Math diary
Today, I packed three large plates of hinges at home, and I counted 68 in one pot. At this time, my father asked me, "If there are six people eating, how much will each person get?" I wrote a formula: 3×68÷6. I thought: First of all, how many hinges does 3×68 have? I calculated vertically, and a * * * is 204. It is very easy to know the total number of hinges and then distribute them to six people equally. 204÷6, the result is 34. I told dad to eat 68 hinges each.
Math diary
Today, my grandmother and I went to the fields to pull out radishes. Grandma said, "There are 15 radishes in the field." I asked, "How much does one weigh?" Grandma said, "About seven or eight taels." Grandma asked, "If a catty of radish costs one yuan, how much can a * * * here be worth?" I calculated that if a radish weighs 8 times, then 15 radishes should weigh 15×8= 120. Grandma said, "10 is two = 1 kg." I said, "Then there are 12 Jin and 65430 Jin here.
Math diary
Today is Friday, and we have a midterm. Among them, there is a topic on the math test paper that I will never forget. The above title is: 8 people row a boat, 5 people can take a big boat, and the rent is 10 yuan; The boat can take three people and rent 6 yuan. Q: How can I rent a boat? How to rent it reasonably and why? My first thought was what the teacher said: "If you encounter such a problem, you should first look at how to rent a seat. Then, calculate how much it will cost? " I worked it out like this: First, a big boat and a small boat can just seat eight people, and then I worked it out to be 16 yuan. Then, I figured out if there was any other way, so I took a look. None of them were reasonable and there were more seats. This means that you should rent a big boat and a small boat.
Math diary
There are two papers in the math midterm exam. One is as big as usual, and the other is only half as big as usual. I was very nervous, but I didn't panic at all during the exam. I read the topic first, and then I began to write. I have great confidence in myself in this midterm. I think I can do well as long as I am serious and not careless. I carefully examine, look at and look up the questions, and I am not careless. Although the exam results haven't come out yet, I believe I can definitely go home with a score of 100, because I promised my mother that I would get a score of 100, and I will keep my word.
Math diary
Students, when we do our homework, we must see the topic clearly. It's not because you are careless that you can't make mistakes. For example, "① The sides of the three bricks are rectangular, with a length of 20 decimeters and a width of 10 decimeter. What's the circumference? (2) The rectangular perimeter of three bricks with a length of 20 decimeters and a width of 10 decimeter? Just a few words, the practice is different. The first problem is (20+ 10)×2=60 (decimeter). The second problem is (20×3+ 10)×2= 140 (decimeter). So we can't be careless when we do our homework.
Math diary
Today, I saw a topic when I grew up with you in math. There are four test questions,100 ÷ 4,200 ÷ 4,300 ÷ 4,400 ÷ 4. The first one is 100÷4, so 100. 400÷4= 100 and 100 are also 25 more than 75. From these questions, we can find that if the dividend is 100, the quotient will be 25 more. Mathematics also has rules.
Math diary
At noon today, my father and I went to Aunt Wang's water hinge shop to eat water hinges. We spent 17 yuan. After dinner, we went home In the afternoon, we took a bath and spent 20 yuan. As soon as we got home from the shower, the phone rang. My father picked up the phone and only heard the person on the phone teaching my father to buy sports shoes with me. Father asked, "Who are you?" "I am Qinchuan's mother." Then hang up. So my father took me to buy sports shoes and spent 45 yuan. He asked: How much did we spend today? I calculated that seventeen plus twenty plus forty-five is seventy-nine yuan. Ah, it cost 79 yuan today.
Grandpa raises pigs
Grandpa raised 10 pigs. Is it enough for a pig to eat three meals a day for 33 days 100 meal? I think 33×3=99 (ton) A:100t is enough. Grandpa asked? If 500 yuan pays 10 for each pig, what is it? I think 10×500=5000 (yuan) A: If 500 yuan gives 10 pigs 5000 yuan. Grandpa asked again? If I have five pigs, pigs eat twice a day. How many meals do five pigs eat? 2×5= 10 (ton), a: five pigs eat 10 ton. Math is really interesting!
Math diary
Today, my grandmother and I went to the fields to pull out radishes. Grandma said, "There are 15 radishes in the field." I asked, how much does one weigh? Grandma said, "About seven or eight taels." Grandma asked: "If a catty of radish costs one yuan, how much can a * * * here be worth?" I calculated that if a radish weighs 8 times, then 15 radishes should be 15×8 = 120 times. Grandma said, "10 Liang = 1 kg." I said, "Then there are 12 Jin and 65440 Jin here.
Math diary
Today, my mother came up to me and said, "I have a question for you to do." There are 85 people going for an autumn outing, and each boat can take 9 people. How many boats do you need? " I thought about it and said, "85 ÷ 9 = 9 ... it takes 4 and 9 ships." Mom said you should think again. I think it should be a 10 boat. Because there are still four people sitting, we need a 10 boat. Mother said, "I can't make the same mistake again." I was thinking, ah! "Mathematics is ever-changing.
Math diary
Today, my relatives came to my house. At lunch, my mother asked me, "How many bowls did we use at noon today?" ? I see a rice bowl for one person, a vegetable bowl for two people and a soup bowl for four people. There are eight people in my family. They quickly say, "8÷ 1=8 (only), 8÷2=4 (only), 8÷4=2 (only), and then use 8+4+2= 14 (only). My mother asked me to have dinner, and I said to my mother, "Next time I want a vegetable bowl and a soup bowl for everyone, then I will talk about hygiene!" " "
Math diary
Today, I clamored to buy samarium thallium, and my aunt agreed, but she wouldn't agree because of her personality. So, she took me to the store and I took a look. Samarium Thallium 10 yuan, Samarium Thallium 4 yuan. Who knows menstruation's original intention is to buy exercise books for his sister? Look at the workbook: "Ah, one 19 yuan!" "Aunt only brought 30 yuan. You can also buy 2×4=8 yuan and 2 small thallium samarium. So, we bought a copy, but the salesman said, "That's just the original price, the current price is 26 yuan. "30-26=4 (yuan) is enough to buy a small thallium samarium. However, 30÷4=7 (pieces) ... 2 (yuan), you could have bought 7 pieces, so there is no way.
Buy a book.
Primary school students' math report is very good. Today, my mother and I read the math newspaper together. Classifying the data, neither my mother nor I understand. The title is: Bill bought a dog with 10 yuan, then sold it with 15 yuan, then bought it with 20 yuan, and finally sold it with 25 yuan. Did Bill finally make money or lose money? How much did you make or lose? We looked at the answer and said that after reading this question, we felt that we had bought and sold, sold and bought, and our thinking was confused in the process of repetition. But if we can classify the quantity according to "buy" and "sell", it will suddenly become clear. (1) Money spent on "buying" twice: 10+20=30 yuan. (2) Money earned from two sales: 15+25=40 (yuan). Obviously Bill made money, earning 40-30= 10 yuan. How rich the knowledge in the math newspaper is!
trade
On the first day of the May Day holiday, my family went to Jiangyong, Hunan. When we arrived at Xiangsui Hotel, which we booked in advance, the waitress told us that the room rate was 198 yuan per day. We need two rooms for two days, so the total is 792 yuan. We thought it was too expensive, so we bargained with her and she agreed to give us a 30% discount. A room like this costs only 140 yuan per day. Later, the waiter's aunt asked us if we wanted an invoice, and we said no,no. The waiter's aunt said that she would give us a discount to 120 yuan. I calculated that 120 times 4 equals 480 yuan, and then 792 minus 480 equals 3 12 yuan. Wow, we saved 3 12 yuan at once! It seems that in order to get benefits, you have to be able to bargain. The accommodation on this trip was really cost-effective, and I also learned to bargain. But what I don't understand is, why can I get a discount without an invoice?