Math diary's composition is 400 words.

Seven 400-word compositions by math diary.

The day is finally over. There must be something worth recording. At this time, how can the most critical diary be left? However, I found that I didn't know what to write. The following are seven 400-word math diary compositions I collected, hoping to help you.

Math diary Composition 400 words 1 Saturday afternoon, I finished my homework and had nothing to do, so my mother gave me a question: Do you know the characteristics of multiples of 2? As soon as I heard it, I immediately replied: they are all even numbers. So what are their characteristics? Mom asked again. Their units are all 0, 2, 4, 6 and 8. Mom said, you are really something. Do you know the multiple of 4? Do you know the characteristics? Now you have me stumped.

So, I found some multiples of 4 and found that their units are also 0, 2, 4, 6, 8, so I told my mother this rule. But my mother casually said a number, which overturned my discovery. Mom told me to keep watching, but I couldn't find it left or right. Mom reminded me: Look at the last two digits of these figures. I observed these figures according to the tips my mother gave me, and suddenly it dawned on me.

Do your homework: The original multiple of 4 is characterized by the fact that the last two digits of a number are multiples of 4, and this number is multiples of 4. Then, I found some numbers to try, such as: 437, 37 divided by 4=9 1, according to the law, 437 is not a multiple of 4, and then I divided 437 by 4= 109 1, which conforms to this feature. I found another number, 1024, 24 divided by 4=6. I found that 1024 is a multiple of 4. I verified it again by division: 1024 divided by 4=256, so 1024 is a multiple of 4. I happily told my mother about this discovery, and my mother nodded with satisfaction.

I found this. Students might as well give it a try.

Math diary's composition 400 words 2 It was very cold this morning. I walked into the classroom trembling, took out my thermometer as usual and began to record my temperature.

In a blink of an eye, it's the long-awaited math class again. Yesterday afternoon, we spent a class. At this time, the teacher must read all the papers, and I have to wait for a storm.

Mathematics should be regarded as my' strength'. I often get good grades in exams, but sometimes I don't do well for various reasons, such as I am the most careless. I can't forget the last exam, which left a psychological shadow on me. I was thinking of a figure pushing through the door. Wearing a black casual coat and a dark yellow shirt, he quickly entered the classroom and didn't get distracted. Suddenly, the whole class quieted down and returned to their seats. Yes, he is our math teacher.

I also hurried back to my seat, staring at the test paper in the teacher's hand and pretending to be all ears. After a few minutes, the test paper also returned to our hands.

Sure enough, as I expected, there was another problem that was compared with four-point dereliction of duty because of carelessness. There are many problems. I was short-circuited when 1 suspected that I was doing the problem. At that time, I seriously thought about this question after class and got the correct answer.

After that, I also forgot how the class passed, only knowing that the school would be over soon, and I had another meaningful day.

Math diary composition 400 words 3 Today my mother went down to weigh herself. Her weight is 49.3 kilograms. Her height is neither short nor too high, 162 cm. Mom said, this is a math problem. You can write it on the math problem. I listened to my mother and posted her height and weight. Then, I saw another number, 18.8. I asked my mother what the middle row meant. Mom said it was an index calculated by height and weight, indicating that mom was in normal shape. I finally understand that these three are my mother's indicators.

Many problems in our life can be explained by mathematics. For example, my height is 120 cm, and my brother is 80 cm, so I am 40 cm taller than him. For example, age, grandpa is 62 years old and brother is 2 years old. Grandpa is 60 years older than his brother. For example, the temperature is so low during the Chinese New Year. One day, the lowest was only 5 degrees Celsius, and the highest was only 10 degrees Celsius, shivering with cold. For example, today is Saturday, February 20th, 20xx, and it's 8 o'clock in the evening. For example, in counting rankings, my mother took 10430 steps a day, ranking sixth among friends. There is still a turnover. My brother's bathtub is full of water. After putting my brother in, the water came out. How much water does it take to fill it up after taking my brother out, that is to say, it is the place occupied by my brother after going in. There is also a younger brother who drinks milk from a bottle. How many milliliters are written on the bottle, and which number is reached after the milk is filled, it means how many milliliters of milk there are. My brother drinks 180ml every time. Hee hee. There is so much math in my life that I should study hard.

Today, my father bought a new fish tank. The fish tank is a cuboid. I asked my father why not buy some fish. Dad said: "The new fish tank can only be sterilized, otherwise the fish will be poisoned and die."

Cece, dad will test whether you can calculate the glass area of this fish tank. "I observed the fish tank. It has five sides made of glass, four sides and 1 bottom, in which the areas of the opposite sides are equal. I took a ruler and measured it. There are two sides, length 150 cm and width 70 cm. Their area is (150 * 70 = 10500 cm2,10500 * 2 = 21000 cm2) 265438. There are two sides, 70cm long and 60cm wide, with an area of (70 * 60 = 4,200 cm2, 4200 * 2 = 8400 cm2)8400 cm2. The length of the base is 150 cm, the width is 60 cm, and its area is (150 * 60 = 9000cm 2). The total area of glass is 2 1000+8400+9000 = 38400 square centimeters, that is, 3. 84 square meters. I am happy to say to my father, "I have worked it out, and it is 3." "84 square meters." Dad patted me on the shoulder and said, "Well, I'll give you a hug and keep working hard."

Math diary's composition 400 words 5 Everything in life is inseparable from mathematics. As long as you are good at observation, you will find that mathematics cannot be separated from you. After studying the knowledge of proportion for six years, I deeply realized that mathematics has brought us many benefits.

It's a sunny afternoon. My brother and I have an appointment to meet at 2 o'clock in the forest park, and then we will go to the zoo to play together. After arriving at our destination, we had to buy a map of the park, because this was our first visit to the zoo in Forest Park. After I got the map, my brother crept up to me and grabbed it. I have no choice but to restrain my unreasonable behavior towards this "little naughty boy" Then my brother solemnly said to me, "Brother, today my guide will take you to see the lion!" " "At this time, I thought to myself: I hope it won't be the opposite!

Then my brother took me everywhere like a headless fly. After about an hour, I finally couldn't help it. I shouted, "What are you doing? I'm exhausted. Why haven't I arrived yet? " I took the map back directly, and it suddenly dawned on me at first glance that it was my pushy brother who made up figures and interpreted the scale of the map as 1: 5000 as 1 cm representing the actual 5000 cm. "Well, learning a skill is really important! If you are as self-righteous as your younger brother and don't study hard, the consequences are often self-defeating! " Then, according to what I learned, soon, we came to the lion. Look at my brother's envy. He's begging me to accept him as an apprentice!

Knowledge is the key to success, students, study hard! Let's create a better tomorrow with our own efforts!

Math diary composition 400 words 6 Today, I went to the supermarket. My mother bought me a suit and asked me how to pay. Clothes are 298 yuan, 20% off, pants are 10% off in 98 yuan, shoes are 60% off in 230 yuan?

Clothes: 464. 6 yuan

Buy a dress, trousers and shoes. 6 yuan money

Eat dumplings

At noon today, my mother cooked jiaozi, and I ate nine jiaozi. My mother ate jiaozi twice less, and my father ate jiaozi four times more. Mom asked me: How many jiaozi did Mom and Dad eat respectively?

Jiaozi eaten by mom: 9X2-2 =16 (pieces)

Jiaozi eaten by dad: 9X2+4 = 22 (block).

Help mom buy food:

Mother gave me 20 yuan money to buy vegetables and garlic today. 5 yuan is a catty, and vegetables are 2. 5 yuan a catty, pork ribs 14 yuan a catty, I bought 6 liang of garlic, 1 catty of vegetables and 1 catty of pork ribs. My mother asked me if I had enough money, so I calculated: garlic 3. A kilo of 5 yuan, one or two is 35.5 points, six points is 1 minute of 2 yuan, a kilo of vegetables is 50 points of 2 yuan, and ribs are 14 yuan, which adds up to *** 18 yuan and 0 yuan 60 points.

This morning, my father gave me money from 20 yuan to buy breakfast, 65438 steamed buns+two steamed buns with 50 cents from 0 yuan, a cup of soybean milk with 65438 and 50 cents from 0 yuan, and bought 65438 steamed buns and five cups of soybean milk. Dad asked me if I had enough, so I calculated, 1. There are two steamed stuffed buns in 5 yuan, four for three yuan, eight for six yuan and ten for seven. 5 yuan, soybean milk 1 yuan 50 cents a cup, two 3 yuan cups, four 6 yuan cups and five 7 yuan cups 50 cents. The money for steamed stuffed bun and soybean milk is *** 15 yuan. I told dad I bought it, and there were five dollars left. My father said that the rest of the money would reward my work. I am very happy.

Math diary's composition is 400 words. Uncle Chen agreed that we should go to the Guangzhou restaurant in the bridge to have morning tea. We arrived at the lobby of the restaurant at 8: 30. Wow! The hall was crowded with people and it was very lively, and we immediately joined the lively scene.

Adults seem to have endless topics, but we are hungry and can only order something to eat. We ordered ribs, radish cakes and water chestnut cake ... We had a good time chatting over tea and snacks at home. When I finally checked out, my aunt asked me to count and wanted to test my calculation ability. I just picked up the checkout card and saw that 10 people ate 16 plates of snacks. For the dot 10 yuan, we asked for 3 copies; Midpoint 12 yuan, we asked for 4 copies; The bigger 14 yuan, we asked for two copies; Features 16 yuan, we asked for 4 copies; Vertex 18 yuan, we asked for 2 copies; We ordered 1 copy in 20 yuan. Then my calculation results are as follows: small point 30 yuan, middle point 48 yuan, large point 28 yuan, characteristic 64 yuan, vertex 36 yuan and super point 20 yuan, and one * * * is 226 yuan. Plus we 10 people per coffee table 5 yuan, ***50 yuan. I said loudly that the total bill for morning tea today was * * * 276 yuan.

Later, Uncle menstruation paid the bill, and he really got a lot. Everyone applauded me for being good at math. I smiled happily.

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