One day, my mother and I went to the mall and went to a shoe store to buy shoes. There is a big piece of paper written next to the shoes, which says "30% off". I thought to myself, isn't 30% discount just divided by 7? I told my mother what I thought. My mother said, "The original price of 700 yuan, divided by 7, becomes 100 yuan. Is this possible? It should be the original price divided by 10 and then multiplied by 7, which becomes 490 yuan. "
After my mother explained, I knew the discount algorithm. Oh, there is wonderful mathematics in life.
Today, my grandmother and I went to the market, and she bought me a pair of shoes.
When the shoe seller accepted 23 yuan, grandma reduced the price to 17 yuan, and finally grandma paid him 50 yuan. How much should the shoe seller ask grandma?
50- 17 = 33 (yuan), I said to the shoe seller, "You should call me grandma 33 yuan." The shoe seller said, "The child has a quick reaction." Grandma said happily, "You should study hard so that you can know more."
Today, my mother took me to Jacques. I ordered a set meal of 30 yuan. My mother ordered two roasted wings 10 yuan. My mother asked me to calculate a * * *, how much is it? I will soon be 30+ 10 = 40 (yuan). Mom was right when she said you were great.
Then my mother gave her aunt 100 yuan when she paid. My aunt asked me, little friend, how much should I give your mother? I said 100-40 = 60 yuan, and my aunt praised me for being so smart. Haha, I didn't expect to be able to do math problems while shopping.
This Saturday, my mother and my brother went to the supermarket.
Mom first took a Chinese cabbage: 1 yuan, noodles 6 yuan, handmade steamed bread 2 yuan, cakes 4 yuan, Shaqima 2 yuan, flour 33 yuan, pipa legs 10 yuan. Finally, mom said, how much are you?
I am a ***58 yuan.
Mathematics in life can really come in handy.
Today, our school sells books.
I can't wait to run out of the classroom as soon as class is over.
I chose a book, The Unsolved Mysteries of the World, and I brought 1 1 yuan. How much should I get back for this book, 6 yuan? I used the subtraction method taught by my math teacher to work out that 1 1 minus 6 equals 5, leaving 5 yuan, so I can buy another book.
I bought another book in the afternoon, which is also 6 yuan. I use the addition calculation taught by my math teacher. Six plus six equals 12. I spent 12 yuan today.
On my way home, I saw a lot of paper towels piled on a bicycle. My mother asked me if there was a good way to count how many packets of paper towels there were. I touched my head and thought, it's too laborious and time-consuming to count so many packets of tissues. I'll ride far before I count. Is there any good way?
So I carefully observed the paper towels in the car. There are two layers of paper towels, with 5 packages horizontally and 8 packages vertically on each layer, hehe! Got it!
I quickly said to my mother, "There are 80 packs of napkins." Mom asked why? I proudly said, "We have learned multiplication, and we can quickly work out that 5X8=40 is the number of each layer, and a * * * has two layers, which is 40X2=80." My mother nodded and agreed with me. Mathematics is really a good skill, which helps us solve small problems in life. I must study harder!
Today, my mother and I played a game of selling things.
The game is like this: I am the boss. I'll put my favorite things on the table first and mark the price. Then my mother is a customer. My mother came to my booth, and I quickly asked, "What do you want to buy?" Mother looked at it and said, "I want a pencil and a racing car." How much is it? " I said, "The racing car is ten yuan, the pencil is fifty cents, and a * * * is ten yuan and fifty cents." My mother gave me fifteen dollars, and I quickly worked out four dollars and fifty cents for my mother.
Soon, my mother came to buy a bear and a fountain pen, which cost thirty yuan. My mother gave me fifty dollars, and I gave my mother thirty dollars.
Mother said, "This little boss is really good at accounting."
I am very happy and like this game very much.
Today, I will measure my height.
Aunt stepped on the small hook of the tape measure, and I stood on the bed and pulled the tape measure up. I looked at it, and it was 164 cm. In other words, the aunt's height is 164 cm, or it can be said that the aunt's height is 1.64 cm.
I stood on the ground again, and menstruation measured my height. My height is 1.20 cm, which means1.20cm..
How interesting! I took out my pencil case and measured its length to be 20 cm. Xinhua dictionary is about 13 cm long. This clock is 60 centimeters wide. My chair is 3 1 cm high. The capital letter is 1.20 cm, or1.20cm.. Haha, exactly the same height as me.
Stop writing, I have to test something else!
This morning, my mother and I went shopping in Xidan shopping mall. As soon as we entered the supermarket, we saw a dazzling array of things, which dazzled us.
So my mother asked me, what do you want? I said happily, "I want a packet of biscuits 1 yuan, a box of chocolates 10 yuan and a bottle of water 1 yuan." Mom smiled and said, "How much did you spend?" I am happy to say, "1+10+1= 12 yuan, a * * * flower12 yuan." Mother said happily, "You are right." Mom asked again, if I give you 20 yuan, how much should I get back? I smiled and said, "20- 12=8 yuan, you should find 8 yuan. My mother said," You are right again. "Then, my mother gave me 20 yuan, and I jumped over to pay the money.
You know! Mathematics is everywhere, as long as you observe it with your heart, you will find it. We must study math well in the future!
Today, "children" have the final say. I took the money my father gave me to buy food.
I came to the vegetable market and wanted to buy food. The food in the market 1.5 yuan, ready to buy 2 kg. But I looked at the food outside the market, which is 1.2 yuan, which is more delicious than the food inside. I was going to buy another catty and fry it at night, which not only bought more vegetables, but also became cheaper and cheaper.
Then, I go to buy meat. The meat on the market is lean meat, 4.5 yuan is a catty; As for the meat outside the market, the lean meat is one kilo less than that of 4.5 yuan. In contrast, I certainly choose the meat in the market. So I bought 3 Jin of meat and spent 4.5×3= 13.5 yuan.
I was deeply impressed by buying vegetables this time.
Today, we came to the shopping mall and saw an original dress: 30% off 280 yuan. Mom asked me, do you know what the price is now? I thought of the discount problem mentioned by the teacher in class, that is, the original price discount/10= current price.
I thought about it and told my mother to use 2803/ 10=84 yuan. Mother nodded. When my mother and I saw something, we continued to go shopping. My mother said, "After 50% off, it will be 98 yuan." Mother asked, "Do you know its original price?" I'll tell my mom right away that it's 196 yuan. Mom asked me how you got it out so quickly. I said, "The original price is 5/10 = 98,98x10/5 = the original price = 196 yuan. The other is the original price 1/2 = 9898 x2 = 196 yuan. So the original price is 196 yuan. My mother nodded and said, "Good, I can use the math knowledge I have learned to solve problems in my life. "
Mathematics is indispensable in life, and mathematics cannot be separated from life. As long as we are good at discovering, mathematics is everywhere.
We learned the multiplication and division of decimals, and I've been thinking, when can we use them? Hey, it's really useful!
On Saturday, my father and I went to the steak house to eat steak. Dad took out a discount and a VIP card from 20 yuan and said to me, "We ate 150, and the VIP card can be 15% off." This offer can be used in 20 yuan and cannot be used repeatedly. You calculate, which is cheaper? "
This is not simple! I quickly listed two formulas: 150 times 0.85 and 150 minus 20. I subtract 20 from 150 and the number is 130. And 150 times 0. The answer to 85 is 127.5 yuan. And130 >; 127.5 is cheap in 2.5 yuan, so it is cheaper and more cost-effective to use VIP cards.
I told my father the answer, and my father said, "Well, that's right. There are still many small math problems in life, and you will encounter many in the future. Try to explore them. " Dad went on to say, "Come on, let's pay!" " "
In our life, mathematics is everywhere. We should not only learn the knowledge from books, but also apply this knowledge flexibly to our lives, so that our mathematics can be better and better. The more we learn, the stronger we will be!
Yesterday, my mother and I went shopping and bought me new clothes.
I chose a white coat in Mason. It was so beautiful that I asked my mother to buy one for me. Just in time, Mason handled it, buy one and get one free. This dress 169 yuan, and you can get another designated dress. I have a crush on a 159 yuan black sportswear.
Mother said, "If you want, you have to work out how much discount we will give on these two clothes?"
I thought about it: discount = current price ÷ original price, current price 169 yuan, original price 169+ 159,169 ÷ (169+159.
Hearing this, my mother said, "Not bad! Apply the original knowledge to life, yes, these two clothes are for you! "
"Yes!"
In fact, mathematics is hidden everywhere in life. As long as you observe carefully, you will find!
Today, my mother took me to the new supermarket in Lingbao, Dao Mei to buy new year's goods.
We just caught up with the competitive promotion of two kinds of paper. One piece of paper: buy three get one free, 4 packs *** 15. 6 yuan. B paper: buy one get one free, two packs of ***8. 3 yuan.
When my mother decided to buy Model B, I stopped her and asked her why. My mother said, "The second one is 8. 3 dollars! "
"8.3 yuan is not necessarily cheap, I will help you calculate."
I said to myself: A buy three get one free, 15.6 yuan, that is, you can buy four packs for three packs. So use 15. 6*3/4= 1。 17 yuan.
Class B, buy one and get one free, ***8.3 yuan, that is, you can buy two packages for one package, 8.3/2=4. 15 yuan.
1. 17 yuan
There is so much math in life!
At noon on Saturday, I asked my father if lunch was ready. My father gave me a look and said, "since you asked about cooking, I'll ask you a question about cooking." If it takes 30 minutes to cook a dish, 15 minutes to cook a leek, 5 minutes to cook a vegetarian dish and 10 minutes to cook a soup, how many minutes does it take to cook this meal? "
As soon as I heard it, I thought it was too simple. Isn't that the sum of these figures? I did a quick calculation, 30+15+5+10 =1hour. I was about to tell my father the answer, but I inadvertently saw my father's sly eyes, and I suddenly thought of something. This question may not be that simple.
So I reconsidered the problem. I thought for a while and finally came up with the answer. I said to my father, "it takes 30 minutes to cook, and so does cooking two dishes and a soup." Because cooking and soup can be done during cooking time, it takes 30 minutes to cook this meal, right? " Dad smiled and said, "You are great. You got it right. "
Through this question, I realize that our life is full of interesting math problems. As long as you know deeply and think carefully, you can get the correct answer.
On Sunday, my family went shopping in RT Mart.
When I came to the supermarket, I bought some snacks first, and then my mother said that the cooking oil at home was running out. Let's buy some oil and go home. When I came to sell oil, my mother took two barrels of arowana soybean oil and was ready to leave. I asked my mother out of curiosity how much these two barrels of oil cost. Mom said a barrel of oil. 28 yuan, how much do you think two barrels of oil are? I calculated that it was 56 yuan, and I saw a big barrel of 5 liters of oil here. Looking at the price in 50 yuan, it should be 10 yuan per liter. I asked my mother, which is cheaper, your two barrels of oil or this big barrel? My mother said, "It should be about the same, no matter." But I'll get to the bottom of it. Later, I saw that the two barrels added up to 5 liters, which was 1 1.2 yuan per liter. I told my mother that we should buy this vat. Although it's not much cheaper, we can use the money saved to buy some small stationery. Why not?
Mom said, little girl, it seems that this kind of math application is everywhere in life, and it is a good application in life. You should study math more carefully in the future, you know! Finally, our family went home happily.