There is an urgent need for math diary 5 400 words. Don t say anything about buying something Thank

When I was in the third grade, I felt that math was getting harder and harder, and I was a little afraid of exams and exercises. Mom and Dad always encouraged me and said that learning math well was useful and fun, and I was always skeptical at first. At noon on Saturday, I suddenly wanted to eat curry rice, and my dad took me to Le to buy curry.

When I got to the supermarket, my father said to me, "Before I went out, I grabbed a handful of change, and there were 2 1 dimes, can you do the math later, and buy less things, and use up the 2 dimes, okay?" "When I heard that my dad was going to play math games with me, I was immediately interested

Great, just to train my brain! "I looked around the supermarket and finally found the counter selling curry, and it was ...... to look closelyThere are four types of curry on the cabinet shelves, which are mushrooms, beef, chicken, and mushroom beef. Because our family of three likes to eat meat, the mushroom was the first to veto.

Look at ** again, beef and chicken are yuan, and mushroom beef is yuan, which stumped me all at once.

I carefully calculated, 2 packs of mushroom beef can have 6 jiao change, plus 1 pack of beef has 6 jiao change, and the remainder of three packs is exactly 2 jiao, I quickly selected 3 packs of curry and handed it to Dad, who nodded with satisfaction. On the way home, I said to my father, "It turns out that mathematics is used in accounting, and it seems that mathematics is really useful in life!" ”

11 February 2008.

Yin Today I went to eat at the Xiangcun base in Carrefour with my parents, I ate a 10 yuan meal, my father ate an 8 yuan meal, my mother also ate an 8 yuan meal, and we ate a total of 26 yuan of things.

After eating, we went shopping in Carrefour, and bought Yuan's cotton double nine-hole quilt, Yuan's Jianhua blend and sesame oil, CDs, 6 yuan of Xiaoguang fresh cheese, 5 yuan of sewing machine needles, Yuan awls, 1 yuan of sewing thread, 45 yuan of Yili low-fat and high-calcium milk, a total of yuan, my mother gave my aunt yuan, and my aunt found 50 yuan for my mother. After shopping, we went home happily.

Math Shopping Diary.

In the second semester of the second grade, I began to learn the unit of weight, and I also learned to calculate and use coins, and the following is the math diary of the trouble, usually accompanied by the father after school, and the fathers take the children are always different from the mothers, and they let go of everything to let the children participate, which is also what the mother should learn.

On the way from school, my father and I came to Longhai Market, and my father said, "Let's buy five kilograms of eggs, seven yuan a kilogram, how much does it cost?" "I said right away

Thirty-five dollars. Dad was surprised and said, "That's right, that's right!"

We went to the vegetable stall again, and this time I took the initiative to ask the aunt who sold vegetables: "How much is a kilogram of cucumber?" "Three yuan a kilogram.

I said, "I'll give you two kilograms, and I'll give you six dollars." Then we continued to walk forward with the food, and Dad suddenly said:

There is no salt at home, so we have to buy bags of salt. "When we came to the dried vegetable shop, my father gave me two yuan and asked me to buy a kilogram of salt, which was one yuan and six dimes a kilogram, and I took the salt and the four dimes I found and got into the car and walked back. Suddenly I saw a watermelon on the side of the road, and I wanted to eat it, so my dad stopped.

When asked about five yuan a kilogram, we picked a big one, weighing eight kilograms, so heavy! Dad gave me the problem again and asked me to calculate how much it was. I said:

It's so easy! Isn't it forty dollars? ”

Dad spent a lot of money today! It cost a total of eighty-two yuan hexagonal, nearly one hundred yuan.

Today, my mom and I went to the supermarket to buy something. The supermarket is crowded with people and a dazzling array of goods. My mother hurriedly took me to buy the things I needed at home.

Let's buy a watermelon first. This watermelon costs 3 yuan a pound and weighs 4 pounds. Then we came to the meat seller.

The meat sells for 8 yuan a catty, and we bought 3 catties. Later we bought another carton of milk. There are 16 cartons of milk in a carton, and each carton is 3 yuan.

In the end we went to buy cookies and spent 15 yuan. When I was queuing up at the checkout, my mother said to me, "How much do you want to pay?"

I thought about it, watermelon 3 * 4 = 12 yuan, meat 8 * 3 = 24 yuan, milk 16 * 3 = 48 yuan, take 12 plus 48 first, exactly 60 yuan, plus 24 yuan equals 84 yuan, oh, by the way, there are biscuits, 84 + 15 = 99 yuan. I asked my mom to get a $100 bill ready. When we checked out, the salesman aunt counted it, and sure enough, it was 99 yuan, which was the same as my calculation.

Mom complimented me on how smart I was. I said to my mother: Then you will call me next time you buy something!

The harvest of this purchase is really not small. Not only did I know some daily necessities, but I also used the math knowledge I usually learned. It turns out that math is all around us.

When my mother was cooking in the kitchen, she found that the soy sauce was gone, so she told me to go to the supermarket downstairs to buy a bottle, and gave me six empty bottles and two yuan. Appearance.

When I arrived at the store, I first asked how much money these 6 empty bottles could be exchanged, and my aunt took it and said: "There are two empty bottles that cannot be exchanged, and one empty bottle is 1 dime" I calculated 6-2=4, which can be exchanged for 4 dimes. Then I went to look for soy sauce, and saw that there are several varieties of soy sauce, the most expensive one is 8 50 yuan, if I buy the expensive one, I will have 2 yuan plus 0 4 yuan in exchange, that is, (8 50-2 40 = 6 10), no, the money is not enough, for something else, I picked a cheap bottle of 2 50 yuan a bottle, I calculated it (2 50-2 40 = 0 10), it is still not enough, at this time I was anxious like ants on a hot pot - round and round.

My aunt seemed to see my thoughts, and came over and said, "Little sister, take the soy sauce first, and give me the missing 1 dime next time" I quickly said thank you, Auntie. It turns out that mathematics is everywhere in life. I'll have enough money next time I buy something.

This afternoon, my mom and I went to the supermarket to buy something.

When we were about to leave after we had bought what we needed, I saw ham sausages on the shelves, so I asked my mother to buy some ham sausages, and she agreed. But just after walking a few steps, I saw a pack of them on the shelves, the same brand, the same weight, there were 10 sticks in it, each pack of yuan. Do you buy a pack by pack, or buy one by one?

I hesitated. Suddenly, my mind turned, and there was, as long as I compared, I would buy whichever one was worth it. So I started to calculate:

If you buy 10 sticks for retail sales, each with 4 jiao, it is 40 jiao, which is equal to 4 yuan, and the whole package costs yuan, which is 3 cents more, so I decided to buy in bulk. I told my mom about my calculations, and she complimented me on my love of using my brain.

1. You can write a review and reflection of what you have learned in math class that day.

2. You can use the mathematical knowledge you have learned to describe your life in a day (week).

3. You can write about the use of mathematics in your life.

4. You can write about the mathematical phenomena you see and the mathematical problems you think of.

5. You can write stories related to mathematics.

6. You can introduce the mathematical knowledge you see in the book, including interesting mathematics, mathematical stories, mathematical jokes, introductions of mathematicians, how to play mathematical games, etc.! But be careful not to copy, think and organize through your own mind, and be concise in your language.

7. You can write your own ideas for solving a math problem.

8. You can write about your experience and confusion about learning mathematics and learning methods.

9. You can write what you want to say to your teacher.

In short, the content of the math diary is rich and colorful, and the form is also eclectic, students can write about the topics they are interested in, but they should pay attention to their own thinking when writing, to be novel, the text is required to be concise, clear and vivid, do not pay attention to the reality of life around you, and make up the math diary.

Every Qingming Festival, there will be a sea of people on the giant mountain, so some ** have come up with some deceptive tricks to deceive people, such as: like a disc gambling.

The prop is very simple, draw a large circle on a wooden board, and in the center of the large circle is fixed with a nail that can be turned a pointer. The great circle is divided into 24 equal grids, the needles in the grid can be turned, and 1-24 equal numbers are written in the grid, and there is no value in the singular grid, and almost all of the even numbers are valuable.

The gameplay is also very simple, dial the pointer to 1 first, and then you dial the pointer, the pointer begins to rotate, and finally stops in a certain grid, and then press the number of the grid where the pointer is located, and then move the pointer, n-1 grid, n is the number marked on the grid.

It's just a little math game, in fact, no matter which square you dial, you can only lose, not profit. Because when the pointer turns to the odd number grid, the number of squares tossed is odd number-1 = even number, odd number + even number is only equal to the odd number, so it is impossible to turn to the even number grid, you will not get something valuable, if the pointer turns to the even number grid, the number of squares tossed is even number-1 = odd number, odd number + even number = odd number, and you can't get something valuable.

Life is inseparable from mathematics.

In the past, I always thought that learning the knowledge of "finding the least common multiple" was boring, and dealing with problems like "finding the least common multiple of 11 and 12" all day long was really annoying, and I always felt that learning this knowledge was useless in life.

However, one thing changed my perspective. It wasn't that long ago, and my grandfather and I took the bus to the Youth Palace. We took the No. 3 bus, and when we were about to leave, the No. 1 bus happened to depart at the same time as us.

Yes! "Well, listen up, if bus 1 departs every 3 minutes, bus 3 departs every 5 minutes. How many minutes after these two buses can depart at the same time?

After a pause, I said, "Grandpa, you can't answer this question." Grandpa looked at me suspiciously:

Oh, yes? "There is still one condition missing from this question: the starting point of bus No. 1 and bus No. 3 is the same place.

Grandpa listened to my words, suddenly realized that he patted his smart bald head, and said with a smile, "I'm this."'Ph.D. in Mathematics'There are also times when I am confused, and the questions are not rigorous enough, but Xiao Wei thinks about it thoroughly. Grandpa and I laughed happily.

At this time, Grandpa said: "Okay, now let's say it's the same starting point, what method do you use to solve it?" I thought about it and blurted out:

Another 15 minutes. Since 3 and 5 are coprime numbers, finding the least common multiple of the coprime number is equal to the product of these two numbers (3 5 = 15), so 15 is their least common multiple. That is, both buses can depart at the same time in at least another 15 minutes.

Grandpa complimented me: "The answer is correct!" 100 points.

Yes! Listening to my grandfather's words, I happily raised my hands.

From this incident, I learned a truth: mathematics is really ubiquitous in real life.

Today is Mom's birthday. Mom goes to work in the morning and comes back in the evening. Waiting until after 8 o'clock in the evening, my mother returned.

When I was eating the cake, my mother said to me, "Mom is here to test you, and if you answer correctly, you can eat a piece of cake, okay?" I said, "No problem," and started answering.

Mom came up with the first question: Mom is 36 years old this year, you are 10 years old this year, how old is Mom than you? Grandma is 6 times older than you, how old is grandma this year?

I quickly figured out the results, and I said, "Mom is 26 years older than me, and Grandma is 60 years old. Mom smiled and said

Proud, right? "One more question: Xiao Ming is 8 years old this year, and his father is 40 years old, ask in a few years, will his father be twice as old as Xiao Ming?

Now I was stupid, thinking about it, it seems that my cake can't be eaten, and my mother said, "How about it, won't you?" "If I think about it again, I can't think of a cake that I don't eat.

After a while, I thought of a stupid way, I can find out their ages, after a year, Dad and Xiao Ming are a year older, and finally calculated that after 24 years, Dad's age is just 2 times that of Xiao Ming. I told my mother my idea, and my mother said that there was an easier way, and then she told me about it, as long as I subtract Xiao Ming's age from my father's age, it will be Xiao Ming's age in a few years, that is, 32 years old, and then use 32-8=24 years to count the years that have passed. It dawned on me that it could be so simple.

Mom said: I can find my own way to get the result is still good, as a reward for me to eat cake, I feel happy and embarrassed, I can't be proud in the future, children don't learn from me.