As a style, diary belongs to narrative practical writing. The content of the diary comes from our observation of life. So, you can write notes, people, things, scenery and activities. Everything you do, see, hear and think in a day can be the content of a diary. Diary also refers to a daily notebook or a record of things you encounter and do every day. The following is a collection of math diary 100 words (selected 35 words) in Grade Four that I collected for you. Welcome everyone to learn and refer, I hope it will help you.

Math diary, Grade Four 100 1 This morning, I started the "launching ceremony" of reviewing, practicing and strengthening mathematics according to the "holiday plan" my father asked me to write!

I thought it was a little difficult at first, but it became easier and easier, and I thought math was so interesting! For example:

There is a five-digit number, the lowest digit is 8, the highest digit is 3, one digit is twice the tenth digit, and the sum of the first three digits and the last three digits is 19. What is this five-digit number?

Answer:

First calculate the highest and lowest digits of this five-digit number, then calculate the ten-digit number 8÷2=4, then calculate 8+4 =1219-12 = 7, and finally calculate 3+7 =1019.

I didn't like math before. It was boring. Now I think math is so simple and interesting! You will love math!

Math diary, Grade 4 100 It's sunny today, and my father took me fishing. Dad's fishing rod is 6 meters long, which is 600 centimeters. My fishing rod is relatively short, only 4 meters, which is 400 centimeters.

Dad caught a lot of big fish, which was 35 cm long. And I only caught a few small fish about 10 cm. Although I am not as big as the fish my father caught, I am very happy today!

Math diary 100 Grade Four When I was in Grade Two, my father gave me a question: There are 30 apples, which are divided into five parts on average. How many apples are there in each part?

I thought and thought, thought and thought, but I still couldn't figure it out. Seeing that I thought so hard, my father sighed and said, "Let me make you a condition. This problem needs to be calculated by division Division is actually very simple. You just have to learn multiplication well. " After listening to my father's words, a question immediately appeared in my mind. Five times several equals 30, five times six equals 30. Instead, it was changed to the division formula: 30 divided by 5 equals 6, and each share has 6 apples.

Dad praised me as a clever boy.

Fourth grade math diary 100 On Labor Day, my family went out to eat hot pot. We ordered 2 1 food, * * 120 yuan, drank 6 bottles of beer, each bottle of 4 yuan, drank 1 watermelon juice 25 yuan, and the other expenses were 85 yuan. Dad asked: How much did we spend?

Let me see: 120+6×4+25+85=254 yuan. I said: We always spend 254 yuan. Aunt waiter also sent two small gifts and vouchers from 20 yuan. This year's Dragon Boat Festival, we all had a good time.

Last Saturday, I went to school to participate in interesting math activities in Grade Three. When we got to the delivery room, we sat in the position designated by the teacher. After a while, the class began and the teacher began to lecture. At first, I listened carefully.

However, the more I listened, the less serious I became. In order to do our homework well, the teacher asked us to queue up for approval. When it was my turn, I really made a mistake. Then, I revised the topic and gave it to the teacher for approval. This time, the topic is finally right. Well, I really regret it: I shouldn't be absent-minded in class.

Math diary Grade Four 100 6 One day I was doing my math homework, and a question stumped me. Here comes the problem. There are 860 liters of gasoline. A truck has been used for 20 days and there are still 500 liters left. How many liters of gasoline does it use on average every day? I read the problem five times and worked it out after a while.

This is my job. I subtract how many liters of gasoline from how much oil I have to figure out how many liters of gasoline I use, and then divide how many liters of gasoline I use by the number of days this truck runs to figure out how many liters of gasoline I use on average every day. So I worked out an interesting math problem.

Math diary, Grade Four, 100 Today, my mother and I came to the food market. I bought a lot of vegetables with my friends, such as: I bought two Jin of tomatoes, two yuan each; I bought three Jin of wax gourd, one yuan per Jin; Long beans bought three Jin, two yuan per Jin; I bought two Jin of soybean sprouts, one yuan per Jin. At this moment, my mother asked me a question. Xinxin, you can use your math knowledge to calculate how much it will cost to buy food today. I smiled and told my mother that a * * * costs fifteen dollars. The formula is as follows:

(2x2) (3x1) (3x2) (2x1) =15 (yuan)

Math diary Grade 4 100 8 Today, my mother said that there might be guests coming to our house, so we should prepare something to eat. Mom bought fruit, which is rich in dried fruit. Mom said that two guests were coming and asked me how to divide the apples. I thought about it. There are four people and two guests in my family, one is ***6 people. If you eat six apples, you may not finish them. In that case, it will be wasted. Why don't you cut the apple and eat half? I prepared three big apples, each of which was cut in half with a knife, and three became 1, haha, mom said I was right.

When math diary 100 went to school in the fourth grade, she found that girls were generally shorter than boys, while boys were generally taller than girls; On the physical education class, the teacher asked the short man to stand in front and the tall man to stand behind.

When I cut my nails, I found that my mother's fingers are longer than mine, and my fingers are shorter than my mother's;

When I weighed myself, I found that I was heavier than my brother, who was lighter than me.

When I got a haircut, I found that my mother's hair was longer than my father's, and mine was shorter than my father's. ...

Have you ever made such a discovery in your life? Find it quickly!

Math diary, Grade Four 100 10 found a math problem at home today. I found that a cup of cola is 800g, a cup of green tea is 500g, and a cup of iced black tea is unknown, so I added another message-iced black tea to investigate the math problems around me.

I calculated according to the teacher's method: 800-200 = 600, then 600+500= 1 100, and finally1100+800 =1900, so it's a *. I think there are many math problems in daily life. I hope that children can observe more math problems around them.

Math diary Grade Four 100 Word 1 1 Doing math homework today, there is a problem, 3 1*49=? It suddenly occurred to me that in our math exercise book, there is a method of multiplying the last complement of the first neighbor of two numbers, that is, subtracting 1 from the product of the sum of ten digits of the larger number as the product of thousands and hundreds, and taking 100 as the unit and subtracting the square of the digits of the larger number from ten digits. This question is 4 * 4- 1. 100-9 * 9 = 19,19 as ten digits and one digit, the answer to this question is 15 19, haha! Better do it quickly.

Grade 4 math diary 100 12 Xiao Qiang runs 15 laps around a flower bed with a diameter of 20m every day, while Xiao Qiang runs () km every day?

According to the formula for finding the circle, I quickly figured out that the answer should be 942. Feel good about yourself, put this data in brackets.

After reading it, the teacher only asked me, can I run so far in one day? I paused and suddenly realized.

It is true that mathematics is too closely related to life. Don't forget the reality of life just because you remember mathematics in your calculation. Always remember that mathematics comes from life.

Grade four math diary 100 word 13 20XX year XX month XX day week x weather XX.

Last time, the teacher gave us the mid-term exam in the math workbook. I only got a score of 109, which was deducted from a very simple oral calculation problem. I crossed the math problem vertically on a blank sheet of paper several times and got it right. I copied it wrong when I copied it down. Well, why can't I get rid of my carelessness?

Math diary Grade Four 100 14 This evening, I saw a puzzling math problem. The topic is: 37 students want to cross the river. There is an empty boat at the ferry that can only take five people. How many times do they have to cross the river?

Careless people often ignore the "empty boat", that is, forget to have a gondola, so they can only take four people at a time. In this way, 37 people subtract one rowing classmate, leaving 36 students, 36 divided by 4 equals 9, and the classmate who worked as a boatman on the other side for the last time also landed 4, so it takes at least 9 trips.

Math diary, fourth grade, 100, 15 came across such incredible data in a book today: "A piece of paper with a thickness of 0.0 1 cm is even thicker than Mount Everest after being folded in half for 30 times?"

This data is a bit "absurd" no matter how you listen to it. After all, it is a thin piece of paper. Can folding in half really surpass Everest? But many unexpected things may happen, so only through calculation can we uncover the mystery of all this.

Math diary, Grade 4 100 16 Today, my mother bought me a beautiful box of toothpaste, which also included an adventure chess. There are 1-80 numbers, a dice and four small circles on the chessboard. The rules of the game of chess are: two people roll the dice in turn, advance according to the number of points, and then move the chess according to the requirements of the characters in the circle after reaching the position. The winner is the one who reaches the finish line first.

My mother and I each walked in a small circle. I roll the dice first, and then my mother rolls the dice. One moment my mother retired from 25 to 20, and the other moment I retired from 64 to 78. Mom smiled and said, "You won!" I think this number game is very interesting.

Math diary, Grade 4 100 17 Today, my parents and I got up early, and we are going to have breakfast. Mom and dad let me go shopping on purpose. I bought three rolls, one with 30 cents and three with 90 cents. I also bought two sesame cakes, one for 30 cents and two for 60 cents. I also bought my favorite red bean porridge, one yuan a bowl, and a bowl of wonton, one yuan and fifty cents. I spent four yuan (9jiao+6jiao+1 yuan+1 yuan.5jiao =4 yuan). By buying things, I know that things with the same price are easier to calculate by multiplication than by addition.

Math diary Grade Four 100 Text 18 Today, there was a new lesson in math class-arithmetic of decimal addition and subtraction. I learned how to calculate:

(1) number alignment;

(2) Starting from the low position;

(3) Align the decimal point and point the decimal point.

(4) There is a 0 at the end of the number, which is generally removed.

I also know how to check and compare. Remembering that I didn't study hard before, I regret it now. You may delay, but time will not. Gone forever. Let's cherish time and work hard!

Math diary, Grade 4, 100, 19 This week, we learned the division in the table. I see: when the dividend and divisor are the same and neither is equal to 0, the quotient is 1. I also learned how to ask questions and how to make up my own questions. For example, a small plane can seat 5 people, and there are 40 people in our class. How many small planes should I take? 40÷5=8 (frame), you can shoot 8 frames. It seems that I know a lot! I will continue to work hard and learn more knowledge!

In the fourth grade math diary 100 Word 20 math class, I learned the multiplication formula from 2 to 9 to find the quotient. I also know that it costs 8 yuan to make a small plane. How much does it cost to take a small plane for nine times? Calculate by multiplication. I also know what translation and rotation are: for example; When the fan rotates, it rotates, and when the drawer is opened, it translates. There are still many math problems around us. Let's find them together.

Math diary, Grade Four 100 Word 2 1 Location: Symbol Kingdom.

Characters; =、÷、×、+、-、( )

My name equals a number. Look how neat my two braids are!

My name is organization. Although I am not very good-looking, I am very useful!

X: My name is multiplication sign. I don't look right, but don't write me wrong!

+:My name is plus sign. I look like ten, but I'm not ten, so make it clear!

-:My name is minus, just like one. How beautiful and neat!

Math diary Grade Four 100 Word 22 Today, I have a new math lesson-arithmetic of decimal addition and subtraction. I learned how to calculate: (1) number alignment; (2) Starting from the low position; (3) Align the decimal point and point the decimal point. (4) There is a 0 at the end of the number, which is generally removed. I also know how to check and compare. Remembering that I didn't study hard before, I regret it now. Time waits for no one, and it's gone forever. Let's cherish time and work hard!

Math diary, Grade Four: 100 Today is the second day of the first month, which is a good day for my mother and I to go to my grandmother's house.

In the morning, I got up early and went shopping with my mother to buy three pieces of meat. A piece of meat is 2.5 Jin, and a Jin of meat 16 yuan. My mother handed in 120 yuan. Mom also bought 3 boxes of apples and spent 150 yuan. Going to the wholesale and retail store, my mother bought three more "Want Want Gift Packages" and handed them to 150 yuan. Then we went back to grandma's house happily.

When I arrived at my grandmother's house, my grandmother, uncle, aunt, cousins were all very happy.

After dinner, when we were going home, my uncle, aunt and grandmother all gave me red envelopes. When I got home and opened the red envelope, I was very happy to get eight yuan 100 yuan.

A meaningful day passed quickly!

Math diary in the fourth grade has a holiday 100 words, and the math homework left by Mr. Zhong is to write math diary. I have been thinking about a question: What is math diary? So I asked my mother, and she said, "Let's look for it together."

I woke up in the morning and saw my mother give me some food stamps. She still has two bowls. We were going to buy breakfast in the canteen of my father's unit. My mother said to me, "How about I buy rice and you settle accounts?" I said, "Good!"

When I arrived at the canteen, my mother bought two steamed buns at fifty cents each, plus some porridge and side dishes, totaling two yuan. When I checked out, I gave my uncle who sold rice four food stamps. He smiled and said, "One ticket is enough." Give me back three yuan, and I realized that five yuan is fifty cents. I feel laughed at by others and my face is red.

I know that if I don't learn math well, I will be laughed at all my life and I will be very painful. Mathematics used to be very useful to us.

Math diary, Grade Four 100 Word 25 This morning, I started the "launching ceremony" of reviewing, practicing and strengthening mathematics according to the "holiday plan" my father asked me to write.

At first, I thought it was a little difficult, but the easier it became, the more interesting it was. For example:

There is a five-digit number, the lowest digit is 8, the digit is 3, the digit in the first digit is twice as large as the tenth digit, and the sum of the first three digits and the last three digits is 19. What is this five-digit number?

Answer:

Calculate the digits and the lowest digit first, then the decimal digit 8÷2=4, then 8+4 = 19- 12 = 7, and finally 3+7 =1019-18.

I didn't like math before. It was boring. Now I think mathematics is so simple and interesting. You are sure to like math.

Math diary, Grade Four: 100 On this day, I just finished going to the toilet. When I was flushing, I found that I was still flushing. I thought: What a waste. So I've been thinking about it all day. At this moment, I saw a bottle of iced tea. I can fill the bottle with water and sand (500ml) and put it in the water tank, so that I can take up 500 ml of water, so that I can clean it and save some water resources. This is killing two birds with one stone.

Mathematics is everywhere around us. Math is very good. It can make our thinking very flexible. In the future, I must study math well to enrich our life.

Math diary, Grade 4, 100 Word 27 I like collecting stamps and stamps. Today, I found a math problem from a set of stamps. I have a set of 1978 "steel" stamps. One * * * five dollars, eight cents each. At that time, the value of this set of stamps was 5×8=40 (minutes) =4 cents, exactly 4 cents. Twenty-six years later, this set of stamps is also valuable.

Now, the purchase price of this set of stamps is 16 yuan. 40 times that of that year. The average annual growth rate is 40 ÷ 26 = 1.53 ... (times). If the value of a set of stamps each year is twice that of the previous year, if we sell all our stamps, we will make a fortune!

Math diary, Grade Four: 100 Today, our family came to a strange and beautiful zoo with excitement.

We queued up to buy tickets. I waited a long time before it was my turn, and then I felt impatient. The aunt who bought the ticket smiled and said, "How many people are there, little friend?" "Three." I said brightly. "Children get half a ticket, adults get full tickets to 50 yuan." Aunt said slowly, "Ah. Let me test you, little friend. How much is a * * * "? ""hmm ~ ~ "I said silently," 50 times 2 plus 50 divided by 2 ... oh. 125 yuan. " "How cute." Aunt smiled and said, "Then I will test you again. How many votes did your parents have? " "hee hee. I just learned, simple. " "One fifth." "How clever. What a clever boy. " Aunt praised me. After hearing the praise, I began to like math slowly.

Grade four math diary 100 word 29 1 1 Sunday.

Autumn in October, autumn is crisp. My mother and I went to the orange orchard to pick oranges. We came to the orchard and saw oranges smiling at me. We picked many oranges, and we decided to take them to the market to sell. When I came home at night, I asked my mother how much it cost. Mom said: "500 grams of oranges, 1 yuan, I sold 25 kilograms." A * * *, how much did I get? Do the math yourself. " I thought about it and said, "25 kg = 25,000 g, 25,000 ÷ 500 = 50,50×1= 50 (yuan). I earned 50 yuan selling oranges today. " Mom listened, smiled and said, "You are great." I smiled happily.

During the May Day holiday in math diary, my mother and I went to the mall to buy clothes. However, I think the price there is very strange: saying "buy 100, get 100" means we don't need money?

Mother said, "Silly daughter, how can you not use money?"

I said, "Because it says buy 100, get 100, which means 100- 100=0, so no money is needed!"

Mom said, "that's how you calculate." If so, everything in the mall is free, and many guests will come. This mall will lose a lot. "

Mom also said that you only need 50 yuan to buy 100 and get 100, you know?

After listening to my mother's analysis, I still don't understand. Why? It seems that I still have to go to the shopping mall to make a serious investigation or consult Ceng Laoshi to see what she has, because I know there is still a lot of math knowledge I haven't understood yet.

Math diary, Grade 4 100 3 1 Our study is rectangular, 7 meters long and 4 meters wide, facing south.

As soon as I entered the door, I faced a big purple desk, which was also rectangular, about 2.5 meters long and 1.2 meters wide. That's my father's desk, and there is a smaller rectangular desk next to it, about 2 meters long and 1 meter wide. My mother often reads books here.

In addition, there is a row of sofas and a coffee table near the wall, and there are air conditioners, water dispensers and bookcases in the corner, which are also rectangular.

Finally, I found that I didn't see a square in our study. How strange!

This is my study. Welcome children to my home to play.

Math diary, Grade Four, 100 Word 32 Today, my mother watched Lucky 52 on TV. There is a question in it, and the pupils didn't answer the doctor correctly. My mother asked me to do it. The topic is: A monkey carries corn, carrying 12 bags every day and eating 7 bags at night. When can this monkey move 500 bags of corn? A: 99 days. Answer B 100 days. Answer C: 10 1 day.

I think: 12-7 = 5 (bags), that is to say, moving 5 bags every day, then 500÷5= 100 (days).

I'm laughing in my heart. Suddenly, I thought: On the last day, if I move without eating, there will be 500 bags. Then, 1 day should be reduced, so it takes 100- 1 = 99 days. I handed in my paper at my mother's. My mother said, "Congratulations, you got it right. Wow, I ...

Math diary, Grade Four, 100 Word 33 I saw many people write to Hongkong, but there was nothing I could do. ......

On February 4th, we arrived in Hong Kong by train. I went to the supermarket to buy snacks because I was going to play in Ocean Park the next day. We bought bread, drinks and a little fruit, which cost 86 yuan. The exchange rate between HKD and RMB is 0.8094, which means that 1 HKD is approximately equal to 0.8 yuan RMB. Then 86 yuan dollars is 86×0.8=68.8 yuan, and we spent 68.8 yuan on food.

The next day, our family of three went to Ocean Park with my cousin. Before, my mother booked a ticket online, and it was HK$ 225, equivalent to RMB 225×0.8= 180 (RMB), so a ticket was 180.

Math diary, Grade Four 100 Word 34 On this day, I just went to the toilet. When I was flushing, I found that I was still flushing. I thought: What a waste! So I've been thinking about it all day. At this moment, I saw a bottle of iced tea. I can fill the bottle with water and sand (500ml) and put it in the water tank, so that I can take up 500 ml of water, so that I can clean it and save some water resources. This is killing two birds with one stone.

Mathematics is everywhere around us. Math is very good. It can make our thinking very flexible. In the future, I must study math well to enrich our life.

Math diary, fourth grade, 100 word 35 recently likes a card game blackjack.

Blackjack is to draw four cards at a time with a deck of cards, and the king of size does not participate in this game. A= 1, J= 1 1, Q= 12, K= 13, depending on who is faster, you can use all the operation symbols, and the player who calculates 24 first wins, but some cards can't calculate 24.

The game has started. I drew four cards. The first set of cards is 3, 6, 9 and 5. My answer is (3+5)x (9-6)=24, and the second set of cards is 2, J, J, Q.

At first glance, I said two formulas using 2x 12=24, 2xQxJ/J=24 and 2xQ+(J-J)=24.

Playing 2 1 point can improve our mental arithmetic ability, and we can try it if we want.

;