Today, my mother said to me, "I am free these two days." Let's go to Beijing and have a look. " So we set off. When I arrived in Beijing, there were people everywhere. Some people are performing dragon dances to celebrate the Olympic Games.
Some people are still selling some Fuwa trinkets. We went anywhere we were busy, but we forgot to find a hotel. It was dark in the blink of an eye, and my mother suddenly remembered to find a hotel. She said to me, "Founder, you are just watching the fun, and you haven't found a hotel yet!" " "
I said, "Oh, I forgot, too. Go! " But we searched for a long time and couldn't find a suitable hotel. Walking past a shop, we approached the waiter and asked him, "Is there a hotel near here with few people?" The waiter said, "Oh, you are looking for a hotel. There is a Peace Hotel along Jianshe Street. Very few people. Where have I just passed? However, there are many hotels in Jianshe Street, so don't get the wrong one. " "Do you know the house number of that hotel?"
I said anxiously. "I only understand that the house number of the Peace Hotel is double digits, and the sum of the two numbers is 6. The product of these two numbers is 9 times the quotient obtained by dividing these two numbers. " I thought about it and said to my aunt, "thank you!" " I dragged my mother to the Peace Hotel. Do you understand how I worked it out? First of all, I think the numbers whose sum of two numbers is 6 are these: 1 and 5, 2 and 4, 3 and 3, 6 and 0. First of all, 1 and 5,1× 5 = 5,5 ÷1= 5, so this does not meet the conditions. Look at 2 and 4, 2×4=8, 4÷2=2, which does not meet the conditions. Then look at 3 and 3, 3×3=9, 3÷3= 1, and the fitting conditions. In the end, 6 and 0, 0×6=0, 6÷0 does not hold water and does not meet the conditions. The answers are only 3 and 3. Sure, the house number is 33. We quickly found the Peace Hotel and spent a sweet night there.
Math diary 500-word encyclopedia in grade six. Today, after learning how to divide decimals by decimals and find divisors by rounding, my father gave me two questions (1). Xiao Li wholesale fruit 13.6 tons. He rented a truck with a load of 4 tons to transport it. How many times does he have to transport it? (2) Wang Xing Clothing Store wants to make clothes, and each set of clothes is made of 2.4 meters of cloth. How many sets of such clothes can 50 meters of cloth make? As soon as I saw the topic, I quickly solved these two problems by rounding: (1) 13.6÷4=3.4 (times) 3.4 times ≈3 times (2)50÷2.4=20.8 (sets) 20.8 sets ≈ 2/kloc-. I quickly told my father the answer, and my father smiled and said to me, is this really the case? I looked at my father doubtfully, then at my own answer, puzzled.
At this time, my father said: when you do the problem, you should think in real life. Is this right? Neither question can be rounded to a rough figure. What about the remaining 0.4 of the first question? Still have to ship again. Is the remaining 0.8 enough for the second question? After listening to it, I suddenly realized that the original problem should be combined with reality, and I couldn't learn the rounding method to form directional thinking. When taking approximate values for cargo transportation, oil loading and other topics. No matter what is after the decimal point, it should be entered in a separate location; When making clothes, furniture and other topics approximate, no matter what is after the decimal point, they don't enter one place.
After I figured it out, I immediately recalculated: 13.6÷4=3.4 times ≈4 times ≈ 50 2.4 = 20.8 sets ≈20 sets. I told my father the result and told him what I thought. My father touched my head and said this. Through the two questions my father gave me, I know that in the process of learning, I can't learn by rote, but should link the learning content in class with real life and use it properly.
Math diary Grade Six 500-word Encyclopedia March 12 Friday sunny.
At noon, my father came back from work, humming a ditty, and happily stepped into the house. I greeted him and asked, "Dad, what's so happy today?" Dad said, "I got a raise this month." I asked, "How much salary do you get now?" Dad thought for a moment, smiled and said, "My salary is higher than your mother's. Our monthly salary adds up to 2800, and the monthly salary difference is 100. How much do you think I get a month? "
After listening to my father's words, I began to draw line drawings on paper to help me understand:
Through observation and thinking, I quickly worked out the answer and told my father. First of all, mother's salary is regarded as the same as father's, so father and mother's monthly salary is yuan, and then the total monthly salary is divided into two parts, 1 part is father's monthly salary. The formula is unitary.
Dad listened and nodded with satisfaction. At this time, my mother, who was cooking, said to me, "Do you have any other methods?" "Is there any other way?" I said in surprise. I stopped to observe and think curiously. I found that the key to this problem is to find out who is the standard. Different standards have different methods. So, I have a second method: taking mom's salary as the standard, assuming that dad and mom have the same salary, then the sum of their monthly salary is yuan, and then divide the sum of their monthly salary into two parts, 1 is mom's monthly salary. Finally, adding 100 yuan more than mom is dad's monthly salary. The column form is meta.
After listening to the second method I introduced, mom and dad both laughed. ...
I like reading the math book written by Grandpa Li Yupei very much. A math commander makes me enjoy it, a math journey to the west makes me memorable, a math zoo makes me fondle admiringly, and the adventures in this math kingdom make me forget all about eating and sleeping.
The protagonist Tintin is very good at mathematics. He was invited to visit the curved kingdom, and his friend Beckham wanted to go, so they came to the curved kingdom together. Here they went to the dangerous math palace, the terrible wildlife park, played interesting math rings and were cheated by "thieves". In this process, Beckham, who is not good at math, encountered many difficulties. While knocking down difficulties, he also fell in love with mathematics and improved his math scores.
I used to think I was good at math, but after reading this book, I felt that I was not good at math, because I couldn't do many math problems in the book, and I didn't understand them thoroughly even after reading the answers and analysis. While slowly understanding these problems, I also learned a lot of knowledge: there are some laws that are difficult to find, binary and decimal systems that make me feel convenient, the golden ratio of people, and pi that makes me feel difficult. Through this book, I have a deep understanding of mathematics and truly realize that mathematics is a delicate and interesting subject.
In life, mathematics is everywhere. When buying food, giving money for money is math; When paper-cutting, the size and area of paper are mathematics; When eating, it is math to distribute food evenly to everyone. I remember when I first bought food, I carefully calculated the accounts while picking the dishes that my parents and I loved, and finally I didn't take the wrong money; At that time, I took money to the supermarket myself, made good use of the money and bought a lot of good things; Let's take a taxi. I found that the driver's uncle asked for an extra dollar by rounding ... it's so convenient to learn math well!
In life, mathematics is really an indispensable good friend. I love math, and I will try to learn it well in the future!
Grade 6 math diary 500-word Encyclopedia 5 65438+1It will rain on Saturday, October 25th.
At noon that day, I was doing math winter vacation homework. Unfortunately, I met a very difficult problem. I thought about it for a long time and didn't come up with one, so later. The problem is this: there is a cuboid, the product of the front and the upper area 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! We only know the area of two faces, and 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, my mother came. My mother taught me to solve the equation first, but I am not very familiar with this method of equation. So, my mother taught me another method: first list the numbers and then exclude them one by one. First of all, we listed many numbers according to the requirements of the topic, such as: 3, 5, 7, 1 1 and so on. And then began to exclude, and then found that only 1 1 and 19. At this time, I thought: one of these two numbers is the common side length of the front and top of the cuboid in the problem; One is the front of a cuboid, and the top is divided by the sum of the lengths of other sides (both 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).
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.
When I was in primary school, math diary wrote that one day I met a practical question that I could answer with my learned mathematics knowledge. Well, most of them are made up. .
Date: Week: Weather:
Title:
In life, we often apply mathematics. For example, we have to calculate money when we go shopping, which is the most realistic. For another example, when we queue up for practice, we should arrange the team reasonably according to the class size. Therefore, there is mathematics everywhere in life!
Today, I saw a round flower bed downstairs, in which many colorful flowers were planted. Some of them are in full bloom, like a bright smiling face, some are half open, like a shy little girl, some are in bud, like an unopened umbrella.
There are three kinds of flowers in the flower bed, magnolia, rose, peony and azalea. There are 400 flowers in a box. The uncle who watered the flowers said that magnolia accounted for 1/4 of all the flowers, roses accounted for 1/3 of the total flowers after magnolia was removed, and peony accounted for 1/2 of the total flowers after magnolia and roses were removed. Finally, it is.
Magnolia grandiflora: 400* 1/4= 100 (flower)
Rose: (400-100) *1/3 =100 (flowers)
Peony: (400-100 * 2) *1/2 =100 (flower)
Rhododendron: 400- 100*3= 100 (flower)
From it, I found that although every answer is the same, the expression is different, the amount of the first unit is different, and the score of each flower is different.
Uncle also said that the radius of this flower bed is 5m, so I did another calculation on the area of the flower bed and got:
S circle =πr2
=3. 14*52 (where 2 stands for square, well, you should know)
=3. 14*25
=78.5 square meters
Today, I found that mathematics is used very frequently in my life, so I must learn it well! (the finishing touch, the teacher's purpose is here, be sure to write! )
At noon today, in order to measure the size of chopsticks more accurately, I asked my father to bring a slender measuring cylinder from the chemistry room. The scale unit is smaller, and each unit is only 1 cubic centimeter. At this point, I seem to feel victory beckoning to me. I really have everything except hands-on experiments.
First of all, I drew a dividing line on disposable chopsticks with a pencil, divided the chopsticks into two sections evenly, and soaked them in water to avoid washing them when measuring. Then, insert the chopsticks into the measuring cylinder, drop water into the measuring cylinder with a dropper, let the water in the measuring cylinder rise to the dividing line of the chopsticks, take the chopsticks out of the measuring cylinder after recording the water level scale (38 ml), and then record the water level scale (34.5 ml) in the measuring cylinder. The difference between the two water level gauges is the volume of this part of chopsticks, which is 3.5 cubic centimeters. In the same way, I measured the volume of the other part of the chopsticks to be 5 cubic centimeters. When the two measurements are added together, the volume of the chopsticks is 8.5 cubic centimeters. When I got the result, I cried excitedly. How proud and proud I am at this time!
Then, according to the situation that each person uses three pairs every day, I calculated the disposable chopsticks consumption of our school (1500 people) and the whole country (1200 million people) for one year, which are 13.96 cubic meters and169000 cubic meters respectively. The result surprised me. What a pity to waste so many wooden disposable chopsticks every year! I hereby appeal to the students at school, no! It is the people of the whole country, and it is not! It should be that everyone in the world should stop using disposable chopsticks. Only in this way can we protect our forest resources, make our earth environment better and let everyone on the earth breathe clean and fresh air.
On Saturday, his mother gave Xiaoming an important task to go to the market to buy fish.
The market is crowded with people. Xiaoming squeezed into the fish area and happened to see Uncle Ma selling fish. Uncle Ma's fish are all live fish, very fresh, so I bought a lot, but there are still some crucian carp left, although not many, but they are all alive and kicking, trying to break free from the shackles of the basin.
Xiao Ming said: uncle horse, I am a frequent visitor here. Sell me all these fish. It is cheaper.
Hearing this, Uncle Ma laughed and said that you can bargain at an early age. Ok, I'll give you a chance! I saw him pick up the scale and weigh it with the basket. He said that this basket of fish used to weigh 28 Jin, but a restaurant bought half of it at one time, and then another customer came to buy the remaining half. Now the basket weighs 14kg. You figure out how many Jin of fish is left, and I'll sell it to you at the lowest price!
Math diary: Xiao Ming is a stubborn person and doesn't give up easily. He began to think: 38kg and 14kg both included the weight of the fish basket, and it can be found that 24kg was sold at 38 14. Then think about it in reverse. Think of the rest of the fish as a portion. There were two before the customer came, so you can know that there were two before the customer came, and the fish bought in that restaurant was two, so there were four fish in the basket, and three were sold.
Thinking of this, Xiao Ming said happily: I have worked it out, and now there are 243=8 (Jin) left in the basket. This fish basket weighs 2 Jin!
Uncle Ma gave a thumbs-up and praised him: Xiaoming is really amazing. Ok, I will honor my promise just now!
Math diary's sixth grade 500-word encyclopedia is sunny on Saturday, May 20th.
Today, my mother gave me a "heavy responsibility"-going to the market to buy fish.
The market is crowded with people. I squeezed into the fish area and happened to see Uncle Ma selling fish. Uncle Ma's fish are all live fish, very fresh, so I bought a lot, but there are still some crucian carp left, although not many, but they are all alive and kicking, trying to break free from the shackles of the basin.
I said, "uncle horse, I am a frequent visitor here. Sell me all these fish. Cheaper. "
Hearing this, Uncle Ma laughed and said, "You can bargain at a young age. Ok, I'll give you a chance! " I saw him pick up the scale and weigh it with the basket. He said, "This basket of fish used to weigh 28 kilograms. A restaurant bought half at a time, and then another customer came to buy the remaining half. Now the basket weighs 14 kg. You calculate how many Jin of fish are left, and I will sell it to you at the lowest price! "
I am a stubborn person and don't give up easily. He began to think: "38kg and 14kg both contain the weight of the fish basket, and 24kg can be sold together with 38- 14. Then think about it in reverse, think of the remaining fish as one, two before the customer came, so that you can know that there were two before the customer came, and the fish bought in that restaurant was two, so the fish in the basket became four, and one sold three. "
Thinking of this, I said happily, "I have worked it out. Now there is 24÷3=8 (kg) left in the basket. This fish basket weighs 2 Jin! "
Uncle Ma gave a thumbs-up and praised: "I am really fine, ok, I will keep my promise just now!"
Math diary 10, a complete collection of 500 words in grade six, I admit that this composition is a bit of luck. Although I only deducted 8 points, I think I should restrain myself by deducting 20 points. I only got 76.5 points in this exam, which is a painful lesson and will become my permanent sober medicine, reminding me to carefully examine the questions, carefully select materials and carefully write. After deep reflection, I summarized the following questions:
1, the topic was not carefully examined. The title of the composition was written in big characters, "The process of learning art", and I just lost my mind and wrote sports activities at this time, so that the article was off topic. It was useless to write it no matter how good it was, and it was not on the blade.
I can't use it. I also wrote a lot of good articles about art this semester, which can be used in the exam, and I will write them after a little change. But when I took the exam, I didn't have a clue in my mind, which fully showed how careless I was in my preparation before the exam. More ironically, after the final exam, I found that my composition on art was published in Youth Daily, which undoubtedly gave me a blow.
3, impetuous before the exam, which directly or indirectly affected my mentality during the exam, as well as my confidence in the composition, pride makes people fall behind.
This semester's composition is in a downhill state. At the beginning of school, the first composition is to read the model essay, and then the sentences are wordy, and the key questions are always missed. Finally, the final exam is off topic, which is a very serious problem. If the college entrance examination is off topic, six years of hard work will be in vain.
Therefore, in the winter vacation, I can't just read the composition, but also study the composition to find out from what aspects the author chooses materials and how to choose them well. This is the biggest problem I am facing at present!
Last time we visited the "percentage" of old friends, this time we will continue to discuss the percentage of "old friends".
Last time, only the "first wisdom gate" of percentage application (1) was discussed, that is, the application of finding the phase difference first and then dividing it by the unit "1"; After that, let's visit the "Second Door of Wisdom". Do you have the courage to accompany me to explore? Come if you have it!
As soon as I entered, I saw a problem that must be understood. For example, the price of an induction cooker in Sunshine Supermarket is 320 yuan, which is cheaper than the original price in 80 yuan. The price of induction cooker has dropped by several percent. Let's explore slowly. Teacher Zhang told us: "This line is a kind of flashback in percentage application. When encountering these problems, we must first complete key sentences. " For example, we add "the price of 20 yuan" before "80 yuan is cheaper than the original price", so that we can explore it better. We can calculate the unit "1" first, the original price is 320+80=400 yuan, and we know the difference (80). Then we divide the first 80 by 400, which equals 20%. We got the key to the second small door, and we continued to open the second small door, only to see a formula "Find a company to know the difference" 65438+. We explored the percentage of "the second door of wisdom" and I learned a lot. Now let's compare.
The first is that we don't know the difference, and the second is that we know the difference; The first is that we know the unit "1", and the second is that we don't know the unit "1". The first one is easy for us to do. We just need to find the difference before and divide it by the unit "1". The second one is more difficult, but we just need to complete the sentence, then find the unit "1" and divide it by the unit "1".
Math diary 500-word Encyclopedia of Grade 612 September 7 Weather: sunny.
Today is my mother's birthday. I decided to DIY a birthday cake for my mother. The shop we are going to is called "homemade at seven" I smelled the smell of scones as soon as I entered the door, and my mouth watered. It takes many steps to make a cake, and an aunt in the shop teaches us step by step. /kloc-prepare the materials at 0/5: 00,/kloc-stir and foam at 0/5: 30, and then bake in the oven for 45 minutes. After that, make the cake embryo first. Next, I made a cake pattern. I chose a cute little tiger, and my sister chose an anime pattern. I first spread all the cake embryos with white cream, then drew a pattern with a toothpick, and then carefully squeezed in different colors of cream, including black, yellow, red and pink. My sister and I have finished eating. Look, how beautiful!
A cake 48 yuan, my sister and I make one. How much does my mother need to pay? 100 yuan enough? How many minutes did it take us to make this cake?
Math diary 500-word Encyclopedia of Grade Six 13 Teachers often say: There is mathematics everywhere in life. In life, at this time, many ordinary little things can be turned into funny and thought-provoking math problems. The math problems we often do are to solve problems in life. No, I found an interesting math problem while eating hamburgers:
It takes three minutes for three people to eat three hamburgers, and how many minutes for nine people to eat nine hamburgers?
My mother often takes my brother and me to eat hamburgers. I only know how to eat. At this time, I never thought I could turn it into a math problem to do. It's really funny to encounter this problem. At first I thought: It takes three minutes for three people to eat three hamburgers. It's not a minute for one person to eat one hamburger, and it's not nine minutes for nine people to eat nine hamburgers. . I was so excited to think about it that I quickly told my mother the answer. But my mother frowned and said, "Son, think about it. Think about how we and my brother eat hamburgers. Use your head more! " "I was shocked, and my pride just disappeared. I calmed down and thought about it. It suddenly occurred to me that it takes three minutes for three people to eat three hamburgers. In fact, it takes three minutes for one person to eat one hamburger and three minutes for nine people to eat nine hamburgers. I didn't tell my mother the answer at once, but I thought it over and over again several times. At this time, I thought there should be no problem before telling my mother the answer. Mother nodded and smiled and praised me as a clever boy. She added, "Mathematics comes from life. As long as you observe carefully, you will get something, just like eating hamburgers. "
Look, a little thing in life can also become a funny math problem. Mathematics is really everywhere! Let's love math and learn it well!
Last time I broke through the "percentage first door", I will continue to visit my friends and knock on the "percentage second door" again.
When I knocked, I found an amiable teacher had a problem: there was once a train with a speed of 80 kilometers per hour. After speeding up, the speed of this train is now112km, which is a few percent of the original speed. This is very simple for the students who broke through the first door last time, that is 1 12. We broke into the first level, and the second level was still the kind and caring teacher. He has a similar problem: once there was a train with a speed of 80 kilometers per hour. After speeding up, the speed of this train increased by 40%. At the moment, the question of how many kilometers the train travels per hour is different from the one we met last time. Let's explore slowly. We know that this question is very similar to the one we learned last semester, so it is very simple for us to explore. There are also two ways. The first method is to find out how many kilometers you have walked per hour than before. 80× 40% = 32km，80+32 = 1 12km； The second is to find out what percentage of the original speed is at the moment. 80×( 1+40%)= 80× 1.4 = 1 12km。 After another pass, the next pass is written by doing these questions: 1. Unit "1"××1%) 2. The fourth level of the unit "1" (unit "1 "× 0%) refers to the general steps of finding the corresponding quantity with the known unit"1":1. Unit'1'was found. 2. Calculate the difference (increase or decrease). 3. Calculate the corresponding quantity. 4. Test and answer.
After our exploration, I gained a lot and further "visited" our friends. In the exploration of mathematics, you will gain a lot and have endless fun.
Math diary1515 6543815 654381 5 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65438 65435 There is a building. How many households are there altogether? How much is included besides the building?
In order to solve the problem, I made a survey and found that the residential area is 200 meters long from north to south and 80 meters wide from east to west, and 200*80= 16000 (meters), so I solved the residential area, which is about 16000 square meters. The second question is the number of households in each building. Take Building 6 where my family lives as an example! The building is 25 stories high, with two units and two households in one unit. The number of households is 25*2*2= 100 (households). There are 100 households in Building 7 and Building 6, and 17 floors in Building 4 and Building 5. Each building should have 17*2*2=64 households. Buildings 1, 2 and 3 are the shortest buildings in the community, and each building has only 1 1*2*2=44 households. The third question just adds up the figures just calculated; 100+100+64+64+44+44 = 460 (households). As the saying goes, although sparrows are small and complete, there are many greening, parking lots, fitness equipment and roads in our community. The greening of the community is as high as 30%, the average building spacing is 40 meters, there are 20 ginkgo trees and 0/5 phoenix trees-there is also a fish pond in the middle of the community, which can relax people. Speaking of which, back to the topic, I calculated that each building covers an average area of 570 meters, and seven buildings add up to 570*7=3990 (square meters). The area excluding buildings should be16000-3990 =12010 (square meters).
Mathematics is really wonderful, and there is still a lot of knowledge waiting for us to explore and discover.