Diary of drawing compasses in math class

How time flies! Another day has passed. Did anything or anyone touch us this day? Let's keep a diary together. Before you write, you should consider the content and structure! The following is my diary of drawing compasses in math class for your reference, hoping to help friends in need.

On a fresh morning, I got up early and a new day began. I go to school by bike quickly.

As soon as I walked to the school gate, I found many sixth-grade students shopping in the canteen! I looked at it curiously and carefully. I really don't know. I'm shocked. It turns out that the math teacher assigned an assignment yesterday and went to buy compasses today.

This is terrible. I'm suddenly in a hurry. What should I do? In desperation, I suddenly thought that my mother-in-law's house was not far from school. Why don't I ask her to give me money for emergency? The extreme panic finally relaxed, and I rushed to my mother-in-law's house, but her door was locked. Is there nobody at home? I knocked hard at the door, but no one answered. So I hurried to school by bike. Fortunately, I was not late when I got to the classroom. Helpless, I borrowed from the left and borrowed from the right, but everyone only has one compass. I couldn't help shivering and feeling nervous again.

In class, the math teacher asked the students to draw with compasses. I look around. The teacher seems to have found something unusual and walked towards me. At this critical moment, I suddenly saw that my deskmate couldn't draw, and I had a brainwave: "I didn't bring it. Let me draw it for you. " She readily agreed, and when the teacher came to me, I was drawing seriously with a compass! The class finally got by.

I can, and then I won't be careless. Although I escaped criticism today, I may not be so lucky next time.

In the evening, my brother said he was hungry and wanted to drink milk powder. Seeing my mother washing clothes, I helped my brother make milk powder. But I didn't know how much water and milk powder I needed, so I ran to ask my mother. Mom told me that I need 180 ml of warm water. I asked my mother how many spoonfuls of milk powder she needed. My mother said, "How many spoonfuls of milk powder do you need for 30 ml of warm water, 1 80 ml of warm water? Calculate it! " When I added it, I counted 30: 30+30 = 60, 60+30=90, 90+30= 120, 120+30= 150,150+30. Finally, the sixth 30 adds up to 180. I quickly told my mother that it was six spoonfuls. Mom smiled and said, "That's right, but if you learn multiplication and division, it will be easier to calculate.". 180÷30=6, which can be calculated soon. " It can be that simple!

Mathematics is around us, I want to study it well!

The third happy Saturday is here, and I am working in the shop with my father.

As soon as I arrived at the store, my father got a call from a customer. I wanted to buy a batch of plates and put them on the insulation table. Dad answered the phone and said to me, "Dad tested you today!" " ! The customer wants to buy 4 sets of pots on the heat preservation table. 1 There are 6 sets of pots on the heat preservation table. A * * *, how much do you want? "I think in my mind, 6+6+6 = 24 (a). Dad asked again, "Do you have any other convenient and quick algorithms? "On second thought, I just learned the multiplication formula" 4624 "in the summer vacation, and I soon figured it out, which is the same as the answer to addition. Dad gave me a thumbs-up when he heard the answer. Dad said, "The number of pots in our warehouse is 12. How many boxes do we need to send? " I quickly meditated in my mind that 24- 12- 12 = 0 is exactly two boxes. I quickly said to my father, "Two boxes will do. "Dad smiled happily and invited me to eat ice cream.

It turns out that mathematics is everywhere in our lives.

On Tuesday, my mother and I went to the swimming training class to continue learning swimming. The coach made me swim back and forth ten times.

After swimming, my mother asked me a question: "How many sets of swimming moves do I need to do to swim ten times back and forth?" Mom wants to test my computing ability.

I thought about it. I need to do 16 swimming movements in one round trip (a group of swimming movements includes: kicking twice, 1 breathing, 1 paddling to both sides), so 16 round trips have 10 swimming movements. I thought of two formulas. The first is the continuous addition formula:16+16+16+16+16+16+65438. The second is the multiplication formula: 16x 10= 160.

I answered my mother's question, and I also told her two calculation methods. My mother asked me again, "Which formula do you think is the simplest?" I smiled and replied, "multiplication formula, of course!" Jia Lian made me spend a long time calculating on paper, and my head was dizzy. " My mother gave me a thumbs-up and said, "Great! Mom thought you would only use the most troublesome method to calculate, haha! "

My mother and I both laughed happily.

Today, I play dominoes at home.

Domino has four colors: light green, dark green, orange and yellow. I counted, there are 20 dominoes in each color. I calculated by multiplication that the total * * * is 4x20=80 (pieces). I put the dominoes in the domino train and counted them. I can put 27 dominoes at a time. Every small train will automatically arrange the dominoes in a straight line. I thought: How many times does the small train have to run to finish? So I calculated by addition, 27+27+26=80 (one), and the small train has to go three times to complete. The last small train is less than the first two 1 domino. I knocked three ribs at the same time and found that the group with 26 dominoes won. I thought three groups won at the same time, so I took two, so the total became 26+26+26=78 (one). Then, I knocked down three rows at the same time, and this time three groups won at the same time.

Dominoes are really interesting. I'll play new tricks next time!

In today's math class, xu teacher taught us to make three-dimensional figures with plasticine and toothpicks. Xu teacher asked us to build a prism and a cube according to the three-dimensional figure on the big screen, and then create an interesting three-dimensional figure by xu teacher's method. The children used their rich imagination to come up with all kinds of three-dimensional graphics. Some cuboids need to be made in the next class, some have the same shape as houses, and some have very complicated iron towers, especially Li Yuxin, who made great efforts to build a three-story house. It was not finished until class was over, and her work was praised by the whole class. This interesting math class makes students understand that they can also build complex graphics with the simplest materials and make them ever-changing.

Today's math class is really interesting, and the students are smiling! I hope there will be more and more such classes in the future, which will make our math learning more and more enjoyable!

Today, my good friend Zhou naturally went to read a book. We came to the reading room. There are so many books in the reading room! There are picture books and story books ... we first came to the favorite picture book area. I counted with Zhou Ziran and found that there were 20 books in each line.

At this time, Zhou naturally wanted to test me and said to me, "Do you know how many books there are in the picture book area?" I looked up and counted, and found a * * * with three lines and 20 copies each. Then the picture book area has 20+20+20=60 (this). Zhou Ziran agreed with me after listening to my answer.

So, we read together in the reading room from 1 pm to 2: 30. I read 30 pages of picture books and 28 pages of story books. I read 30+28=58 (pages) for one and a half hours. One hour equals 60 minutes, and half an hour equals 30 minutes, which means I watched 60+30=90 (minutes).

How time flies when reading! Today is really a happy day!

It was sunny this morning, and I went to hangzhou paradise to play with Xia Er's sister.

We went to play the Ferris wheel. Ferris wheel has four carriages: red, yellow, blue and green. Each color has four compartments, and each compartment can accommodate four people. My mother asked me, "How many people can sit in all the yellow cars?" How many people can sit on the whole Ferris wheel? "I quickly replied:" Yellow can seat 16 people, because yellow has four cubicles, and each cubicle can seat 4 people, so it is 4+4+4 = 16 (people). Ferris wheel has four colors, each color is the same, so it is16+16+16+16 = 64 (person). The ferris wheel can seat 64 people. "After answering the question, we got on the Ferris wheel together. Dad also ordered us something delicious. It was really delicious and fun.

After we got off the Ferris wheel, my father told us, "This will be easier when we learn multiplication." I am looking forward to learning multiplication!

In the summer vacation, I learned modern jigsaw puzzles. Tangram1* * has 5 pairs, each pair consists of 7 pieces. Mom asked me how much this * * *? Here's my calculation. Add 7+7+7+7 = 35 in my notebook. Mom told me that I can work it out quickly with the multiplication formula I just learned! I had a brainwave and silently thought about the multiplication formula related to 7. "Five-seven-thirty-five" is the same as my answer. Wow! The original multiplication formula is so convenient. Mom gave me a thumbs-up sign.

Tangram can be spelled in pairs or in pairs, and can be spelled into people, fish, Chinese characters, rockets, boats, animals and so on. As long as you are willing to use your head, you can spell out all kinds of figures. Today, I spelled one by one until I got nine pairs. What I like best is the picture of mother and daughter having fun together. Look! I used a long right-angle board and a big board to spell out my mother's body, just like being held in my arms and laughing together.

Modern puzzles are really interesting. Let's play together!

Today, my mother taught me to play poker. I don't want a deck of playing cards. J, Q, K are the number zero, A is 1, and everything else remains the same. Everyone put two cards on the table to see who can add, subtract, multiply and divide to get 24. Four cards cannot be reused. My mother showed me several times, and I understood, so we started to play. I can't figure out a lot, but I figured out four such cards, an 8, a 3, a J and an A. I think 3x8x 1+0 = 24. My mother praised me for being smart, and then I answered a question correctly. I thought about it for a long time, and the result was (7+8+9)x 1=24. I quickly figured out the simplest problem, that is, one for 4, one for 6, one for Q, one for J, and 4x6+0+0 = 24. I am having a swell time. My mother said that playing such games can strengthen my oral expression ability, so I should play them often.

Math lesson compass drawing diary article 1 1 On the sixth day of the Lunar New Year, my parents took me to the park in Taicang.

I first went to the ticket booth and bought a ticket for "Luxury Flying Chair". 10 yuan. There are many swing seats around a big pillar. At the beginning of the turn, the outer layer of the big cylinder rises slowly, and the seat rises continuously when turning, and people fly around in the seat. When they flew faster, some people began to scream. But I'm not scared at all. Then we bought three tickets for "Basket sightseeing bus", one for 20 yuan and one for 60 yuan. Finally, my mother and I went to do a "spacewalk", each time 15 yuan, which is 30 yuan. In this case, we spent a total of 10+60+30= 100 yuan.

In the process of playing, I got to know my classmates. He has a package ticket for 40 yuan in his hand. I heard that he can always play eight projects. It suddenly dawned on me that if we had bought the 40 yuan package, we would have paid 100 yuan to play these three games without buying the package, but we only used the 40 yuan package, which was much cheaper than 60 yuan. Alas, what a loss! So I want to tell the children that if you want to save some money when you go here next time, buy a package ticket. This is my suggestion!

Today, my family went to the supermarket to buy things. We first went to the kitchen counter and bought two fresh-keeping bags, one *** 16.8 yuan. My mother asked me 1 how much it costs. I couldn't help saying, "1 8.4 yuan." Then we went to the commodity counter, and we bought three large shoe polishes, one *** 15 yuan. Dad asked me how much is one? I said, "15 yuan divided by 3 equals 5 yuan." Then we went to the toilet paper counter. We bought three packs of toilet paper, 18 yuan. My brother asked me, "1 How much is the toilet paper?" I said confidently, "Six dollars." Then we went to the apple counter and bought 3 Jin of apples, each Jin of 4 yuan. My uncle asked me, "How much is a * * *?" I said without hesitation, "Yes 12 yuan." We finally came to the dental counter and bought two Yunnan Baiyao toothpaste and one from 28 yuan. My mother asked me, "How much are two?" I hesitated and said, "56 yuan."

It turns out that shopping also has math!

Math lesson compass drawing diary article 13 When we were having math class this afternoon, the math teacher suddenly attacked our classmates without prior notice. Let's take a quiz to see if the knowledge we usually learn is solid. She wrote the question on the blackboard, so we copied it down. After copying, start to do the problem. After writing, many children went to the teacher to watch her correct the paper. Seeing that the class was in a mess at this time, the teacher called several children up to take charge of discipline, but it still didn't work. The teacher asked the monitor on duty, one is me and the other is Gao Yuan, to be in charge of discipline, and all the other children went down. We are serious. I stood on the podium to see who was speaking, and then called the roll. Go high and correct him. After our efforts, the classroom was quiet. The teacher announced the score results, and only five students got 100, including me. The teacher added a star to each of the five students.

Through this exam, I summed up my experience: whether I take the exam or not, I must learn my knowledge thoroughly and learn it well.

I met many difficulties in the process of learning "Mathematics". Whenever I encounter difficulties, I always want to give up, but I am curious about mathematics and always want to do the problem well. Difficulties came to me step by step, but I beat them again and again. It's really "where there is a will, there is a way".

What impressed me the most was the area of the circle at that time. At that time, I only knew how to find the area of a circle, but now the two circles are together. I don't know how to find it. I gave up without serious thinking and didn't do my homework well. I thought: I can't go on like this, I have to work hard. Listen carefully to the teacher in class and you will understand at once. I know how to do this problem: the radius of an inner circle is 10 cm, and the radius of an outer circle is 15 cm. What is its area? I first find out the area of the outer circle: 3. 14x 152=706.5 (square centimeter), and then find out the area of the inner circle: 3.14x102 = 314 (square centimeter), so the ring. Hi! It's too simple.

So: anything can be successful as long as you have confidence.

Math lesson compass drawing diary article 15 When my mother was cooking in the kitchen, she found that soy sauce was gone. She asked me to buy a bottle in the supermarket downstairs and gave me six empty bottles and two yuan.

When I got to the store, I first asked how much these six empty bottles could be exchanged. Aunt took a look and said, "There are two empty bottles, one empty bottle 1 min." I calculated that 6-2 = 4 can be changed into 4 cents. Then I went to look for soy sauce and saw that there are several varieties of soy sauce, and the most expensive one is 8. 50 yuan, if it's expensive, I'll add 0 to 2 yuan. 4 yuan is (8. 50—2。 40=6。 10), no. I don't have enough money. I chose another cheap bottle of 2. 50 yuan a bottle, I calculated (2. 50—2。 40=0。 10), still not enough. At this moment, I am anxious like an ant on hot bricks-running around. Aunt seemed to see through my mind and came over and said, "Little sister, take the soy sauce first, and give me the missing 1 next time." I quickly said thank you, aunt.

It turns out that there is mathematics everywhere in life. I will bring enough money when I go shopping next time.

I have a runny nose again. I have been sneezing for a few days. I don't have much room to think of some clothes.

Sure enough, my mother brought me two big sweaters two minutes later and asked me to put them on, but this would greatly slow down my life and affect my frequency!

Let me do the math first. If a coat slows my life down 1/4, and a coat of C is 1/4x 2 = 1/2, and there are 24 hours in a day, then a day will be reduced by 1/2x 24 = 12, and I will be free for two days.

After two days, if you are healthy, your efficiency will increase 1/3, and you can increase 1/3x24 = 8 in one day. It takes 24/8 = 3 days to catch up with the original speed of life. It takes two days to catch up and three days to catch up. From a mathematical point of view, this should be a loss!

So, I showed this series of recipes to my mother, hoping to wear one less. I don't know. She didn't look, so she made me wear two coats. So my efforts just now were not in vain?

Oh, lost again!

On Sunday morning, my grandfather and I went to the lotus pond drugstore and bought two boxes of pills-Weiershu, two boxes of 44 yuan and one box of 22 yuan. Grandpa gave her 50 yuan and the salesman gave her 6 yuan. When I find the money, I add and subtract it with decimals.

Grandpa can also pay like this: 1. Pay the salesman 40 yuan first, and then pay 5 yuan change 1 yuan. 2. If Grandpa has change, he can give it to 40 yuan first and then to 4 yuan. By buying medicine with grandpa this time, I know that mathematics is closely related to our lives.

Another time, my sister and I went to the supermarket to buy things. Bought a pack of beef jerky, a bottle of milk and a bottle of soda, and spent 10 yuan. Zhao Lin bought a box of biscuits and a bottle of soda, which cost 9 yuan money altogether. We gave the shopkeeper 20 yuan money.

The shopkeeper gave us money from 2 yuan. When we were ready to go home, Zhao Lin said, "I want to buy 10 bubble gum." I took out the money and found that the shopkeeper gave me 1 yuan more. Let's go back and find him more 1 yuan. The shopkeeper praised us as honest children, which made us feel very sweet.

Mathematics lesson compass drawing diary 18 Mathematics is everywhere in life and plays an important role in life. Mathematics can be everywhere in life, because it can solve many problems in life. My sister used it on her birthday. At noon on Sunday, my sister came to the hotel on her tenth birthday and saw many people. She invited six classmates, a sister and a brother. I have ten people. Ten of us were alone in a private room, and the cake came up. My sister doesn't know how to distribute it fairly, because she is worried that there will be more people, and everyone will be angry.

At this time, I suggest that ten of us divide the cake into ten equal parts, and each person's share accounts for one tenth of the total cake, which is only fair.

Yes, yes, but what if one tenth of each person is not enough to eat?

Then use other methods. Everyone can cut it as they like, so that no one will have any objection.

In this way, we shared the cake. We ate the cake and were very happy. The birthday party soon ended and everyone went home happily.

Birthday parties let me know how important math is. Only by learning math well can I show myself in front of others.

Today, my mother took me to the "fruit garden" to buy fruit. We bought two cases of apples 120 yuan, one case of kumquat1kloc-0/0 yuan and one case of mango 150 yuan. It's time to pay the money. My mother tested me and said, "Lingshan, do the math. How much does my mother have to pay? " I thought about it and said, "120x2+10+150 = 240+10+150 = 500 (yuan)." Mom smiled and nodded. "Not bad!" The salesman's eyes widened in surprise. After a while, I actually wrote an equation in my mind.

I thought to myself: this time, the equation can help me a lot. When I came home with an average score of helping others, my mother planned to test me again and asked, "Today, we ate half a box of apples!" " "I'm embarrassed, suddenly. The average score jumped out of the math box and said to me, "Miss me, the total number of people = the answer." Say that finish, it disappeared. I thought for a while and said to my mother, "There are 60 apples in a box, and there are 10 people to eat", and 60÷2÷ 10=3 (pieces). Mom, everyone ate three. My math friend helped me a lot today.

One weekend, we had a thinking bubble hall, and I thought for a long time before I came up with a question.

The topic is: Fill the four numbers 0, 2, 4 and 8 in the boxes respectively to form a multiplication formula (0 is not a separate factor). What should I fill in to maximize the product? How to minimize the filling?

In order to maximize the product, I filled in the formula: 804x2, and the teacher criticized me for being wrong. I think, before mom and dad said to put the largest number in front, but I have put the largest number in front! Why is it still wrong? So, I decided to write out all possible formulas and then calculate and verify them. Results The product of 420x8 is the largest and should be filled in the box.

I found that if the product is the largest, the largest number should be multiplied by the hundredth, and if the product is the smallest, the smallest number should be multiplied by the hundredth.

Now the minimum product is required, and 0 cannot be used as a factor alone. Of the three numbers 2, 4 and 8, 2 is the smallest, so 2 is a single factor. The product of 408x2 is the smallest, and that of 420x8 is the largest. This is the correct answer.

Isn't mathematics amazing? When you find the law and solve a math problem, you have a great sense of accomplishment. Mathematics is so amazing!

Math lesson compass drawing diary 2 1 Now I have learned fractional division and gained a lot of knowledge, but there are often some mistakes in my exercise book. Do you believe it? Come and see!

"12 divided by 4 equals?" This topic has long been a cliche, but what about me? It happened that it was written as "12 divided by 4 equals 12 times a quarter equals 3". The teacher not only gave me "good", but also gave me the evaluation of "giving up the easy and seeking the difficult". I'm ashamed to find a hole to get into.

Look! I made another mistake! The final result is "4+2=8 (hours)", which startled the teacher. She jokingly said, "Should I send you to the first grade so that you can learn 4+2?" At this moment, I feel my face is cornered! Of course, this is just a conversation in the office. In the classroom, the teacher left me a little face without saying my name.

Oh, my God! Dad is asking me to change my math homework again, or I will be criticized again! Bye.

Today, I went shopping with my mother and came to a vegetable seller. My mother said to the vegetable seller, "Uncle, come and weigh 2 Jin of vegetables for me."

The vegetable seller said, "Well, 1 kg is 80 cents, and a * * * is ..." Speaking of this, he added, "You are in grade four or five, let you calculate for me how much your mother should give me." I hesitated for a moment. After all, I don't know how many kilograms 1 kg is equal to, which makes me very embarrassed and I have to bite the bullet and agree. At first, I had a brainwave and thought, why don't I stop myself from selling vegetables? I said first, "Grandpa, is X kg =X kg?" Grandpa said without thinking, "Of course." I went on to say, "Then my mother should deal with 1 yuan 60 or 1.6 yuan." After shopping, my mother asked me as she walked, "Daughter, I remember you didn't seem to know 1 kg = 1 kg. How do you calculate it? " I said naughtily, "I won't tell you." Students, do you know how I calculate? By the way, that's what I asked grandpa just now.

Students, there are many interesting math problems in our life. Go find them!