Pool, 15 days 100 yuan, one day 1 hour. Where's the bargain?
I'm going to start. Forget it! Everybody ready? Please refer to my answer first! First, calculate how many hours it takes to learn a * * *: 20×2=40 (hours) 15× 1= 15 (hours), and then calculate a few yuan per hour: 150÷40=3 yuan.
Math diary (4)
It was sunny on August 6th, 2007.
Today, when I was drinking milk, I found a math problem, that is, I should drink milk every day (mom and dad drink it, not this time). A bottle of yogurt is one yuan in the morning and a bag of milk is one yuan in the evening. How many bottles of yogurt and several bags of pure milk do you drink every year? * * * How much?
Is everyone okay? Look at mine! According to the average year, drinking 365 bottles of yogurt and 365 bags of milk a year is 722 yuan for a leap year in 720 yuan. I have been drinking milk since I was two years old. I drank several bags of milk. How much did it cost? There are two leap years and six average years. Expenditure on a * * * in a normal year: 720×6=4320 yuan; A leap year: 722×2= 1444 yuan * * 4320+ 1444 = 5764 yuan! A ***5764 yuan! Has everyone figured it out?
Math diary (5)
Friday, July 28th, 2007 is fine.
Today, on the way to Qinhuangdao, I found a math problem, that is, how long does it take from Handan to Qinhuangdao?
The distance from Handan to Qinhuangdao is 700 kilometers, and the car speed is 100 kilometers per hour. Go to the toilet for 30 minutes, refuel for 20 minutes, and eat 1 hour. Have you worked it out? The formula I use is: time = distance ÷ speed: 700 ÷ 100 = 7 hours+1 hour +30 minutes +20 minutes =8 hours and 50 minutes. So it takes 8 hours and 50 minutes from Handan to Qinhuangdao. Have you worked it out?
Liu Yuchu math diary
Math diary (1)
-August 1
This is my arrangement for tonight. For dinner, I will eat 300g rice and 200g stir-fry for about an hour. After dinner, rest for 20 minutes, and then go out to play racing. The car runs 1200m per minute, which I can't catch up with.
At home, I turned on the TV and watched the news for half an hour. Then I took out "Little Peas Outside the Window" and read more than 20 pages. Ready to wash and sleep, I squeezed out 1㎝ long toothpaste, filled it with 100g water, and brushed it up, down, left and right for 3 minutes. Wash your face with 500g water for 8 minutes. When it's all over, I'll sleep comfortably.
Math diary (2)
-August 7th
I will fly back to Shijiazhuang from Hong Kong at noon today. At Hong Kong International Airport, I saw that our plane was Boeing 737, a medium-sized plane.
Entering the engine room, the middle passage is about 50cm wide, with three seats on each side, 25 rows and 8 business seats in the front. After the plane took off, I saw from the automatic pop-up TV screen that the plane quickly rose to the height of 7000 meters and the speed was 830 kilometers per hour. When ordering, I drank 300 ml of ice cream and ate 200 grams of rice, and everyone around me ate it with relish. After lunch, the beautiful stewardess aunt brought me a blanket with a length of 150cm and a width of 80cm, and I fell asleep in a daze. After about two and a half hours, we arrived at our destination smoothly.
Lu Qihai math diary
Math diary (1): A dazzling array of vegetable markets.
July 22(nd), 2007
Today, my grandmother and I went to the vegetable market to buy food. There are so many goods in the vegetable market! There are green rapeseed, red carrots and all kinds of fruits ... "Cheap, cabbage 1.2 yuan a catty!" "Come on, two pounds of potatoes and 2 yuan!" "Brine tofu is 90 cents a catty, and two catties are guaranteed!" The market is full of hawkers' cries.
Grandma and I came to a butcher shop and saw the sign saying, "Chicken leg 8.5 yuan, pork belly 9.5 yuan." Grandma asked me, "let's make a chicken leg stew with tofu at noon today!" " "."Great, I like this dish best, "I replied happily. So grandma bought 2 Jin of chicken legs and 3 Jin of tofu. I asked my grandmother what she wanted to eat, and she said, "Fried cabbage! "We bought another catty of cabbage.
On the way home, grandma told me that she always took 100 yuan and asked me how much money I had left after I bought chicken legs, cabbage and tofu. I calculated it silently in my mind: chicken leg 8.5*2= 17 yuan, tofu 0.9*3=2.7 yuan, Chinese cabbage 1.2* 1= 1.2 yuan, * * spent17+2.7. After I told my grandmother the answer, she said happily, "Congratulations on getting it right. My grandson is really smart! " "
Math diary (2)
August 23(rd), 2007
In badminton class this afternoon, the teacher asked us to run three laps around the playground, and also stressed that anyone who was overtaken by other students would be punished for running two laps more. I think, a circle of 400 meters, if you are overtaken by others, you have to run five times, 5*400 meters =2000 meters =20000 decimeters =200000 centimeters, my God! I feel dizzy at the thought of such a large number.
I started running, and I was able to run with the team in the first lap, but when I ran to the second lap, I felt weaker and weaker, my legs became heavier and heavier, and the sun seemed to be getting closer and closer to me. I can't wait to sit on the playground. Seeing that I was about to be surpassed, I gritted my teeth and rushed forward. Not only have I not been surpassed by others, but I have also surpassed a fat classmate in front!
This class is very meaningful to me, because I beat myself again!
Math diary (3) Happy Journey
July 27(th), 2007
Today, my family and my father's classmates traveled to Qinhuangdao by bus. On the way, I asked the driver how many kilometers this car can run in an hour and how many hours does it take to get to Qinhuangdao? He replied that he could drive 100 km per hour, and it took him about 8 hours to reach Qinhuangdao. 8* 100=800 kilometers, 800 kilometers from Handan to Qinhuangdao, I think it's so far! Mother said, "Son, when will you arrive at your destination?" I calculated silently: it will take about 8 hours for us to leave at 10 in the morning, which is 10+8= 18, yeah! It will be 6 pm when we arrive in Qinhuangdao. What a long time!
On the way, I was happy to tell jokes and play solitaire with the children. When our car was filling up at the high-speed gas station, my father's classmate Uncle Zhang asked me, "Lu Qihai, diesel is 4.64 yuan a liter. We need to fill up 50 liters at a time. How much does it cost? " I calculated: 4.64*50=232 yuan, "232 yuan!" " "I replied. Everyone said, "Congratulations on your answer." Uncle Zhang asked again, "We always have to supply and demand gas four times on the way back and forth. Can you tell me how much we always spend? " I confidently replied: "This is easy to calculate, 232*4=928 yuan!" "People in the car praised me for learning math well, and my heart was full of joy.
Due to the traffic jam on the road, we arrived in Qinhuangdao on 10 in the afternoon, four hours later than the scheduled time. Although I am very tired, I am very excited, because I can finally play at the seaside.
Ma math diary
Math diary (1)
Yesterday morning, my father and I set off at 6: 30, and it is estimated that we will walk at a speed of 50 meters per minute and arrive at Zhaoyuan at 7: 00. Today, we still set off at 6: 30, and when we arrived in Zhaoyuan at 6: 55, my father asked me what the speed was today.
I said it was a matter of distance. We must first know time, speed and distance. Their relationship is: speed × time = distance, distance/time = speed, distance/speed = time. I can judge how far my home was from Zhaoyuan yesterday. The time used is 7: 00-6: 30 =30 minutes, and the speed is 50 meters per minute, so the distance is 30×50= 1500(m). Today is the same trip as yesterday, but it takes 6: 55-6: 30 =25, so today's speed is 1500÷25=60(m/ min).
Math diary (2)
I found a problem today: there are two buildings in our compound. I measured about 40 meters. How many trees can you plant if you plant a tree every 4 meters? I think it's a matter of planting trees. I want to know the answer. First of all, I want to know how many 4-meter intervals there are. Then I want to know that two trees can't be planted because there are buildings at both ends. This is the problem of planting trees at both ends. So the number of intervals minus 1 is the number of trees that can be planted. The formula is: 40 ÷ 4- 1 = 9 (tree).
Tian Yifan math diary
Thursday, July 26th, 2007 is fine.
Book purchase order
Dad bought me four books from Shijiazhuang, and I looked at the payment receipt carefully. There are two math books, each of which is 1 1 yuan; Two English books, one is 13 yuan Hexagon and the other is 15 yuan. The total price finally marked is 40 points in 35 yuan.
I started to calculate: 1 1 yuan+1yuan+13 yuan 6 jiao+15 yuan =50 yuan 6 jiao.
I said, "No, Dad! You should pay the bookstore 50 yuan 60 cents! How to finally indicate that the total price is 4 cents in 35 yuan. "
"You forgot to make a 30% discount!" Dad said.
"What is a 30% discount?" I asked.
"Discount means that ordinary people will bargain when they buy things. In order to satisfy consumers' psychology and achieve the purpose of promotion, merchants convert the original price of goods into percentage and then lower the price of goods for sale. You can understand it as dividing the original price into ten parts, and giving a few discounts is equivalent to buying several parts. A 30% discount means that if something is worth 10 yuan, you only have to pay 7 yuan. " Dad said.
"Oh, I see. Then a 50% discount means paying five yuan, and a 60% discount means paying six yuan! " I said.
"Yes, now in order to test whether you really understand the meaning of discount, I'll give you a debut question. The original price of a thing 16 yuan, now it's 40% off. How much is it? " Dad asked.
I seriously think: the original price is 16 yuan, divided into ten parts, one is 1 yuan and 60 cents, multiplied by six, it is 9 yuan and 60 cents. So, I replied loudly: "After 60% discount, it will be 9.6 yuan."
"Yes, it's great!" Dad said happily.
I am very happy today, because I understand the meaning of price discount and learn new knowledge.
Wang Mathematics Diary
( 1)
There is a biscuit shop near my home. When I bought cookies, I saw that it took 7 minutes to process a pot of cookies. A can of biscuits is 7×5=35. You can buy four biscuits for one yuan, one for 25 cents, and a can of biscuits is 35×25=875 cents, which is only 8.75 yuan. A pizza in 60 yuan can buy about 60÷9≈6 pots of baked wheat cake, or 6×35=2 10 baked wheat cake!
(2)
Today, my mother went shopping in the "New Century" shopping mall and came back to buy me two pairs of Shanshan pants and a 1 Balabala coat. Mom told me the price and let me calculate it.
clothes
Original price (yuan)
Current price (yuan)
pants
138
25
short pants
96
25
jacket
Seventy-eight
39
total
3 12
Eighty-nine
Really much cheaper!
We analyzed it: the reason for Barabara's discount is that autumn is coming, and we miss the opportunity if we don't buy clothes in summer. Although Shanshan's clothes are greatly discounted, the manufacturer wants to clear the warehouse.
Wang Jianai math diary
(1) Cut watermelon
Today, my father and I met Zhao and her father while playing in Congtai Park. So my dad let them go to my house to eat big watermelons. When my father cut watermelon, he gave me a difficult problem:-How to cut nine pieces with four knives and eat the remaining ten pieces of skin?
I can only cut eight pieces, not nine pieces. Later, dad told us the answer. Dad said, "Cut the watermelon horizontally and vertically, then you can cut the TIC-tac-toe." The piece in the middle of the tic-tac-toe has skins on both sides, and there will be ten skins left after eating. You got it?
(2) separate the watermelons
When we finished cutting watermelons and eating them, Uncle Zhao said, "May I ask you a question?" We all say "yes". Uncle Zhao said, "I asked a math problem. If a group of people share watermelons, if each person shares two watermelons, there are five left.
Four per person, three is not enough. Ask a * * *, how many people are there?
I know this is profit and loss problem. According to the formula of "total number of people distributed = total profit and loss ÷ difference between two distributions", a * * * is calculated, and there are four people.
Formula: (5+3) ÷ (4-2) = 4.
Math diary, Wang Xinran.
Math diary annals
-Be careful with the taxi.
I spent this summer vacation in Beijing. On a sunny Sunday, my parents took me to see a large-scale fairy tale puppet show-Andersen's trip.
Walking on the road, my mother said, "China Children's Art Theatre is too far from our home. We can't walk to the show. Don't mention me if we leave. Even you smart people will break your legs when you get there. " "
Dad said, "Let's take a taxi."
Mom immediately said, "It's 30 kilometers from here to China Children's Art Theatre. The starting price of a taxi is 10 yuan, including 3 kilometers. In the future, it will be a round trip to 2 yuan every kilometer, but if it exceeds 15km, the fare will be increased by 50%. That is to say, after 15km, the unit price per kilometer will change from 2 yuan to 3 yuan, and it is too expensive to take a taxi to 80 yuan.
I immediately had an idea: "Don't you want to save money? Then let's calculate it in another way. If we get off at 15 km, don't we have to pay more? "
Dad nodded approvingly and asked, "How much can this save?"
I did a mental calculation and said, "The money for taking a taxi once or twice is: 30-3=27km, 27- 15-3= 15km, 15*3=45 yuan, 45+ 10=55 yuan. But if we get off at 15km and take two taxis, the money for taking two taxis is: 30/2= 15km, 15-3= 12km, 12*2=24 yuan, 24+.
Dad said happily, "Well, Bao Xiao, thanks to your idea, get off and reward an ice cream!" " "
My mother said enviously, "Bao Xiao, it seems that I have to learn math from you in the future!" " "
I said modestly, "Nothing! Just use your head more! "
This is really a happy Sunday!
Math diary annals
-Be careful when buying clothes.
Today, when my mother finished washing clothes and was about to leave the bathroom, she accidentally hung a hole by the faucet. I was sad to see my mother's tattered clothes. I leaned over and said, "If the old one doesn't go, the new one won't come." Come on, let's buy new clothes. "As he spoke, he took his mother to the door. Mother had no choice but to take me to buy new clothes.
"Which big shopping mall are we going to?" I asked curiously.
"Let's go to the nearby Hualian Shopping Mall and have a look. I heard that there have been activities recently. "
Seeing the huge poster of Hualian Shopping Mall in the distance, my mother said happily, "Look, all the goods here can be bought for 200 minus 20 yuan. Let's go and have a look. "
When I entered the mall, my mother took me directly to the women's section on the fourth floor. She walked around there three times before she saw a black coat embroidered with flowers. The waiter told us that this dress costs 568 yuan, which is two 200 yuan. We can reduce the 40 yuan and pay only 528 yuan. Mom was about to buy, so I took her aside and whispered to her, "Didn't we pass Xidan Shopping Mall when we went to buy books last time?" I saw the poster there saying that all the clothes there were 10% off. It may be cheaper! "
In order to buy more affordable clothes, my mother and I happily went to Xidan shopping mall. Sure enough, the same clothes are sold at 568-56.8=5 1 1.2 yuan after a 10% discount.
After mental arithmetic, I said happily, "528-511= 17 yuan, so * * can save17 yuan in total. It is more economical to discount directly. "
On the way home, my mother wore new clothes and kept praising me for growing up and being careful with my money.
Wang Mathematics Diary
Math diary (1)
My father and I are chatting in the living room. Dad said, "You have learned the age problem. Let me ask you something. I am 35 years old and you are 8 years old now. When will I be four times your age? " I said, "It's a question of age, but it's also a question of difference. You are 27 years older than me, four times older than me and three times older than me. When I was 9 years old, that is, 1 year later, you were four times my age. Right? " Dad nodded and smiled happily.
Math diary (II)
In the morning, my mother and I went downstairs to exercise. Many trees have been planted in front of and behind the building. My mother said let's count the number of trees. I said, okay. Mom said, "Listen, poplars and willows are planted in front of and behind the building. Poplars are planted every 6 meters, 2 1 tree is planted, and willows are planted every 5 meters behind the building. How many willows have been planted? " I thought about it. The number of trees is 2 1, the length of trees is 20,20× 6 = 120m, and the length of willow is 1 20 divided by 5 plus1,which is the number of trees, which is 25. My mother nodded straight.
Xie Mathematics Diary
Sunday, July 6, 2007, 5438+05
Today, my aunt sent me six pieces of clothes, each of which was bought from a specialty store in Shantou, and they were all very expensive! A printed T-shirt 75 yuan, a blue pajamas 88 yuan, a white petticoat 78 yuan, a suspender 55 yuan, a pair of pants 88 yuan, a diagonal shoulder bag 38 yuan, postage 125 yuan!
Let's figure out how much-ah, 547 yuan! Aunt was so kind to me and bought me so many beautiful clothes, and Qian Shan never stopped our relationship!
Sunday, July 6, 2007, 5438+09
Today, I heard that some parts of northwest China are very short of water. Many people in Huining County, Gansu Province only take three baths in their lives, namely, when they are born, when they get married and when they die.
Can you count by yourself? In a year, wash once every two days in spring, 45 times; Wash once a day in summer, * * * 90 times; Wash once every two days in autumn, * * * 45 times; Wash once every three days in winter, 30 times. This year, I took 2 10 baths, 70 times as many as people there. And I am 9 years old this year, taking a bath 1890 times, which is 630 times that of Huining people. Oh! The people who live there are really miserable! When I grow up, I will give them free water once a month so that they can take a good bath every month!
Monday, 27 July 2007
Today, my mother and I went to the bookstore to read books. Mom said, if you have good books, buy them, but if you don't have good books, read them.
Mom has read six books, with an average of 12 yuan. I read 18 books, which is three times that of my mother, but each book is only 6 yuan on average, so the price of each book my mother reads is twice as high as mine.
Mom saved 72 yuan, I saved 108 yuan, and we both saved 180 yuan. Ah, what a savings!
Friday, 27 July 2007
These days, our classmates and parents from Grade Two formed a 28-member tour group to visit Qinhuangdao and Beidaihe. We booked four rooms in a hotel near the seaside, and 28 people need to book seven rooms. Accommodation fee per person per night is 40 yuan, with four people per day 160 yuan and seven people per day 1 120 yuan. We stayed in Beidaihe for three nights, and * * * needed an accommodation fee of 3360 yuan.
Tuesday, 3 1 July 2007
Our family used to rent a house at 550 yuan every month. This holiday, the rent in the community has gone up again, and the landlord gave us a monthly 700 yuan.
In the past, the rent for our family was 6600 yuan a year; Now the annual rent is 8,400 yuan, which is higher than before this year 1800 yuan. It's too expensive!
Saturday, 4 August 2007
I jump rope with my mother. I jump 137 times per minute, my mother jumps 185 times per minute, and my mother jumps 48 times more than me. We danced 15 minutes, I danced 2055 times in 15 minutes, and my mother danced 2775 times. The two of us jumped 4830 times in 15 minutes. 15 minutes My mother jumped 720 times more than me. It's amazing!
Wednesday, August 8, 2007
Today, my father, mother and sister and I went to the ancient stone dragon scenic spot to play. My dad drives at an average speed of 60km/h, which is equivalent to 1km/min and * * * open 15min. From this, it can be calculated that the distance from my home to Gushilong Scenic Area is 15km. If the average speed is 2 km/min, you can drive there in 7 minutes and 30 seconds.
Sunday, 6 August 2007 16
I read 12 books during the holiday. From July 12 to August 16 * *, there are 36 days in total, which is exactly three days to read a book. Each book has an average of 120 pages, which means reading an average of 40 pages every day. Sometimes I read about 50 or 30 pages, but most of the time I read about 40 pages.
Monday, 20 August 2007
In the summer vacation, my mother and I traveled to Beidaihe. We spent 1.200 yuan on shopping four days in advance, 1.700 yuan on classmates, 1.700 yuan on Baiyangdian and 1.005 yuan on Gushilong Scenic Area. Oh, too many!
Friday, 24 August 2007
The math oral card has 125 pages, and the score part has 8 pages. I don't need to do this. I want to do 1 17 pages, and the holiday has 55 days. On average, I can do 2 pages a day to complete the oral calculation card. If I write six pages a day, 19 days can finish it, and I can do other homework in 36 days!
Zhao Mathematics Diary
On Friday, August 3, 2007, it was sunny.
Divide watermelons
Today, several students came to my home to do their homework. It was very hot, and the horse said, "I will kill your watermelon." I said, "Yes, but you can't eat this math problem until you get it right." They said, "Good! Ask a question quickly. " "One more piece, one less two pieces. How many people are there? How many watermelons? " As soon as my voice fell, Ma Linlin replied, "Three people, four watermelons." "Correct answer, how did you calculate it?" I asked. "(1+2) ÷ (2- 1) = 3 This is the number of people. 3 × 1+ 1 = 4, and calculate the number of watermelons. " Ma Linlin replied that all the other students were right. Let's share watermelons. Math is really interesting!
There was a rainstorm on Sunday, August 5, 2007.
Today, my father took me to grandma's house. On the way, I played a game with my father. I counted the telephone poles on the roadside, and my father timed them. Dad said start, I started counting, and dad said time was up, so I stopped. I counted 13 telephone poles, and my father timed it for 2 minutes. My father also told me that the distance between every two telephone poles is 20 meters and asked me what the speed was. I replied, "(13- 1) × 20 is the distance we walk, and dividing this distance by 2 minutes is the speed of our cycling. The answer is 120 meters per minute. " Dad praised me: "You calculate so fast, and your little brain is so smart."
I'm so happy! I found math around us.