My pet not only has a chicken, but also a turtle named Picker. Once I carefully observed the folk medicine and gave myself a math problem: the folk medicine ate 50 grams of meat for two days and drank 0.5 ml of water for half a day, and stayed in my house for one year, and it was one millimeter long for three months. How much does Pinky eat and drink at my house? * * * How many millimeters has it grown? I calculated: eat 50/2=25 (grams), 365x25=9 125 (grams), and drink 0.5x2 =1ml365x1= 365ml.
One year, the tortoise 12/3=4 mm long.
Math diary Grade Two Today, my mother and I signed up for swimming class, table tennis class and summer camp.
We went to withdraw money first, and took 3000 yuan for the first time. I got 20xx yuan for the second time and 20xx yuan for the third time. Q: How much did I take? 3000+20xx+20xx=7000 (yuan) A: A * * * took 7000 (condition, relationship).
We went to the swimming pool first. We found the person in charge of training first. We signed up for a swimming class and spent 530 yuan. Q: How much money is left? 7000-530=6470 (yuan) A: There is still 6470 yuan left (conditions and relationships).
It cost 20xx yuan to sign up for the summer camp. Q: How much money is left? 6470-20xx=3470 (yuan) A: There is still 3470 yuan left (conditions and relations).
It took 450 yuan to sign up for a table tennis training class. Q: How much money is left? 3470-450=3020 (yuan) A: There is still 3020 yuan left (conditions and relations).
Living expenses should also be included. Q: How much money is left? 3020-3020=0 (yuan) A: And 0 yuan (conditions and relations).
Take 7000 yuan and spend it like this.
Math diary, second grade, third grade, what is double?
The dictionary explains that if a number is the same as the original number, it must be multiplied by a number. For example, 4 times 5 equals 20.
What is a multiple? One number can be divisible by another number, and this number is a multiple of another number. For example, 20 can be divisible by 4 or 5, so 20 is a multiple of 4 or 5.
The relationship between time in life is: a pair of chopsticks, a pair of shoes, a pair of socks, a pair of gloves, four wheels of a car, street lamps on both sides of the road; Table, chair, four legs of a bed, a pair of badminton rackets, and leaves of some families and genera also grow relatively. ...
There are also words expressing time in the vocabulary: out of pairs, in pairs, flying with me, etc. There are also overlapping words such as booming, high and low, jumping and jumping.
Time is very useful for us to calculate some data in our lives. I want to study hard, understand the interpretation of the times and learn to use it.
From the students of Grade Four and Grade Two, math diary can truly feel that mathematics is around and life cannot be separated from mathematics, thus inspiring their enthusiasm and enjoying the happiness of learning mathematics.
Preview is a golden key. After math class today, the teacher arranged for us to preview division estimation. What is a preview? Why does the teacher want us to preview? I came home with a surprise. Check the information and ask your parents. The original preview is to read the contents of the book before learning a new lesson, so that you can have a preliminary understanding of the new knowledge.
I previewed the division estimation curiously. Through preview, I know that when estimating 538÷62, 538 can be regarded as 540 and 62 as 60, so 538÷62≈9. It turns out that preview can help me clear away the obstacles in math learning and have a preliminary understanding of estimation. Can quickly accept new knowledge in class. Even if there is doubt, it can be easily solved. Therefore, it is very important to preview before class, so we must develop the good habit of preview, because successful preview can make the lecture quality higher and the learning efficiency higher, so it is the golden key to open the door to knowledge.
Today, I do my homework quietly at home. After a while, I finished my homework. I went to watch TV. I saw those colorful bubbles on TV. They are beautiful. I turned off the TV and went to find four friends. We made bubble water with our own soapy water. We blow big and beautiful bubbles together. I said, "Let's count how many we played together!" " Divide the bubble we blow together by 5 and see what it is.
The next day I blew 1 1, Xiaohong blew 10, Xiaoming blew 15 and Xiaojun blew 14. We will use it; 11+10+15+14 = 50. In use; 50 divided by 5= 10 (pieces). Let's talk at the same time; Ha ha! Equal to 10. ; Looking at these beautiful big bubbles, we are all deeply attracted by them. It seems that we all forgot to go home.
I often get 65,438+000 points in the math exam of Grade Six and Grade Two, math diary. Other students asked me what tips I had, and I told them that I had a "revised version", which helped me a lot.
In the past, when handing out exercise books or test papers, I only looked at the grades or scores given by the teachers, and never considered what was wrong, why it was wrong, and how to correct it. As a result, every time I make a mistake here or there, I can't get full marks. Once, my math teacher said to me, "We should really learn knowledge when we learn knowledge, and we can't just look at grades and scores. If the question is wrong, carefully analyze the cause of the mistake. I suggest that each of you prepare a correction book, copy down the types of wrong questions, find out the reasons for the mistakes, and seriously correct them. " From then on, I prepared a small notebook, only the size of the palm of my hand, and wrote three words on it, "Correct the wrong book".
Whenever exercise books and test papers are handed out, I always analyze them carefully, copy the wrong questions on the "correction book", carefully analyze the reasons for the mistakes, mark the mistakes with a red pen and correct them carefully. For example, when I was learning to solve equations, it was recorded in my "error correction book".
On the seventh day of the second grade in math diary, the number class was in the self-study class, and the teacher "10" had something to leave the classroom. Now "4", "6", "8" and "9" are naughty in the classroom First, "9" became 3×3, and "8" became 2×2.
The monitor of "0" was very anxious when he saw the classroom in such a mess. He said loudly, "Stop it, everyone, and be quiet!" But "0" is the smallest and weakest, and no one listens to him. At this time, the monitor of "0" had a brainwave and used his quick wits to make 0=0× 10. At the sight of "10", "9", "8", "6" and "4", the disruptive teachers were so scared that they quickly switched back to their original seats to study hard, and the classroom was quiet again.
Math diary, a sophomore, went to the Education Bookstore to buy books after physical therapy on August 17. When he got home, it was already six o'clock and his father was coming back. We haven't cooked yet, so it seems that we have to use math knowledge to "cook quickly".
My mother told me that washing cauliflower takes about 2 minutes, cutting cauliflower 1 min, heating the pan for 2 minutes, pouring oil 1 min, burning oil 1 min, and frying for 5 minutes. She wants me to help her find the most economical order. I said, "No problem!" Then I took a blank piece of paper and a pen and began to think.
When the pot is hot, you can wash the flowers; Then pour the oil; Then burn oil, and cut flowers when burning oil; When everything is done, the cauliflower will be fried. I calculated that 2 plus 1 plus 1 plus 5 equals nine minutes. Originally, it took 12 minutes. It only took nine minutes after my planning. Mathematics is really integrated into life! I took the answer and told my mother who was cooking other dishes. My mother took the answer and gave me a new task.
With the cooperation of both of us, we finally cooked the meal before Dad came back.
In the second grade of math diary, my mother took me to travel to Chengde. Chengde is a mountainous area. On the way to the scenic spot, we have to go through many tunnels. My mother asked me, "Can you calculate the length of the tunnel?"
I thought about it and said, "As long as we know the speed and the time of passing through the tunnel, we can find out the length of the tunnel, that is, distance = speed × time". After that, I silently looked forward to reaching the next tunnel so that I could try my way.
Walking, it suddenly became dark, "I entered the tunnel", and I began to silently count 180 times in my mind, that is, 180 seconds or so. After three minutes, it cleared up and "got out of the tunnel". At this time, I asked the driver that the speed was 75 km/h, which was 750,000 minutes.
Math diary Grade Two10 It was cloudy on Sunday, April 25th.
Today, my parents and I went to Ruifeng Shopping Mall and bought an automatic washing machine. My mother went in and asked my aunt how much the automatic washing machine was. Aunt said "7000 yuan", and mother asked her if she could pay less. Aunt said, "Look, you are an old customer here, and I will give you a 20% discount." I asked my mother how much is a 20% discount? Mom said, "That is, divide 7000 into 10, and each share is 700". Aunt said, "I'll give you two less." Aunt, let me calculate how much it is.
2×7= 14 yuan is 1400 yuan, and 7000- 1400 = 5600 yuan. My aunt praised me for being so clever.