In daily life, everything is inseparable from mathematics, which shows how close mathematics is to us. The following is a model essay on the diary of mathematical stories in life. Welcome to read and learn from it. I hope I can help you.

Diary of a Mathematical Story in Life One day, my mother and I went shopping. Mom went into the supermarket to buy things and let me stand at the place where I paid.

I have nothing to do, just watch the assistant aunt collect money. After reading it, I suddenly found that the money collected by the assistant aunt was 1 yuan, 2 yuan, 5 yuan, 10 yuan, 20 yuan and 50 yuan. I feel very strange: Why isn't RMB from 3 yuan, 4 yuan, 6 yuan, 7 yuan, 8 yuan, 9 yuan or 30 yuan, 40 yuan or 60 yuan? I hurried to ask my mother, who encouraged me to say, Think about it and do the math, mom. I'm sure you can find out the reason yourself. ? I calmed down and thought it over. After a while, I jumped up happily. I see, because as long as you have 1 yuan, 2 yuan and 5 yuan, you can form 3 yuan, 4 yuan, 6 yuan, 7 yuan, 8 yuan and 9 yuan at will, and as long as you have 10 yuan, 20 yuan, 50 yuan, you can also form 30 yuan, 40 yuan and 60 yuan?

Mom nodded straight and asked me another question: Isn't 1 yuan enough if it's just for random combination? Why 5 yuan, 2 yuan? I said? It is inconvenient to use 1 yuan to form a larger number. ? Now my mother shows a satisfied smile and praises me for observing more and thinking more. I am really more comfortable than eating my favorite ice cream.

Here, I also want to tell other children: in fact, there are math problems everywhere in life. As long as you pay more attention to observation and thinking, you will find many unexpected discoveries. Try it if you don't believe me!

I have nothing to do today, and I want to help my aunt buy food. I thought I could finish math diary.

I came to the vegetable market and it was very lively. The noise is very annoying. I immediately bought my favorite chicken leg and couldn't wait to get there. I immediately asked the boss how much it was, and the boss replied. 4.5 yuan one:? I took out 10 yuan and gave it to him. He gave me the money and I left. I ran away without paying attention. When I went shopping, I found that I was 50 cents short, and I was going to change it. I was really confused at that time and immediately went to the place where I bought chicken. I am really careless. Why didn't I notice? The boss is also warm-hearted. He gave me the money without saying anything. I bowed my head in shame and said, thank you? And left.

I went on to buy a lot of things, but it didn't count. I decided to count patiently and finally got it. The result is the answer: 45.3 yuan. Dad gave it to me. Why is there only 4 yuan left in 50 yuan? What should I do? With a loss of 70 cents, what can I say?

As soon as I got home, I came to my father and said, Dad, I'm sorry, I miscalculated the money. Dad smiled and said, it doesn't matter, there are inevitably careless mistakes in life. ? I forgive you this time. Not next time. I heard what to say. Therefore, we should not make careless mistakes in general mathematics. If we make careless mistakes, we will suffer. I won't make mistakes in shopping in the future. Understand the last lesson.

Mathematics Story Diary 3 Mathematics is everywhere in life. Now let's explore the mystery of mathematics together!

A few days ago, we learned to understand equations. This is not! As soon as I got home, my mother began to test me!

Mom opened the math book and asked, A box of ink is X yuan, and a pencil is 1.2 yuan. A box of ink and a pencil-4 yuan, how much is a box of ink?

I answered without thinking:? X+ 1.2=4 solution: x=4- 1.2 X=2.8?

? Good, good. ? Mom said with a smile.

? I haven't checked yet! ? So, I started to check again! :? Substitute x=2.8 into the left side of the original equation =x+ 1.2 =2.8+ 1.2 =4 right =4 left = right, then x=2.8 is the solution of the original equation. ?

? Yo! My daughter is very clever! ? Mom said with a smile. I laughed too.

? I'm testing you! ? Mom smiled mysteriously? A box of ink is X yuan, and three boxes of ink are 8.4 yuan, so how much is a box of ink? A box of ink is X yuan, and three boxes of ink are 8.4 yuan, so how much is a box of ink? What should we do! ? I asked my mother. Mom said:? You little fool, you just praised you, so you can't! Look, it says: X? 3=8.4! ?

? Oh, I remember! x？ 3=8.4 x=8.4？ 3 x=2.8. There is also checking calculation: test: put x=2.8 to the left of the original equation =x? 3 =2.8? 3 =8.4 right =8.4 left = right, then x=2.8 is the solution of the original equation. ?

? 100, depending on your enthusiasm, I'll give you another one: Xiaoming is x years old and his father is 40 years old. The difference between them is 28 years old. How old is Xiaoming this year? It's simple! 28+x=40 x=40-28 x= 13. Check to see if it is correct. ? Mom reminded me. Test: substitute x= 13 into the left side of the equation =28+x =28+ 13 =4 1! Left is not equal to right. Wrong calculation! Wrong calculation! x+28=40 x=40-28 x= 12 .？ You got it right this time! ? Mom gave me a thumbs-up sign! Let me ask you another question: At 8: 00 this morning, the water level of Hongze Lake dam reached 14.5438+04m, which exceeded the warning water level by 0.64m What is the warning water level? Solve by equation. ? I finally figured it out after scratching my head: solution: set the warning water level as xm warning water level+excess = today's water level x+0.64 =14.14x =14-0.64x =13.5 test: put x =/kloc-0. All right! I didn't expect to master new knowledge so firmly! I'll give you another question like this: A faucet in bright primary school is leaking. Xiao Ming carried the bucket for half an hour, and * * * carried 1.8 kg of water. Do you know a faucet that drips water every minute? I replied: Solution: Suppose a dripping hose wastes xkg of water every minute. 30= dripping for half an hour1.8kg =1800g 30x =1800x =1800? 30 x=60 test: How about bringing x=60 into the original equation? Left =30x =30? 60 = 1800 right = 1800 left = right, so x=60 is the solution of the original equation! My daughter has grown up! ? Mom said with a smile.

You see, there is a lot of math around us!

Diary of mathematical stories in life 4. You can meet many math problems in your life. One day, I went shopping with my father and spent 130 yuan. My father wanted to test my ability, so he said to me, Son, suppose 10 yuan stands for A, 20 yuan stands for B, 50 yuan stands for C, and 100 yuan stands for D. How many equations can you list based on this information? I think, A+B+D= 130 yuan, A+B+2C= 130 yuan, A+6B= 130 yuan, 2A+3B+C= 130 yuan, 3a+5b =1. I said:? There are six kinds? . Dad said: I didn't know it was that simple. There are countless kinds. ! I thought for a moment and said: Ah! I only thought of addition and multiplication, not subtraction and division? . Dad said again:? You are wrong, too. Addition and multiplication are more than that. Why don't you go back and think for yourself? !

This time, my dad's question made me understand that when I encounter a problem, I should consider it comprehensively, scrutinize it carefully, and understand the meaning of the problem comprehensively and accurately, otherwise it is easy to ignore another answer and make a mistake of generalizing.

I saw a young man on TV today, buying a meatball string for five dollars. The uncle who sells meatballs set the price of a bunch in 0.5 yuan. He miscalculated the problem in a hurry and made money. He thought he set the price at a string of 1 yuan, only for five young people. As soon as the young man calculated, he said to the meatball seller in a nice voice, you have made a mistake. It should be 10 meatballs. ? The man refused to listen to the change, but he persuaded him and then agreed to give him 1 1 string. The young man said: I will be different if I have one more. If you take it, people should be honest and trustworthy. I can't eat any more. It turned out that math helped me.

I used to, and today's things finally happened. My grandfather took me to the barber shop to wash my hair. The price of shampoo was once in 5 yuan. After washing, the owner of the barber shop was too busy because there were too many customers. My grandfather gave him 10 yuan, but he asked my grandfather for 7 yuan money. My grandfather left without looking at the money, halfway. My grandfather felt in his pocket and found more than 2 yuan's money. My grandfather took me home and went back to get it. I was careless. I'm too busy, there are many people. In these two things, it is very important to be an honest and trustworthy person, and an honest person is blessed by God.

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