Math diary 1 how to write it?
20 1X year x month x day x week x sunny.
The teacher asked us to fold the circle in the study tool and see what we can find from it. I wonder in my heart: a circle is a circle. What is there to fold? So let's fold the circle and understand the symmetry of the circle!
We took out scissors and cut a circle, and then cut it into eight parts on average. The teacher asked us to think about how to make the ball out of a circle. Some students say multiply by π, others say calculate by radius ... Everyone is full of arguments and the class is very active. Finally, the teacher asked us to try to put eight pieces of fan-shaped paper together. I spelled a figure similar to a parallelogram.
Then, we divide the circle into 16 and 32 respectively, and then put the cut small sectors together to form a polygon. At this time, I found that the more the average score, the closer the graph is to a rectangle.
Because: the area of a rectangle = length x width.
So: the area of the circle =C/2×r=2πr/2×r=πr2.
After the decomposition and reorganization of the graph, I know how to find the area of the circle! Math is amazing ~
How to write 2 in math diary
Today, we know the unit of area. I know that the nail surface of my thumb is about 1 square decimeter, and the size of a thumbtack is about 1 square meter. After class, I measured that my desk is about 6 square decimeters long and 4 square decimeters wide, and its area is 24 decimeters. I also know that the area of one side of my eraser is about 8 square decimeters. After school, I went back to my home with a housing area of 150 square decimeter, touched the switch and turned on the light. I found that the size of the switch at home is about 1 square centimeter, and each floor tile at home is about 36 square meters.
I was hungry, so I ate a piece of bread 1 square, and then I did my homework on a square table 1 square centimeter. Open a 24-square-centimeter math book and find that the homework is very simple. I'll finish it in a minute. I turned on the TV with a 30-square-meter screen and watched cartoons for a while. After dinner, my father and I looked at the photo album together and looked at the photos, which were about 1 square meter. I can't help laughing. I also talked with my father about today's study. Father touched my head and taught me to study hard. I took my father's palm about 1 square meter, looked at the calluses on it and said affectionately, Dad, I will definitely listen to my teacher and study hard.
How to write 3 in math diary
On the weekend, my father and I went to the supermarket and bought a rug outside the bedroom door. When we arrived at the supermarket, my father chose a color, which has two shapes: round and square. The waiter told us that the perimeters of the two carpets are the same, both of which are 12.56dm. Dad said, "It's the same size anyway, so you choose!" I quickly shouted, "I'll do the math." I asked the waiter for a pen and paper and calculated the area of the circle according to the method taught by the teacher.
To calculate the area of a circle, first find the radius of the circle: 12.56÷3. 14÷2=2 decimeters, and the area: 3. 14×2×2= 12.56 square decimeters.
The side length of a square is 12.56÷4=3. 14 decimeter, and the area is 3. 14×3. 14=9.8596 square decimeter.
"So even if the circumference of a circle and a square are equal, their areas are not necessarily equal. It is more cost-effective to buy a round carpet than a square carpet. " I talked with my father endlessly, and my father was dumbfounded. The waiter on the side also praised me for being smart. I don't want to mention how happy I am.
There is mathematics everywhere in life, and there is learning everywhere!
How to write 4 in math diary
Grandma is over seventy years old. She is busy shopping and doing housework during the day, cooking dinner and washing clothes at night ... very busy. So I decided to save time in my memory, arrange grandma's time reasonably and let grandma have a good rest.
This Saturday, I finished my homework quickly and observed my grandmother's housework: cooking 15 minutes, braising carp 15 minutes, braising potatoes 10 minutes, scrambled eggs with leeks for 5 minutes, mopping the floor for 30 minutes, washing dishes 15 minutes and boiling water/kloc. Is there any way to save time and finish housework? I thought "yes" and a thought flashed through my mind, "just use what I have learned to arrange my time reasonably." I made a plan based on this information.
Time required to do housework at the same time
Cooking 15 minutes, potato stew 10 minutes.
Stir-fried eggs with leeks for 5 minutes.
Braised carp 15 minutes.
Boil water 15 minutes, wash dishes 15 minutes.
The washing machine washes clothes for 30 minutes and mops the floor for 30 minutes.
Total: 75 minutes = 1 hour 15 minutes, saving 60 minutes.
"Yes," I cheered happily. It used to take more than two hours, but now it only takes 1 hour, 15 minutes! I was happy to show the form to my grandmother. She looked at it and gave her thumb and said, "This book was not read for nothing!" " "
From this, I know that mathematics is very important to us. I will try my best to learn it well!
How do you write 5 in math diary?
1 1.5 Saturday weather: sunny
Importance of 0
0 is a mysterious number, as elusive as the mystery in the universe. 0 is also an important number. If you accidentally add an extra 0 or a less 0, the consequences are really unimaginable.
This math exam really made me realize the importance of 0. It was 99 points when the test paper was handed out! I made a mistake at once. The result made me dumbfounded. The result is 4500÷90. "How could I make a mistake with such a simple question?" I muttered to myself. I remember that when I dictated the 45,000-90 question, I easily wrote down 50, and I was still very confident. But in the end, I got 500, which was a 0. How wrong it is! What should not be wrong is also wrong. How important 0 must be!
If I become the financial general manager of the company in the future and someone else comes to withdraw money, I would have taken 10000 yuan, but I added 0- 100000 yuan more, and I still put 10000 yuan on the bill. Then who should I ask for this 90 thousand yuan? I will bear all the consequences!
Through this incident, I understand that I should be meticulous in my work and study, otherwise the consequences will be very serious.
Comments: In a math exam, young authors can find out the causes of mistakes and make in-depth thinking and introspection, so as to realize the importance of "0" and thus lead to a serious attitude towards future work. It is really commendable to have such knowledge at an early age.
How do you write 6 in math diary?
Today, my mother took me to the market to buy food. There are so many dishes in the market! My mother and I walked and watched, and unconsciously came to the place where we bought mustard tuber. I said, "Mom, shall we buy a bag of mustard tuber?" Mother said, "All right! But you have to answer a math question. One yuan for four bags of mustard tuber and a few yuan for one bag? " I thought about it and said, "2 yuan 50 cents." Mother said, "Think again!" "oh! I thought for a moment and said, "It should be 25 cents." I said. My mother smiled and asked me how I worked it out. I said, "I took it apart and worked it out. Buy two bags for one yuan, fifty cents each, and then buy two bags for fifty cents, twenty-five cents each, which is equal to the price of four bags for one yuan. " "Mom said," You are so smart. You got it right. This package of mustard tuber is for you as a prize! "Before I reflected, I always had a bad habit, that is, I couldn't sit still in class and always had to leave my position. I don't know how many times my mother has told me this habit, but I always turn a deaf ear and can't quit.
Not long ago, with the help of my teacher and mother, I thought of a good way, that is, let the teacher record my performance in class every day. It really worked. I gradually got rid of this bad habit. But the teacher said that I still have a bad habit, that is, I like to interrupt in class, but I don't know why, I want to try to correct it, but I can't help but say it when I am excited in class. I made up my mind to get rid of this bad habit before the end of May, and let my teacher and mother watch my actions.
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