Math diary, the fourth grade, the second volume.

Math diary 200 words (25 general articles) in the second volume of Grade Four.

A busy and full day is over. I believe everyone has a lot of experience. It's time to write a summary and keep a diary. Let's refer to how the diary is written. The following is the second volume of math diary's 200 words (25 general articles) compiled by me for the fourth grade, which is for reference only and I hope it will help you.

On Friday, math diary/kloc-0, the second volume of Grade Four, Mr. Jin taught us new mathematics knowledge, that is, vertical calculation of division in tables. The calculation steps are as follows: first, you have to multiply the divisor by a few, which is closest to the dividend, so what is the quotient? Write it on the unit above the dividend. Second, multiply the quotient by the divisor, calculate how much the total is divided, and write it under the dividend. Third, subtract the product of quotient and divisor from the dividend and write the difference below the horizontal line. Fourth, the remainder must be less than the divisor when comparing it with the divisor.

Besides, I will use these things in my daily life!

Teacher's comment: This statement is very clear. It seems that class is very serious!

On Friday afternoon, we arrived at the Hong Kong Science Museum. I saw many computers and haha mirrors ... I looked back and saw many souvenirs, which dazzled me. I bought two compasses here, one is round 8 yuan money and the other is spherical 8 yuan money. I took 45 yuan with me, spent 16 yuan, and left 45- 16 = 29 yuan money.

I am very happy today, because I have these two compasses, and I can tell the direction in the future.

Teacher's comment: The font is correct! Clear organization!

Parents suggested that the diary should have a theme in the future and should be checked after writing.

This week, we learned the vertical form of the division formula.

How to go public? Write the word "factory" first, then write the dividend in the word "factory" and write the divisor to the left of "factory". The calculated number is called "quotient", which is written on the word "factory" and aligned with one digit. When calculating, first multiply and divide the number by quotient, and then subtract the product by dividend to see what the number is. If the final result of their subtraction is not zero, but a number less than the divisor, then this number is the remainder. Division is really interesting!

Teacher's comment: the whole calculation process is well expressed and clear, and the sentences are smooth.

Parental comments: I can understand the content of the new study.

Today, my father and I went to the supermarket.

Dad took me to the street corner where vegetables were sold. We bought 2 Jin of cucumber, 1 Jin of tomato and 2 Jin of my favorite potato. On the way back, my father asked me, "There are just four cucumbers. There are three of us, but my mother went to Jinan. How many do we each eat? "

Recalling the division I learned before, I said, "4÷2=2, everyone eats two." Dad asked again, "These four cucumbers cost 2 3 yuan cents each. How much is each cucumber? " I thought about it and said, "3 yuan's 2 angles are 32 angles, and 32÷4=8, each of which is 8 angles." Dad nodded, smiled and said, "You're right!" Today, I am so happy! I bought my favorite vegetables and learned math knowledge. It's killing two birds with one stone!

Math diary did the homework of 1-9 in the math book today. After finishing, do it for the first time and give it to my mother for signature. My mother said that if I didn't finish it, I would check it and make it up. Second, give it to mom for signature. Mom said, I haven't finished it yet. Check it again and make it up.

Sign my mother's name for the third time. My mother was angry and said loudly that it wasn't over yet. Please check it carefully and make it up. The fourth time, I checked carefully from the first question to make sure there were no missing questions before handing them over to my mother for signature. Fortunately, I finally passed the test. After my mother signed it, she severely criticized me, saying that my heart is thicker than the pier of Jiubao overpass, and I must form the habit of self-checking homework in the future, otherwise I will get good grades in the exam and fail if I am not careful.

Math diary, Chapter 6, Volume II, Grade Four, when I was playing the piano today, my teacher always reminded me to pay attention to the beat.

I'm a little confused. After the teacher explained it to me slowly, I suddenly realized that this is a math problem! The whole note is played in four beats. You have to say four beats "1, 2, 3, 4" silently. Binary notes are half of the whole notes, that is, two beats. When playing, silently count two beats "1, 2". A quarter note is a quarter of a whole note, that is, a beat, which is counted as "1" when played. The eighth note is one-eighth of the whole note, that is, eight-quarters, that is, half a beat, and it is "half 1" when played.

I understand the relationship between the notes, as if I had a math class and there was math everywhere in my life!

Math diary Grade Four Volume 7 Today is my mother's payday. I am very happy because my mother took me to the supermarket and bought 30 small moon cakes.

When I got home, I sat on the sofa with my grandmother, grandfather and mother to watch the Olympic Games replay. Grandma served moon cakes on a plate. Grandpa ate three, mom ate three and I ate three. Mom asked, "How many are left?" I replied, "18 left." Mom then asked, "How did you work it out?" I said, "Let's count 3+3+3 = 12, and then 30- 12 = 18." Mom added, "We just learned the multiplication formula. Can you calculate by multiplication? " I replied, "3×4= 12 (pieces), and then 30- 12 = 18 (pieces)." Mom said, "Is it easier this way?" I feel the same way.

Tomorrow, I will eat moon cakes with my friends and talk about multiplication formula together to see who is the best.

Today, my mother took me to Niuniu's sister's house to play.

When I was playing with my sister, I suddenly found that the tiles on her wall were regular, and I immediately thought that this could be calculated by multiplication. I counted five rows of tiles first. Then I counted, and there were eight in a row. I said, "5×8=40 (block)". At this time, my sister asked me curiously: "Sister, why didn't you add it?" I said, "Because the number of tiles in each row is the same (so is the addition number), you can use multiplication, and you can multiply a few by adding a few." Sister said enviously, "Sister, I also want to grow up, so I will use multiplication."

It turns out that mathematics is around us. How interesting!

One day, I want to drink yogurt. Mom said, "Yes! But you must answer a question and get it right. "

Mom asked, "If the store 1 cup of aloe yogurt costs 2 bottles of iced black tea; A bottle of iced black tea needs 2 bottles of mineral water; A bottle of mineral water 2 yuan, how much is the aloe yogurt and iced black tea? " I didn't expect it at the moment, smart little reader, you know?

My reference answer for young readers:

Iced black tea: 2+2=4 (yuan); 2×2=4 (yuan)

Aloe yogurt: 4+4=8 (yuan); 2+2+2+2=8 (yuan); 2×4=8 (yuan); 4×2=8 (yuan)

I drank my aloe yogurt, smart readers, did you do it right?

Math diary 10, the second volume of Grade Four Yesterday, Teacher Sun asked us to make a measuring instrument of 1 liter, and then use 1 liter to measure where the water level is after a liter of water falls in the washbasin at home. It takes about a few liters of water to fill the washbasin.

When I got home, I took an empty fruit orange bottle and used a disposable paper cup. In class, the teacher said that the ordinary disposable paper cup is 250 ml.

I filled the glass with water and poured the water into the bottle of orange one by one until the fourth time, because 4x250= 1000 (ml), 1 liter = 1000 ml.

The water in the bottle is already 1 liter. Then, I took it to the washbasin and poured it into it. A liter of water just passed the bottom of the basin, and then I poured it several times. The final result is that this washbasin can hold about five liters of water.

In this experiment, I got a preliminary understanding of liters and milliliters.

Math diary 1 1 Not long ago, we learned axisymmetric graphics. I think it's amazing! I found a secret in an exam. For example, in this picture, at first I only saw one axis of symmetry. I accidentally put the test paper on the ground at that time. I bent down to pick it up, but I accidentally saw another axis of symmetry. I am overjoyed! I tried to look at this figure from different angles and found three axes of symmetry!

I know, a figure, as long as you change an angle, will have new discoveries, just like this figure, and finally found several symmetry axes. This is really a good idea! This is the same as the story of painting carambola.

Math diary, Grade Four, Book Two, Chapter 12 Today, I played with my good friends, and we discussed playing a game of "evaluation". She gave me a question. Her question is: "Xiaoling and I went to buy books today. She spent 86 yuan's money, and I spent less than 86 yuan. Can you guess what it is?

Give you three choices (70, 100, 10). "I immediately replied," 70 yuan. " She asked me, "How do you know?" I said, "Because 100 is more than 86, 86 won't work." "So 10 is smaller than 86?" She asked, and I went on to say, "10 is much less than 86. "After listening to my answer, my friend was surprised and asked me," How did you do it so fast? I proudly said to her, "I learned it in math class, and I also learned a lot of other math knowledge? "

Math diary 13 After breakfast and homework on Saturday morning, I went to see my mother make zongzi. I asked my mother, "How much does it cost to wrap these zongzi?" Mom said, "Brown leaves are 6 yuan, glutinous rice is 7 yuan, peanuts are 3 yuan, red beans are 4 yuan, and pork is 5 yuan. Do you calculate a * * *, how much is it?" I thought about it carefully and said to my mother, "A ***25 yuan."

My mother asked me, "How did you do it?" I said, "6+7+3+4+5=25 yuan". I asked my mother how many zongzi she made. My mother told me that she made 50 zongzi. I said happily, "It's really cheap to make 25 yuan with 50 zongzi." My mother praised me for being clever.

Math diary 14, the fourth grade book, today is Sunday, the weather is very good. I finished my homework early in the morning. My parents said they would take me shopping in Shangxiajiu Pedestrian Street. After breakfast, we first take bus No.22 from South China University of Technology Bus Station to Ding Gang, then take subway line 3 from Ding Gang to Tiyu West Road and get off at Changshou Road Station. Soon we came to Shangxiajiu Pedestrian Street. Because the BRT project is in progress, the traffic jam between Ding Gang and Tianhe is very serious. I think we can save a lot of time while driving and have more time to go shopping.

Everyone needs 2 yuan money to go by bus, 2 yuan ×3 people = 3 people in 6 yuan, 3 people in 4 yuan and 3 people in 4 yuan ×3 people = 12 yuan, which is equivalent to spending 2×3+4×3= 18 yuan to go home.

Math diary 15, the second volume of grade four, went to learn dancing tonight because he didn't bring water. So, we are going to the supermarket to buy a bottle of mineral water. Mom usually buys it, so I don't know how much a bottle of water costs.

Mom gave me one yuan, but! Aunt salesgirl said it wasn't enough. A bottle of mineral water costs 4 yuan money. Wow! It is four times more expensive than I expected.

I ran out to ask my mother for money again. My mother gave me ten yuan this time, and I gave it to my assistant aunt.

I calculated it myself, 10 yuan -4 yuan =6 yuan, so the salesgirl's aunt should call me 6 yuan. My calculation is very accurate. My aunt, the shop assistant, gave me 6 yuan money.

I gave the rest of the money to my mother, and she praised me for being great!

On the day of math diary 16, the second volume of the fourth grade, I saw an Olympiad problem in a book, which read: At the moment, there is a bag of seven or two seeds and a bag of half two seeds. If you weigh them (without weight) on the balance, you will divide them into two parts: 4.5 and 3. How to divide it?

I calculated it this way: first divide the seeds of 7 Liang into two parts, and then each part is 3.5 Liang, which has been weighed once. Put a bag of seeds with half a grain at one end of the balance, and then take out 0.5 grain from a 3.5 grain and put it at the other end of the balance, which is also called once. Put two 0.5s on a 3.5-tael balance, and you have 3 taels and 4.5 taels.

Today, my mother took me shopping in the supermarket.

When I arrived at the supermarket, my mother allowed me to choose two toys I like. Wow! There are so many toys on the shelf that I like them all! However, I chose two of my favorite toys: a tank and a transformer. The price of a tank is 42 yuan, and that of a transformer is 5 1 yuan. My mother gave me 100 yuan, and then I gave it to my aunt, the clerk. My aunt asked me how much change I should have. I thought for a moment and said, "100 minus 42 minus 5 1 equals 7 yuan". Aunt praised me for being so smart! Mom smiled happily at the side!

I'm glad to take my beloved toy home!

Math diary 18 Sports Meeting, the second volume of Grade Four, has started. The sports meeting has begun. I only heard the small animals shouting, and soon 9 rabbits, 27 puppies, 36 monkeys, 6 kittens and 34 kangaroos appeared on the sports field, competing for this sports event, regardless of the outcome.

At this time, the elephant on the side made a suggestion and said, "Ask the math questions and decide who will apply for this project." Everyone's interest has come, and some people have suggested: How many kittens are less than puppies? Formula 27-6 = 2 1 (only one), someone suggested: How many rabbits are less than kangaroos? Equation 34-9 = 25 (only), they are all scrambling to ask questions. Finally, kittens run and jump, kangaroos jump and jump, rabbits jump rope and jump, and monkeys run and jump. The animals compete fairly and are very lively.

Math diary 19 My mother took me to travel to Chengde, which is a mountainous area. On the way to the scenic spot, we have to go through many tunnels. My mother asked me, "Can you calculate the length of the tunnel?" I thought about it and said, "As long as we know the speed and the time of passing through the tunnel, we can find out the length of the tunnel, that is, distance = speed × time". After that, I silently looked forward to reaching the next tunnel so that I could try my way.

Walking, it suddenly became dark, "I entered the tunnel", and I began to silently count 180 times in my mind, that is, 180 seconds or so. After three minutes, it cleared up and "got out of the tunnel". At this time, I asked the driver that the speed was 75 km/h, which was 750,000 minutes.

Math diary Chapter 20 This morning, Sunny suddenly said to me, "Jiang Han, I'm going to live today. In the evening, can you come to my house to eat birthday cake? " I said to her, "I have to tell my mother before I can go to your house to eat cake."

When the evening came, I took a bath and quickly picked up the gift and ran to her house. I finally got to her house, and I saw many friends waiting for me there. I gave the gift to Qingqing and said to her, "Happy birthday to you!" " "We play with balloons. Everyone is here. Ouyang Qing's mother turned off the light in the living room and lit the candles on the cake. We sang a birthday song: "Happy birthday to you, wish you …" We all said: "Happy birthday to Qingqing! "Sunny is very happy, so are we.

Math diary 2 1 It's so cold! Today, I went to Repulse Bay in Shan County to soak in hot springs, and swam with my mother, aunt and grandmother.

We went by bus. From Lingbao to Repulse Bay, adults need 9 yuan tickets and children need half tickets. Mom, let me figure out how much it will cost the five of us. Let me count three adult tickets first, and one * * * is 39=27 yuan money; Then calculate the tickets for me and my two children. Children are half-price, that is, 50 4 yuan cents per person. The total number of our tickets is equivalent to 9 yuan money. In the end, the tickets for adults and children were 27+9=36 yuan, and the five of us spent 36 yuan money.

I'm glad I finally got it right.

Math diary, Grade Four, Volume II, Chapter 22 Today, as soon as my father and I finished breakfast, we went to Hongyan Bookstore to buy books.

I will buy books, mainly because my father and I promised to buy books for me on National Day. And the math homework happens to have shopping content. Isn't that killing two birds with one stone? Why did you go back to Hongyan Bookstore? Because there are many books there and they are close to our home.

When I arrived at Hongyan Bookstore, my eyes were blurred. There are The Happy Duck, The Witch, The Monkey Who Wants to Become a Man … However, I have to choose two or three books. Finally, I chose the wheel box honey and the blue-eared rabbit grass, both of which are 15 yuan. Two 15 add up to 30. I almost less than ten seconds, just thought of two ways:

1, you can pay three 10 yuan.

You can exchange 50 yuan for 20 yuan. Dad used the method of 1.

After buying books, we went home happily.

Math diary, the fourth grade book, is very popular this summer. My mother took my cousin and me to the street to buy ice cream. We went to the ice cream wholesale department and bought various flavors of ice cream.

We bought 10, five mung beans, five red beans, one from 0.5 yuan and one from 5 yuan. I chose two red date ice creams, each 1.5 yuan and one 3 yuan. My brother chose three mango ice creams, each 1.5 yuan, give us one. Meanwhile, my mother bought stickers for my cousin and me. I chose two diamond stickers from 4 yuan, one from 2 yuan and one from 6 yuan.

Mother said, "How much did you spend today?" I calculated that a * * * costs 23.5 yuan. Mom praised me! What a bumper harvest today!

Math diary Grade Four Volume 24 Today, I was drawing, and my mother came over and asked me what I was doing. I said, "I'm drawing." Mother said, "Let's play a math game together?" "good!" I said, "How to play?" Mother picked up the crayons and said, "I'll give you four lines of crayons, each with six crayons." I said, "How do you calculate?" I thought it over and came up with the answer.

I said to my mother, "The formula is 4 times 6 equals 24." Mom smiled and said, "You got it right, both right and good." Then I put four lines of crayons, each line has six crayons, but the third line has four crayons. I calculated the problem carefully and got the answer. There are two formulas for this problem. The first formula is multiplication and addition, and the formula is 3 times 6 plus 4 equals 22. The second formula is multiplication and subtraction, and the formula is 4 times 6 minus 2 equals 22. Did I do well?

Chapter 25 of math diary's fourth grade, this morning, my mother asked me to buy her some fruits: two Jin of oranges, one Jin of pears and one pitaya.

So, hand me a piece of 20 yuan, a piece of 10 yuan and two pieces of 5 yuan, and tell me to start. Go to the fruit shop where my mother often goes to choose fruit. I saw the price tag: a catty of oranges is 6.5 yuan, and I bought a catty and a half: 6.5× 1.5=9.8, and pear 3 yuan bought two catties: 3×2=6, and dragon. So when I check out at the fruit shop, it should be 9.8+6+7.5=23.3 yuan.

After paying the price with my sister in the fruit shop, my sister wiped off the change for me. Finally paid 23 yuan. Don't underestimate this 0.3 yuan! Many a mickle makes a mickle, so I left the fruit shop happily.

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