A diary
In our life, there are many math problems to be solved. For example, buy pencils, three boxes or one box Which one should we buy? Now we should use mathematics to calculate that kind of cheapness; When we pay the water bill with dad, we have to use mathematics to calculate how much money we have to pay ... these are all mathematics in our lives. Let me talk about how some of my own problems are solved by mathematics!
Last time, my mother told me a good news: "Angie, I'm going to install a multifunctional desk on the wall of your bedroom and change a small floral curtain for you." I was so happy that I couldn't help humming a ditty: "La la la ……" But after a while, the question came: What is the surface area of the curtain? Haha, I got it. Didn't the teacher teach us to calculate the common factor before calculating the surface area? Hmm! The bedroom is 6 meters long and 3 meters high, so 6? 3-2, 6 is a multiple of 3, so the common factor of 6 and 3 is 3, 3? 3﹦9? Square meters? The surface area of my new curtain has been calculated, and the surface area is 9 square meters. "mom! Mom! I see, so you can customize a 3m for me? 3 meters of curtains! " I ran to my mother happily and told her the answer. My mother was surprised and asked me how I knew. I told my mother about it, and my mother praised me for being great.
There is mathematics everywhere in life, and everything uses mathematics. I love math, and I want to use math to solve difficult problems and make my life full of color!
Two diaries
Mom buys food and pays the bill every day. Today, when I was shopping, I said to my mother, "Mom, we have learned to use money. Let me verify my learning results today! " Mother smiled and nodded.
I saw my mother stop at the place where she bought tomatoes, and I knew she was going to buy tomatoes. I asked my mother in a low voice, "Mom, how many Jin of tomatoes did you buy?" My mother also whispered to me, "Two Jin!" I thought about it, and my brain thought quickly: 2 kg = 1000 g. So, I said to my aunt who sells vegetables, "How much is this tomato?" The aunt who sells vegetables said, "Two and a half dollars, how many pounds do you buy?" I answered her, "Two Jin." When you say it, you think: 2.50+2.50=5 (yuan). I took five yuan from my mother and gave it to my aunt.
My mother took me to the place where chicken wings were sold, knowing that she was going to buy chicken wings. I asked my mother inexplicably, "Mom, how many pounds of chicken wings do you buy?"
Mom said, "Buy two chicken wings and one chicken wing 3.5 yuan." I thought 3.50+3.50=7 (yuan). My mother handed me ten yuan, and I thought about it, knowing that my uncle who sold chicken wings would give me three yuan. I gave the money to my uncle and said, "Buy two chicken wings." Uncle simply said, "All right!" After a while, my uncle really gave me three dollars.
On my way home, I want to know how much money I spent today. So, my little head turned quickly again: from school to the vegetable market next to my home, one person used three pieces, so 3.00+3.00=6 (yuan). It cost five yuan to buy tomatoes. It cost seven yuan to buy chicken wings. 5.00+7.00= 12.00 (yuan). It cost twelve yuan to buy food. 6.00+ 12.00= 18 (yuan). I spent eighteen dollars today.
It's so interesting to apply the knowledge from books to life!
Three diaries
I have been in the fifth grade of primary school and have taken countless math classes. There was a math class that I still remember, and the scene at that time was still vivid.
I remember one day, the math teacher came to give us a math class. We had just learned fractional division at that time, and the teacher gave us several questions about fractional division, just one of which I couldn't do, but the math teacher said, "The classmate I want will come up and do it." I thought, don't point at me, don't point at me. But the teacher just ordered me to go up and do the problems I can't do. My heart is pounding. I can't do that problem. If I do something wrong, I will do it. That's a real pity. I still got up the courage to go to the podium to do the problem. This question is 0.4 16? 0.032, I made a mistake. I added two more zeros. I thought the teacher would criticize me, but as a result, the teacher praised me. The teacher said, "Students, this mistake may be made by the whole class, but I said it this time. I believe everyone will not make this mistake in the future." The teacher said that the three decimal places of 0.032 should be moved three places to the right of 0.4 16, and 0.4 16 becomes 4 16, and 0.032 becomes 32, which is easy to calculate and 4 16? 32, the answer is 13, oh, it's so simple, I finally understand.
I will never forget this math class. If you pass this course, you will definitely not make mistakes when you encounter this kind of math problem in the future.
Four diaries
It's sunny and sunny today. I went shopping with my mother and walked to the door of the community. My mother suddenly asked me, "honey, let me test you." The road ahead is 300 meters long, and there is a street lamp every 10 meter. How many lights are hung on this road? " Mom went on to say, "If you get it right, there will be a gift!" " I said happily, "It's not easy. I have studied wide-angle mathematics and I can tell the answer in 2 minutes. " So, I thought: Tree = total length? Interval length+1, then I'll replace the saplings with lights, that's all. I did the math: 300? 10+ 1 = 3 1 (lamp). After thinking it over, I proudly said to my mother, "A * * has a 3 1 lamp. Baby, you are so smart. It seems that you haven't forgotten what you learned. Mom will take you to buy gifts now, ok? " Mom said happily. Without saying anything, I nodded and said, "Yes, yes, let's go! Go. "
My mother asked me again, "Where do you want to buy gifts?" I replied to my mother, "I want to go to Lianhua supermarket to buy gifts, can I?" Mom smiled and said, "As long as you answer my question, we will go to Lianhua Supermarket." "ah! Answering questions again? Didn't I just answer? " I'm a little unhappy to say. "Just now, it's now, so do you want to go to Lianhua Supermarket?" Mom asked me with a smile. I had to say, "Go, of course, you name it, and I will definitely answer." Then, my mother said, "We take the bus 105 to Lianhua Supermarket in front of our house. There are five stops on the way, each of which is 400 meters away. Calculate carefully, how long is this road? "alas! I finally breathed a sigh of relief and replied with a smile: "This is too simple! With 400 meters? 5=2000 meters will do. " "Exactly! Let's go We set off for Lianhua Supermarket. " Mom said happily.
My mother and I finally came to Lianhua supermarket and bought my favorite gifts. Hehe ... Today is my happiest day.
Five diaries
It is sunny today. I go shopping in the supermarket. I saw a lot of things as soon as I entered. So I went shopping in desperation, and soon my basket was full, so I asked my father, "Can you count the things here?" Dad touched his head. Who can work all this out at once? I said I could. I soon got tired of counting heads. Dad thought of a good way to find the cashier and ask him to help us.
I went to the cashier and said to my aunt, "can you help me calculate?" It is too difficult for us to calculate with our mouths. Please help us find out. After a while, I repeatedly praised and said, "Good, that's amazing. I asked my aunt how you did it. My aunt said, "It's not difficult for me to do such a small thing. I count by mobile phone. I said I was stupid. I didn't expect this. We packed our things and left. I've always wondered why my aunt knew all this. I don't know how my aunt came up with this and I didn't.
When I got home, I realized that there is mathematics in life, just like what happened today, there are things about mathematics. For example, many things can't be calculated clearly, so you can use a calculator. If you don't have a calculator, you can also use something like a mobile phone to calculate these numbers. Isn't this a solution? Solving everything in mathematics depends on the brain.
Therefore, life is inseparable from mathematics. When you encounter difficulties in mathematical calculation, use your brain to find a way.