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Math diary 150 words

Time flies like a horse, and a day has passed. There must be something worth recording. At this time, keeping a diary is very necessary. Is it impossible to write without a clue? The following is my collection of 150 words of math diary, hoping to help everyone.

Math diary 150 words1It's sunny on Tuesday, February 7th.

I went to the restaurant to buy a box lunch at noon today, and specially asked for several pairs of disposable chopsticks to prepare for the experiment.

When I got home, I was really excited at the thought of doing the experiment, but I was a little scared. I don't want the first plan to be eliminated as soon as it comes out. In order to verify the correctness of the experimental scheme, I specially measured the length (20cm), thickness (0.35cm) and width (1.6cm and 0.8cm respectively) at both ends of chopsticks. Because disposable chopsticks are similar to trapezoid, I use the formula to calculate the volume of trapezoid to calculate the volume of chopsticks. According to the calculation results, the volume of disposable chopsticks is about 8.4 cubic centimeters. If the results measured in the experiment are similar to those calculated by me, it means that my experiment has been successful, otherwise, I have to find another way. I'm about to start the experiment, but the experimental equipment is not enough, so I can only wait until tomorrow.

Math diary 150 Word 2 It will be fine on Tuesday, February 7th.

Today, my grandmother and I went to the market to buy food. Before we came to the fish stall, my grandmother bought a crucian carp and a 6.6 yuan one. My grandmother gave the buyer 7 yuan first, and then handed it to him 1 cent. I asked strangely, "Why did grandma give him 1 hair?" Grandma said, "Keep reading." I saw the grocer give grandma 50 cents. It suddenly dawned on me that 7-6.6=0.4 (yuan) =4 cents, so it was more troublesome to find 4 cents. But Grandma's method is relatively simple: 7+0. 1-6.6=0.5 yuan =5 cents, so you only need to find 1 50 cents, which is much more convenient in the transaction process.

Mathematics is everywhere in life, so I want to learn it well and apply what I have learned.

Math diary 150 Word 3 It will be fine on Tuesday, February 7th.

My aunt and I are going to Sanshui Lotus World tomorrow. Today, we must decide whether to go by car or with a tour group. For this matter, my aunt and I started a "war of words".

"Drive!" "Go with the group!" "Drive!" "Go with the group!" ..... these two answers are intertwined in my ear. I can't take it anymore. I shouted, "Stop!" Suddenly there was silence. "You can discuss it slowly and have a basis." I said slowly. "Ok, I'll go first." My aunt said, "I am in favor of driving because it saves money." "Isn't it more economical to join the group?" I said. "Really?" My aunt is puzzled. I solemnly said: "Listen, if you go to 59 yuan with the group, there will be four of us, and four 59 is 236 yuan;" If you drive, the tickets will go to 50 yuan. First you have to go to 200 yuan, and then you have to calculate the gas bill. At least there are four people in 50 yuan with one car, so it is 200+50=250 (yuan). Compare the two, 236

In the afternoon, we came to the travel agency to sign up. I hope you have a good time tomorrow!

Math diary 150 Word 4 It will be fine on Tuesday, February 7th.

Today is my birthday. My parents bought many vegetables to celebrate my birthday. "Chef Dad" tied on his bib and started cooking. ...

Stop! Seeing that my father was quickly picking up the oil pan and pouring oil into it, I quickly shouted. Today, the aunt of the neighborhood Committee just issued an oil control bottle. Controlling edible oil can reduce the risk of diseases, especially the possibility of rich diseases. At my strong request, my father had to pour oil into the pot with an oil control bottle. Dad obviously couldn't adapt to cooking with an oil control bottle, so he fried a green vegetable and used nearly 50 grams of oil.

There are three people in my family. How much oil can we use every day if each person's daily intake of edible oil does not exceed 25g?

3×25=75 (g)

Math diary 150 The weather is fine on Tuesday, May 7th.

Hello everyone! I 12 years old, grade five. Today, the weather is sunny. There are seven people in my family who go shopping in the supermarket.

Step into the supermarket door, there is everything inside. I rushed in and carried a basket. First of all, I took three packs of sausages, with 8.5 yuan ***25.5 yuan each, and 1 mints and 1 butterscotch, with an average of 4.5 yuan and 9 yuan per pack. I turned to a wider road, saw a lot of cakes and biscuits, and took three bags, 30 yuan. I bought some articles for daily use, ***30 yuan scored 6.8 points, and bought school supplies, ***50 yuan scored 9.2 points. We went to the cashier and paid 146.438+0 yuan. We went to the vegetable market again and bought tofu from 3 yuan, vegetables and carrots from 0 yuan 1 yuan, onions, chicken legs from 7 yuan, crabs from 28 yuan and cauliflower from 3 yuan ... * * * paid 60 yuan, and finally went to the fruit shop to buy apples from 0 yuan/kloc-0, oranges from 5 yuan 15 yuan.

Ah, it turns out that mathematics knowledge is needed everywhere in life-mathematics is around us!

Math diary 150 Tuesday, February 7th, sunny.

In the afternoon, in the happy classroom, Miss Li played a math trap game with us.

The rule is that students count off in turn after they go. Anyone who quotes a multiple of "3" will have to give a high five. If they violate the above two rules, they will stand in the corner.

The game started, and my heart kept beating. Haha, our group didn't come first, which scared me to death. We are the audience, and the other groups will start first. Miss Li said "Go straight down" until he said "7" and he said "9". Say that finish, the classroom burst into laughter. He walked slowly into the trap.

Until the boy who said "9" wanted to high-five, he said "9", and there was another burst of laughter in the classroom. Later, everyone who fell into the trap was the same. At 18, she also said "18". Miss Li asked her to dance or sing, barking like a dog, and she cried. This is the first time I let her come up, and she cried.

When it was our turn, I quickly counted which one I ranked, which scared me to death, because I ranked "5" and didn't need to high-five. It's my turn I said "5" without thinking. I am not nervous anymore. When I said "3 1", I was nervous again. I said "32" and stood in the corner.

This game is so exciting that I like it very much.

Math diary 150 words Saturday, July 7th is fine.

On Saturday, my mother and I went to our hometown in the country. Along the way, I saw farmers' uncles harvesting sweet potatoes. They smile at the farmer's uncle like fat dolls. My mother told me, "It's sweet potato harvest season", and then she said to herself, "Today, sweet potatoes are rich again." I said, "What's the use of collecting so many sweet potatoes?" Mom said: "Sweet potato can play a great role! Can be made into sweet potato skin, sweet potato powder, sweet potato strips ... "

Knowing that I had learned the percentage, my mother asked me: 50 Jin of sweet potato can squeeze out 5 Jin of sweet potato powder. What is the flour yield of these sweet potatoes? If grandma squeezes 500 Jin of sweet potatoes this year, how much sweet potato powder can grandma collect? I calculated:

5/50× 100%=0. 1× 100%= 10%

500× 10%=50 (kg)

After I finished the calculation, I said to my mother, "The output of sweet potato powder is 10%, and grandma can receive 50 Jin of sweet potato powder this year." I asked my mother curiously, "What does Grandma do with so much sweet potato powder?" Grandma said, "Our special snack in Pingtan-salty rice is indispensable. Our family of three needs 0.4 Jin of sweet potato flour for a salty rice meal. Then grandma gave us 10 Jin, so how many times can we cook salty rice? " I calculated:

10÷0.4=25 (times)

I said to my mother, "I can do it 25 times." Mom said: "Eat salty rice twice a month on average, is it enough for one year?" I said, "I can't finish it yet. I can add another meal during the Chinese New Year. " Mom said, "You are really good. In fact, it can also be made into vermicelli soup, vermicelli and vermicelli knot. "

Math diary 150 Word 8 It will be fine on Tuesday, February 7th.

Today, I did homework No.65438 +0-9 in the math book. 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 150 words will be fine on Tuesday, September 6th.

This winter vacation, I'm going to Beijing to take part in the competition. As time was tight, we decided to go by plane. But the full-price ticket for Urumqi-Beijing flight is 24 10 yuan/ticket, which is too expensive. My father and I decided to order discounted air tickets online. There are many factors that affect the discount of air tickets, such as itinerary, booking time, group booking, off-season, etc. But the most important factor is the booking time. The earlier the discount, the cheaper the price. We decided to book tickets in advance!

Because mom and dad are both members of China Southern Airlines, I used mileage points to exchange air tickets first, but after checking, I found that there was no exchange ticket before 14, so I booked a return ticket for 19 first. Originally, we could change a return ticket from Beijing every 65,438+05,000 kilometers, but with 65,438+0000 kilometers, we can take a high-end economy class, so it's a bit extravagant. We exchanged 48,000 kilometers for three tickets without paying!

After our online search, February 12 is the cheapest, with a 4.5% discount. In this way, the air ticket of our family changed from the full price of 7230 yuan to 3250 yuan. In this way, our round-trip air ticket to Beijing only needs 3250 yuan, which is cheaper than the normal full price 14460 yuan112/0 yuan. What a good deal!

We can reduce the cost through discounts, integral exchange, etc., and we can also use the mathematical operations we have learned, such as addition, subtraction, multiplication and division. Mathematics is really everywhere!

Math diary 150 words10 It will be fine on Tuesday, March 7th.

Today, my mother gave me a profit and loss problem: the rabbit mother appointed a little white rabbit and a little gray rabbit to pick a certain number of mushrooms in a few days. White rabbits plan to collect 80 rabbits every day for the first five days and 60 rabbits every day for the next few days: Grey rabbits plan to collect 100 rabbits every day for the first three days and 70 rabbits every day for the next few days, so that they can rest for two days. How many days will it take the rabbit to finish the task? How many mushrooms do you want each person to pick?

I thought about it and did it: first, I converted the plan of the little white rabbit into 60 yuan a day, and then I chose less: (80-60) × 5 = 100 yuan. Then, I changed my plan of picking 70 rabbits every day, and then I picked more rabbits: 70× 2-( 100-70 )× 3 = 50 (one). Then according to profit and loss problem's formula: number of copies = (profit+loss) ÷ two distribution differences, the tasks to be completed by the rabbit are calculated (100+50) ÷ (70-60) =15 (days). Finally, using profit and loss problem's formula: total quantity = quantity per time × number of copies+surplus, it is concluded that 80× 5+(15-5 )× 60 =1000 (mushrooms) should be selected respectively.

I told my mother my idea of solving the problem. My mother praised me as a clever child, and my heart was full of joy.

Math diary 150 words11It's sunny on Tuesday, February 7th.

The other day, we went to my aunt's house to see my mother-in-law. By the way, school is about to start. Let's get together. Just then, the water stopped. On the day I left, I washed my hands, pressed the switch and left. As a result, I went to my aunt's house, played for a while and came home, and heard the sound of water rushing. I want to turn off the switch. Afterwards, I remembered that I forgot to turn off the switch that day. Since the water came, it has been flowing, flowing, flowing. We went for three days, and it took about 50 to 60 tons a day. So when we start, 60 times 3 equals 180 tons, about one ton of 2 yuan, and 180 tons times 2 yuan equals 360 yuan money. I wasted all 360 yuan in about three days! So sad! Children, you must not waste water like me. There is almost no water on the earth now. Please turn off the switch after washing your hands. Don't waste water!

Math diary 150 words12 On Tuesday, February 7th, the weather was fine.

Happy Saturday came, and my father and I went to work in the shop.

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 figured it out soon, and the answer is the same as that of 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.