A day's life is over before you know it. There must be many unforgettable moments. At this time, how can the most critical diary be left? But how can I keep a diary to shine? The following is a sample essay in math diary format compiled by me. Welcome to reading. I hope you will like it.
How many birds are there in each?
I met another math problem today, and it took me a lot of effort to solve it. The topic is: there are 30 birds in two trees, and 4 birds fly away from the second tree first. At this time, tree A flew to tree B with three birds, and the birds on the two trees were just equal. How many birds are there in each tree?
As soon as I saw the topic, I knew it was a reduction problem, so I solved it by the method of reduction problem. But when I checked, I found something was wrong. I will do it again more seriously. I think there are as many as four missing, half of them are 13, and the restored B-tree is14; A tree is 16. The formula is: (30-4) ÷ 2 = 13 (only); 13-3+4 =14 (only); 30- 14 = 16 (only). The answers are: a tree 16 and b tree 14.
By solving this problem, I understand that no matter what I do, I should be careful, otherwise, even if I master the solution to the problem, the result will be wrong.
consider
Today is Saturday, 10, 15. My father and I went shopping in South Street.
At 8 o'clock in the morning, we arrived at South Street by bus. There happened to be an old man beside the platform, and there was a talking scale beside him.
Seeing me coming, grandpa smiled and said, "Little friend, do you weigh yourself?" ?
I asked a little curiously, "How much does it cost to weigh it once?"
Grandpa replied cheerfully: "You can only weigh 1 yuan at a time, and you can also measure your birth height!"
I thought to myself: this is really killing two birds with one stone!
So I stood firm on the scale. Grandpa turned on the switch and only felt something soft touch my head. Then, a small rectangular note is printed on the machine, which reads: "Weight: 27.0 kg, height 132.5 cm"! This half year is 4 cm taller, but what about the weight?
At this time, I remembered that the math teacher said that "kilogram" has another name called "kilogram". I didn't expect to meet you today, and I know that I have gained 2 kilograms!
I was so happy on the way back! I must exercise my body!
Incredible data
Today, I came across such incredible data in a book: "A piece of paper with a thickness of 0.0 1 cm is thicker than Mount Everest after being folded in half for 30 times?"
This data is a bit "absurd" no matter how you listen to it. After all, it is a thin piece of paper. Can folding in half really surpass Everest? But many unexpected things may happen, so only through calculation can we uncover the mystery of all this.
Immediately I multiplied 0.0 1 cm by 2,1* * 30 times to get10737418.24cm.. Then, I converted the height of Mount Everest from 8848. 13 m to 8848 13 cm. By comparison, it is obvious that the thickness of paper folded in half for 30 times is indeed better than the height of Mount Everest, which is more than 10 times of the latter.
In fact, amazing data like this are everywhere in ordinary life, as long as you have a pair of eyes that are good at discovering.
The process of learning mathematics
There are still many episodes in learning math for me-in recent weeks, we have been learning how to divide by a number. Because of lack of experience, I don't know much. There are always mistakes when doing problems. My mother always teaches me when I am free, but my mind is still blank. I always feel that what my mother said is just something I don't understand.
Mother can't help me, so she has to let me do exercises by myself. My mother told me first: the division formula is like going down the stairs. If the highest digit cannot be divided by the divisor, move the second digit down. If the last digit is not enough to divide, write 0 directly where you write. What my mother said made me understand the mystery. Although there are still mistakes in doing the problem, I can correct them soon.
Understand the reasons for the split, let me understand the truth of life, do everything step by step like taking the stairs, down-to-earth, or you may make mistakes again and again!
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Math diary's format
"math diary" means that students record their feelings and experiences in the process of mathematics learning and application in the form of diaries. Math diary not only truly reflects the students' learning situation, but more importantly, relatively objectively reproduces the interaction between teaching and learning. By keeping a diary, students can sum up what they have learned in mathematics, write down their gains and puzzles, and inspire themselves to observe life with math diary.
Math diary should remember his own discoveries, thoughts, feelings and mathematical methods. What math diary recorded is not limited to one aspect. Its materials and contents are unrestrained, and you can listen, watch and practice in class, after class and in life. ...
1. Cognition of Writing Mathematics
Students can write down what they have learned, understood, mastered and unclear in class. Through writing, it helps students to review old knowledge, deepen their understanding and mastery of mathematical knowledge, especially mathematical concepts, and urge students to sort out knowledge points purposefully in order to realize the internalization of new knowledge.
For example, a classmate wrote a math diary after learning "rice and centimeters": "Today, we learned rice and centimeters. When I got home, I measured it with a rice ruler, only to know that my height is only 12 1 cm, my father's height is 179 cm, my father is 58 cm taller than me, and my feet are 19.
When teaching this content before, students were very vague about the length of centimeters. By recording math diary in practice, students not only have a further understanding of the length of centimeters, but also practice the math problem of "Yu"
2. Write math activities
When students write about math diary, they can record what they think and how they operate in class. In the process of learning, when the group discusses and communicates, how to say and think, what the classmates say and what the teacher says; In group cooperative learning, what do you do, what do your classmates do, and how do your teachers guide you. In this way, the process of writing math activities is a process of learning from classmates and summing up knowledge.
3. Write mathematical thinking
Writing mathematical thinking is the main content for students to write about math diary. They can write reflections, such as learning attitude, learning methods, learning habits, learning interests, answering methods, suggestions to teachers and so on. In this way, there is another green channel for communication between teachers and students, so as to build a bridge for emotional communication between teachers and students, and to know students' learning situation, grasp and understand knowledge and suggestions on teaching methods in time.
For example, a classmate wrote in math diary: "Do you know, teacher, I have been distracted in class recently, and my energy is not concentrated ..." A classmate wrote: "Miss Wang, you speak too slowly, and sometimes you complain too much." Some students wrote in their diaries: "We really want to play more math games in class, and it would be better if we could play them in middle schools and schools."
Visible, math diary is like a mirror, reminding teachers to constantly understand students and improve teaching methods.
4. Write math applications
Often instructing students to write and apply math diary will greatly broaden their knowledge horizons, expand their mathematical ability and improve their ability to solve practical problems in daily life.
Look at what this classmate wrote: "My mother took me to the supermarket to buy things after school this afternoon. We bought four bags of chocolates at 1 yuan 85 cents each and four loaves of bread at 1 yuan 1.5 cents each; I also bought a bag of flour, 23 yuan 6jiao. Here's my calculation. 1 bag of chocolate and 1 loaf of bread add up to 3 yuan. Multiply the quantity by 4 *** 12 yuan, and add a bag of flour ***35 yuan 60 points, which is consistent with the invoice. "
From this diary, we find that students are catching mathematical problems from their lives, exploring mathematical laws and actively using mathematical knowledge to solve practical problems in their lives. By writing math diary, students not only understand the application of mathematics in life, but also learn to observe and experience life from the perspective of mathematics.
In a word, writing about math diary is an important way of learning. Math diary not only recorded the children's flash of inspiration, but also left a mark of mathematics in their hearts, which enabled students to contact life more widely and observe life more carefully, and effectively realized the mathematicization of life. It realizes the integration of disciplines and shortens the spiritual distance between teachers and students. Let the children get a pen and write math diary. "math diary" can give them a pair of mathematical eyes, experience mathematical life and enjoy the rich rewards brought by mathematical thinking.
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