When we finished buying what we needed, we were about to leave. I saw sausages on the shelf, so I asked my mother to buy some sausages, and my mother agreed. But just after a few steps, I saw a package with the same brand and weight on the shelf, which contained 10 pieces at 4.30 yuan each. Do you want to buy a pack or a slice? I hesitated. Suddenly, my mind turned and I understood. Just compare and see which one is cost-effective. So I started to calculate: if I buy 10 pieces in retail, each piece costs 40 cents, which is equal to 4 yuan, and the whole package costs 4.30 yuan, which is 3 cents more, so I decided to buy it in bulk. I told my mother the process of my calculation, and my mother praised me for my love of brains. 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. Today, my father gave me a task to estimate the number of people in Chen Kai community.
How can I finish this task? You can't let me count them one by one, can you? I've been thinking about it for a long time. If I could know how many houses there are in Chen Kai community, how many families there are in each house and how many people there are in each family, I would come out!
How do I know how many houses there are in Chen Kai community? As I remember, there was a map showing the distribution of communities in Chen Kai. I'll go downstairs and find the distribution map right away. I see that the biggest house number on the distribution map is 16 1. But not all 16 1 buildings are the same height. There are villas, small high-rise buildings and multi-storey apartments. There are three small high-rise buildings, 1 1 floor, each with two house numbers; There are 10 villas with 1 house numbers respectively. The rest are all six-story multi-storey apartments. How many house numbers are there in a multi-storey apartment? It should be calculated as follows:161-3× 2-10×1=145.
Knowing the number and floor of the house, I can calculate the number of households, but how many people should each household count? I assume that there are three people in each household. Total number of villas = 10× 3 = 30 people; The total number of people in small and high floors = 3× 2×11× 2× 3 = 396; Total number of multi-storey apartments: 145× 6× 2× 3 = 5220. So the total number of people in the community is 30+396+5220 = 5646.
I feel very happy after finishing my father's task. I feel quite capable, and it is not easy to count the people living in the community.
One sunny day, my parents took me to buy stationery. When I arrived at Qilu Stationery Store, I saw all kinds of book covers, including Miss Rabbit's, Pleasant Goat's and Big Big Wolf's, and Blue Bear's ... I looked at the price list: 5.00 yuan for small book covers and 6.00 yuan for large book covers, and I immediately took 5 small book covers and 4 large book covers. Walking, I saw a beautiful pencil case, each 6.00 yuan. Mom said, "There are several pencil cases, so I still want to buy them!" " ""just the last one! "I said imploringly." Well, just the last one! ""hmm! " Say that finish, I picked up the pencil case I picked and put it in the basket.
When I got to the cashier, my father said, "Let's calculate first. How much do these cost?" I counted: "5×5+6×4+6, hmm ... 25+24+6=55 yuan!" Mother handed 55 yuan to the shop assistant, and our family went home happily.
Class 3 (4) Wang Jiayi
Count to twenty-four o'clock
1 65438+1October1sunny on Sunday.
Tonight, my mother and I played 24 o'clock and had a good time. There are many algorithms, and some have only one algorithm. For example: "3,7,8,9", its algorithm is: 3× (9-8+7). There are: 6,7, 1, 9, and its algorithm is: (9-6) × (7+ 1). There are some things that we can't figure out at 24: 1 1, 9,13,7; 8, 9, 10, 1 1, we racked our brains and couldn't figure out a way. I'll ask the teacher tomorrow!
This game is full of fun and mystery.
Class 3 (4) Talking about Chen Yi
The Application of Mathematical Relations in Life
Mathematical relations in life are everywhere. Let's use the multiplication relation in mathematics to help Mr. Jin calculate the food expenses that all the students in Class 3 (4) should pay to the school canteen in June 2009.
Mathematical relationship 1: total amount per person = unit price (per meal) x quantity (days)
Total amount per person =6×20= 120 yuan.
Mathematical relationship 2: total amount of the whole class = unit price (total amount per person) x quantity (number of people dining in the whole class)
Total amount of the class = 120×43=5 160 yuan.
Through the above calculation, we know that the school meals paid by all students in June 2009 were 5 1 160 yuan.
Still using the above multiplication relation, we make the following assumptions.
Suppose 1: 1 1, the school organizes students to go out for an autumn outing for one day, and the actual number of meals per person is 19 days (20- 1).
Total amount per person = unit price (per meal) × quantity (per day)
Total amount per person =6× 19= 1 14 yuan.
Total amount of the whole class = unit price (total amount per person) × quantity (number of people dining in the whole class)
Total class amount = 1 14×43=4902 yuan.
Suppose a classmate was hospitalized in February: 1 1, and asked the teacher for a month's leave. The actual number of diners was 42 (43- 1).
Total amount per person = unit price (per meal) × quantity (days)
Total amount per person =6×20= 120 yuan.
Total amount of the whole class = unit price (total amount per person) × quantity (number of people dining in the whole class)
Total class amount = 120×42=5040 yuan.
In real life, mathematical relations include addition, subtraction, multiplication and division. Therefore, learning math well can help us solve many problems in real life.
Shen, Class 34
At noon today, we eat wonton. Early in the morning, dad bought wonton skin and stuffing. We wrapped 50 wontons, put them in the pot together, and soon they were cooked. I said, "If three people eat, they should share it equally." Then I figured it out: 50 ÷ 3 = 16...2. Dad smiled and said, "Silly boy, you can't be so divided. Think again. " I said, "I'll eat 10 first, and you can share the rest." I figured it out again: (50- 10) ÷ 2 = 20. That's right, mom and dad each eat 20, and I eat 10, just right!
Class 3 (4) Huang Ziqi
1 65438+1October1sunny on Sunday.
Today, my mother and I played gobang. I always lost to my mother at first. Later, I slowly discovered the secret. The secret is: first of all, I must see clearly the purpose of my opponent's pieces, and then try to break my opponent's pieces while connecting my own pieces. I won a few games after I found out the secret, mom. I danced with joy and thought: haha, lost! Mom can only invite dad, so I thought: won't dad lose like mom? I still used the same secret, but my father won a game and I didn't show weakness. I played a few games with my father, and finally I won.
I think you must be diligent and serious to succeed in playing gobang.
Three (4) classes
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!
Class 3 (4) Chen Xiaoru
When I was in the third grade, I felt that mathematics was getting more and more difficult. I was afraid of exams and doing problems. My parents always encourage me to learn math well, which is very useful and interesting. At first, I was always skeptical. I suddenly wanted to eat curry rice at noon on Saturday, and my father took me to Le to buy curry. When I arrived at the supermarket, my father said to me, "Before I went out, I grabbed a handful of change, and there were two 1 cent. Can you calculate it well in the future, buy less things and use this 20 cents? " Hearing that my father wanted to play math games with me, I suddenly became interested and immediately replied, "Great, just to practice my brain!" " "I looked everywhere in the supermarket and finally found the counter selling curry. Careful observation shows that there are four kinds of curries on the shelves, namely mushrooms, beef, chicken and mushroom beef. Because all three of us like meat, we refused mushrooms first. Look at the price, beef and chicken are from 5.6 yuan, and mushroom beef is from 5.8 yuan, which stumped me at once. I calculated carefully that two packs of mushroom beef can have 60 cents change, plus 1 pack of beef has 60 cents change, and the balance of three packs is exactly 20 cents. I quickly selected three packs of curry and handed it to my father, who nodded with satisfaction. On the way home, I said to my father, "It turns out that mathematics is used in accounting. It seems that mathematics is really useful in life! " "
I believe I will!
Zhou Yiwen, Class 4, Grade 3.
A good way to save time
June 6, 2009 +65438 sunny.
Today is the wedding of my uncle's son, Uncle Yu Yong. My mother took me to the seagull building for a wedding reception. My heart is full of joy.
Early in the morning, my mother said at home, "We are going to the barber shop to wash our hair and cars today. It takes a lot of time, so we have to hurry. " I thought, "How can we save time?" Let me think about it. Isn't the car wash just across from the barber shop? We can drive the car to the store first, then give it to the people in the store, and then we can wash our hair and come back after washing our hair. Wouldn't it save time to do these two things at the same time? I told my mother this method, and as a result, we really saved time.
In the evening, my mother smiled and said to me, "You used your brain today. Think about it. When can I save time in this way? " "When you get up in the morning, you can brush your teeth and wash your face while eating breakfast in the microwave oven; Moreover, when grandma cooks, she can clean up the used bowls first. " I answered my mother in combination with what I saw. "Hey, mom told you, this method is called overall planning method, which is to let several things go together when possible to save time. This is a mathematical method."
I am so happy today, knowing what the overall planning method is, saving time. I hope I can learn math well in the future and apply it to my life to make my life relaxed and comfortable.
Xu Xinyi, Class 3 and Class 4.
65438+1October 3 1 Saturday sunny
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.
Three (4) classes of poplars
1 65438+1October1cloudy to cloudy
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.
Yang Ruotong, Class 4, Grade 3
I went to grandpa's shop to play this morning. When I got there, I saw an uncle coming to buy things. He wants to buy a box of yellow wine, a box of iced tea, two packs of soy sauce and three packs of cigarettes. I took the initiative to say to my grandfather, "Grandpa, you tell me the price of these things, and I'll figure it out." "OK", Grandpa told me the price of these things. "A box of yellow rice wine, 55 yuan, a box of iced tea, 37 yuan, two packs of soy sauce, 2 yuan, three packs of cigarettes, 2 1 yuan, a total of 1 15 yuan 40 points", I thought to myself. My uncle gave me 120 yuan. I thought my grandfather should find 4 yuan's 6 horns, but he found 6 yuan's 1 horns. I was puzzled at that time, but after careful observation, all these doubts were solved. It turned out that this uncle returned five empty bottles of yellow rice wine at 30 cents each, so he gave an extra change of 1 yuan at 50 cents.
Students, this story tells us that we should observe everything carefully and don't forget to calculate the price of returning bottles like me!
Class 3 (8) Yang Zihan
165438+2009 10/cloudy
On Saturday afternoon, my mother took me to the market to buy food. We bought two Jin of cucumbers at the price of 4 yuan per Jin. My mother asked me, "How much is a catty of cucumber?" I quickly replied, "2x4 = 8, so it's eight dollars." Mom smiled and said, "Yes." Then we went to a place that sells aquatic products. My mother bought three Jin of shrimp at a price of 15 yuan. I saw my mother give my boss 50 yuan. I calculated in my mind that 50-3x 15 = 5, so my boss wanted to give my mother 5 yuan. So, I quickly said to my mother: "The boss is looking for you, 5 yuan!" The boss listened and said, "How clever!"
Next time I will go shopping with my mother, because I can do arithmetic when I buy food!
Li Lingyan, Class Two (8)
When I came home from school, my father asked me about my study today as usual. I learned smart arithmetic today. When I do the problem, I should look at the operation symbols first. If there is a negative sign in front and a plus sign behind, I can't add up the last two numbers and do clever arithmetic. That's a trap. I recited what the teacher said in class to my father. Dad said, "Then go and do your homework."
After a while, I finished the math homework assigned by my teacher. When I showed it to my father for inspection, I was still a little smug: "Today's clever calculation is too simple, so it must be no problem. Maybe my father will praise me. " I was just thinking about it when my father said to me with his exercise book, "If you make a mistake, check it yourself." I picked up my exercise book and looked at it carefully. "Alas, I fell into a trap." I'll correct it right away. At this time, my father said to me seriously: "You should not only remember what the teacher said in class, but also use it flexibly, so that the topic will be correct and your grades will be improved." I nodded, thinking that I must remember this sentence from my father.
Three (8) Ban Ma 'an
This afternoon, my parents and I went to the supermarket to buy yogurt. When we arrived at the supermarket, we went straight to the yogurt counter and found that there were many kinds of yogurt there. There is an 8-box yogurt 10.5 yuan, and another one with the same brand 16 boxes 19.7 yuan. Which is cost-effective? I calculated it carefully. If you buy two big boxes of eight boxes, it will be 16 boxes, 10.5×2=2 1 yuan, and a box of 16 will be 19.7 yuan, 21-/kloc-0. We decided to buy 16 boxed yogurt. This is the fun of learning mathematics, which is everywhere in life. I must teach myself to learn math well.
Three (8) classes Luo Yifan
Math diary
Today is Sunday. After finishing my homework, with my mother's permission, I started playing computer games. Now I like Xin Kai. Look at my own vegetable garden. It's bright and beautiful. My fish is fat and the animals are alive and kicking, so I don't want to mention how happy I am. Ha, the vegetable field is ripe, and I am happy to collect vegetables. It's a piece of ganoderma lucidum, but I hesitate to plant something else. My mother is next door. I asked my mother, "What shall I plant again?" Mom smiled and said, "Do the math yourself, don't collect it in the middle of the night." So, I use my hand to index. It's noon 12. Let's plant Ganoderma lucidum for 60 hours. No, it will be harvested at midnight 12. Planting cordyceps sinensis for 64 hours is not good. Harvest at 4 am. Haha, I get it. I planted Saussurea involucrata for 56 hours and harvested it at 8 pm. I can't get it, but my mother can help me. I asked my mother how she was doing. My mother praised me for learning "time" well, and my heart was full of joy. In fact, playing games can also use mathematical knowledge. For example, if you want to raise animals between 6 am and 12 am, you don't have to worry that your animals will be born in the middle of the night and affect your sleep. Haha, isn't it fun? Let's work together to learn math better!
Wusan (8) Class
During the summer vacation, mom and grandma went to the movies together. We went to the cinema ticket office to have a look. Children's ticket: 20 yuan, adult ticket: 30 yuan, parent-child ticket: 40 yuan (one big and one small), senior citizen discount ticket: 20 yuan. "How much do we need for the three of us?" Mom asked. I said, "I am 20, my mother is 30, and my grandmother is 20, so it costs 70 yuan." Mother said, "No, think again." Let me think about it. If I buy a "parent-child ticket", my mother and I only want 40 yuan and my grandmother only want 60 yuan.
Now I know how important it is to learn math well!
Class 3 (8) Ding Zhixin
One day, my parents and I went to the playground. I played the pirate ship first, 2 yuan once, 1 minute, I played it three times, 2x3=6, and I used 6 yuan. This thing is exciting! I'm going to play spinning horse. I'm the only one in 2 yuan. My mother and I both played once. 2x2=4, I used 4 yuan, I have 60 yuan, 6+4= 10, and now I have 50 yuan. I walked to see the zoo, and the time was unlimited. The whole family went to 3 yuan, and 47 yuan was left. Now I'm going to play roller coaster, 5 yuan, 3×5 = 15, 15 yuan, 47- 15=32, and 32 yuan. Go to play bumper cars again-3 yuan, my parents and I went to play. There, three people hit me and I hit you, 3x3=9. We used to go to 9 yuan, leaving 23 yuan. I was a little thirsty and my mother was hungry, so we went to the restaurant and spent 2 1 yuan, leaving 2 yuan, and my mother gave me 2 yuan. Going to the playground is so fun!
Class 3 (8) Xie Xinyu
One day, I was bitten by an unknown bug. Dad took me to the hospital. After seeing the doctor, we will pay for the medicine. I looked at the prescription list: five packs of gauze, one pack of 9 yuan, two "Alesone" ointments and one 12 yuan. I figured it out in my head. Five packs of gauze, one pack of 9 yuan is 5 times 9, which equals 45 yuan, and two "Elosons". It turns out that a small insect bite will lose so much money, which is really unexpected. Through this flexible study, I think I can also use the mathematics knowledge I have learned to calculate and learn to save every penny.
Class 3 (8)
Grandpa went to buy a case of beer to entertain guests today. In the evening, the guests came. Mom and dad took out melon seeds, peanuts and oranges. They sat together, talking and laughing. Dinner is ready, and we all sit around the table. Some adults drink beer, some drink old wine, and all children drink drinks. Everyone ate with relish. After dinner, the guests left. I found that the box of beer that grandpa bought was packed like this, with 6 bottles in each row, a total of 4 rows. I used the formula "4624" to quickly calculate that there are 24 bottles of beer in the whole box, and now there are 18 bottles in the box. The guests drank six bottles of beer altogether. I counted the empty bottles and the result was six.
Class 3 (8) Wang Sizhe
Buy mushrooms
Today, I followed my mother to the market to buy food. Mom said, "I will test you today. Will you buy a dish you like?" My mother gave me 20 yuan to watch my performance. "Make sure the task is completed." I said confidently.
So, I walked and watched, and came to the vegetable area. Seeing the tender and white fresh mushrooms makes my mouth water, because I like mushrooms best. Then buy mushrooms! I asked my aunt who sells vegetables, "Aunt, how much is a catty of mushrooms?" Aunt said: "7 yuan a catty. How much do you want, son? " "Two Jin." I think: If it is two kilograms, it is 274, which is exactly 14 yuan. Aunt should also call me 6 yuan. At this time, the aunt weighed it and said, "Little friend, it doesn't matter if you have one or two pounds." "This ..." How much is two ounces? How much should I give my aunt? While I was thinking, my mother came over. I'm a little embarrassed to see my mother, because I just boasted and now I can't figure it out. My mother told me, "Two Jin is 14 yuan, and two Liang is 1 yuan.40" "Well, that's 15 yuan 40 points." I blurted it out. I gave my aunt who sells vegetables 20 yuan, and my aunt gave me 4.60 yuan. I calculated again, just right, no more, no less.
Through this test, I feel that there are many mysteries of mathematics hidden in our lives, and the ability to learn mathematics is really important. And don't be proud. You should study hard and master more math skills in order to apply what you have learned and solve the problems around you.