In daily life, everything is inseparable from mathematics, which shows how close mathematics is to us. During the winter vacation, my parents and I went to my cousin's house to play. I was thirsty on the road, so my father had to buy mineral water from the nearby grocery store. There is a rule in the grocery store: if you buy three bottles of mineral water, you can get a bottle of mineral water, and the price of a bottle of mineral water is 1 yuan. When my father saw it, he took out 10 yuan and gave it to the grocery store owner, saying, "The boss bought 10 bottle of water." When I got the water, I drank it hungrily, and soon I drank two bottles. Before I came to my senses, there were several empty bottles. Dad asked me, "How many bottles of mineral water can I exchange in Hui Hui, 10 yuan?" I think: I drank 10 bottle of water, 9 empty bottles were replaced with 3 bottles of mineral water, 3 empty bottles were replaced with 1 bottle of mineral water ... and there were two empty bottles left. I happily said to my father, "Dad, I have worked it out. Yes 14 bottle of mineral water, and there are 2 empty bottles left. " Dad smiled and said, "Think again!" I said thoughtfully, "We can borrow another empty bottle from the grocery store owner and return it to the boss after drinking it. Oh! We can drink 15 bottles of mineral water. " Dad nodded in praise.
Mathematics is to use it flexibly and integrate theory with practice. Only by mastering the knowledge of mathematics can mathematics serve us better. So we should learn mathematics well and make mathematics a good helper in our study and life.
Fourth grade math diary model essay 2
I often hear the teacher say that mathematics is of great help to life. In life, we often encounter mathematics. This time, through personal experience, I really realized the importance of mathematics. On Sunday, my uncle drove our family to Luoyang, and I was very happy. Big cities are just different. High-rise buildings are everywhere, and shopping malls are very lively. Every specialty store is holding a "Double Twelve" promotion. My mother took me to Metersbonwe Bang Wei Bang Wei MooMoo store to buy clothes. I took a fancy to a red down jacket at a glance. The price of the tag is 499 yuan, which is so expensive! Assistant aunt said: "children, you can get a 6.9 discount on two pieces, which is very cost-effective!" " "We chose a blue down jacket for my brother, 399 yuan, and finally we can get a discount. Auntie quickly calculated for us: "499× 0.69 = 344.31.399× 0.69 = 275.31.344.31= 619.62, rounded to one. Mom said, "We also have activities there. The first original is 50% off, and the second is 50% off. " As soon as I heard the "50% discount", I took my mother and said, "Mom, don't buy it. Go to our place and buy it cheaply. " Mom said, "Settle the accounts well and see where to buy cheaply?" The first one is 499 yuan, and the second one is 399×0.5= 199.5, totaling 499+ 199.5=698.5 yuan. The result really surprised me. It's cheaper in Luoyang than in 80 yuan! "Aunt, please help us wrap our clothes!" I'm embarrassed to say. Everyone laughed.
Hey, life is full of math! It seems that we should study math harder in the future, or we will lose money.
Fourth grade math diary model essay article three
Last night, it was very hot. Dad stopped me when I took out a watermelon to cut. He gave me a question, the title is: cut this watermelon into nine parts and cut out ten skins. See how you cut it? At this point, I thought, well, it's simple. So, I went to get a fruit knife, put the watermelon on the table and cut it. I cut a "meter" shape. If you count, nine dollars is enough, but only nine dollars! Not convinced, I brought another watermelon. When I was about to cut it, my father stopped me. He pointed at me and said, "Oh, how many watermelons did you waste?" Let me cut it! "Dad picked up a fruit knife and told me to watch. I watched the audience carefully. At this moment, a question mark flashed through my mind. What should I do? After dad cut it, I counted it. There were only nine skins, but he cut it in the shape of a well. I looked at my father and said, "Dad, didn't you cut nine pieces?" Dad saw my puzzled look and told me the "hiding place" of the tenth piece of leather. It turned out that the tenth piece of skin was hidden under the mouth in the middle of the word "hmm" before I suddenly realized.
At this time, my father looked at me and guided me according to the situation: "There are many things in life. As long as you observe carefully, you will definitely gain something, just like cutting watermelon this time. " I nodded my head.
Math diary's model essay in Grade Four, Chapter Four
On Sunday, my parents took my sister and me to visit the museum. There are many cars and electric cars parked in the museum compound. Dad stopped, looked at his mother, and said, "While your dad stopped, I'll make a debut for you two." Mom's problem is that there are bicycles and cars in the parking lot-there are 24 cars, and the tires are all 54. Each car counts four tires. How many bicycles and cars are there?
I feel a little carsick after listening to my mother's question. However, when I saw my seriously thinking sister, I immediately woke up a lot and began to think about my mother's problems.
I think so: if there are 24 cars in the parking lot, then 24× 4 = 96 tires will be used. But there are only 54 tires, so 96-54 = 42 tires. Because a bicycle has only two tires, 42 divided by 2 equals 2 1 bicycle. Finally, a total of ***24 bicycles minus 2 1 equals 3 cars.
Right? I sum up my answer as follows:
2 1 bicycle *2 tires = 42 tires
3 cars *4 tires = 12 tires
42+ 12 = 54 tires
Yes, that's it.
I was about to tell my mother the answer when my sister hit me and said, "2 1 bike, 3 cars."
"What about the problem-solving process?" Mom asked.
The elder sister replied: "Let the bicycle be X, the car be Y, and the equation X+Y = 24; According to two tires of bicycle and four tires of automobile, the equation 2x+4y = 54 is obtained. Finally, the number of bicycles is 21; There are three cars. "
Hearing that my sister's problem-solving process was different from mine, I quickly expressed my thoughts.
Finally, my mother praised us for being good at thinking!
Fourth grade math diary Fan Wenwu
I read such a question in the primary school newspaper today. A snail climbed up the shaft wall from the bottom of 12 meters deep, climbed 3 meters during the day and fell 2 meters at night. How many days can this snail climb to the wellhead?
After seeing this problem, I think: climbing 3 meters during the day and falling 2 meters at night is equivalent to climbing only 1 meter every day, climbing 1 meter every day, and the well depth 12 meter. Isn't that 12 days to climb to the wellhead?
However, the answer is wrong.
How could it be wrong?
Oh, yes. Will you slide down when you climb to the exit on the last day? I can't help laughing at the thought. This question is so interesting! If you don't pay attention, let us give the wrong answer.
The correct thinking should be: climbing 3 meters during the day and falling 2 meters at night is equivalent to climbing 1 meter a day, but pay attention to 12-3=9, which means climbing 1 meter every day for the first 9 days, but on the day of 10, the snail climbed to the wellhead when it climbed 3 meters.
Dear friends, do you understand? If you don't understand anything, welcome to the "Little Math Room, Happy You, Me and Him" to find me!