How to teach computational power

1. 1、 Background of the project
1. To cultivate students' computing ability is an important task of primary school mathematics teaching and an important foundation for students to learn mathematics in the future. According to the quality analysis of usual testing and final examination, students' computing ability is generally low, which undoubtedly causes great obstacles to students' learning and development. In order to quickly and effectively improve students' computing ability, better develop students' thinking, and improve the quality of mathematics teaching in a large area, it is necessary to strengthen the teaching of calculation as a breakthrough in primary school mathematics teaching
2. Through the research of this topic, we should strive to improve students' computing ability, cultivate their oral, mental and written abilities, and encourage students to graally like mathematics and become interested in calculation in lively and relaxed learning. So as to improve students' academic performance and lay a solid foundation for students' future study< Second, the goal of the research is to find out the reasons for the slow speed and low accuracy of students' mathematical calculation< Looking for teaching breakthrough and teaching training methods that can improve students' mathematical calculation speed and accuracy: (1) strengthen students' oral calculation training by taking oral calculation ability training as a breakthrough 2) Control a certain amount of training to cultivate students' sense of number 3) While paying attention to the training of students' thinking ability, we should pay attention to the training of students' mathematical calculation, grasp the basis, highlight the pertinence, find the regularity, and properly integrate< Third, research measures
1
"in order to cultivate students' computational ability, we should pay attention to the basic training of oral arithmetic, insist on regular practice, and graally achieve proficiency." This is the requirement of mathematics curriculum standard. In the process of teaching, we should organize teaching and training in a planned, step-by-step and purposeful way, such as listening to arithmetic, reading cards and oral arithmetic, reading questions and calculating silently, and repeatedly emphasize that the first is correct and then fast
2. Strengthen basic knowledge and improve written calculation ability
in calculation teaching, oral calculation is the basis of written calculation, while written calculation is the key. Written calculation plays an extremely important role in primary school mathematics teaching. No matter how advanced the technology is in the future, the ability of written calculation is always a necessary ability for primary school students
(1) to enable students to understand the basic knowledge of mathematics and master skills is the primary condition for the formation of computational ability
each calculation is based on the corresponding concepts, rules, properties, formulas and other basic knowledge. If students don't understand these basic knowledge correctly and master them thoroughly, they can't calculate. Only after students understand and master the relevant operation properties, laws and skills, can they apply these knowledge in specific calculation to seek simple and reasonable methods, improve the accuracy of calculation and speed up calculation
(2) strengthening practice and skill training is the key to the formation of students' computing ability
for example, in the calculation of four items of scores, some students often encounter the situation that the calculation method is correct but the calculation result is wrong. The reason for the error lies in the basic skills such as score rection, general score or mutualization; Another example is the division of decimals, especially when the divisor is a decimal. The mistake is that when the divisor becomes an integer, the divisor does not expand the same multiple at the same time, resulting in a wrong quotient. So we should strengthen the training of basic calculation skills in calculation practice
(3) memorize common data to improve the calculation speed
in the four arithmetic operations, if students memorize some common data, it will not only help students to achieve the requirements of "correct and rapid", but also help them master the skills of calculation. For example: special data with sum and proct of whole hundred and thousand (for example: 75 + 25 = 100 + 25) × 4=100 125 × 8=1000 The proct of the approximate value of PI 3.14 with one digit and the proct with several common numbers 12, 15, 16, 25 and 36; The denominator is the decimal value of the simplest fraction of 2, 4, 5, 8, 10, 16, 20 and 25, that is, the interaction of these fractions and decimals
the results of the above numbers, whether in daily work or in real life, are used very frequently. After mastering and remembering them, they can be transformed into abilities and proce high efficiency in calculation
3
after mastering the calculation method, students tend to deal with the boring calculation, resulting in more calculation errors. At this time, the proper development of some computing competition activities, often can better mobilize the students' learning initiative, improve the interest in computing, and achieve the purpose of improving the accuracy of computing. This semester, I plan to carry out two calculation competitions in the class, in order to improve the students' interest in calculation and improve the accuracy of calculation. After the competition, pay attention to sort out the students' mistakes, analyze and classify them, and then make targeted remedies, so as to clear the obstacles for improving the students' computing ability
4. Encourage students to have a pleasant learning experience
teachers should encourage students to make mistakes e to carelessness. In the usual homework correction, we should affirm its strengths, enhance self-confidence, put forward ardent hope, and urge it to correct its shortcomings< 5. Expected effect
1
2. Cultivate students to participate in the derivation of rules and formulas, and truly clarify the calculation
3. Help students memorize common data and improve the calculation speed
4. Pay attention to the analysis of wrong cases and suit the right medicine to the case
5. Cultivate students' habit of checking calculation consciously and correcting mistakes independently
6. Cultivate students' habit of summarizing and reflecting.

2. 1、 Cultivate students' interest in calculation
simple calculation is often boring and students are easily bored. Therefore, according to the psychological characteristics of the lower grade students who are active and competitive, we can use a variety of training forms to replace the previous single form of practice. For example: training with games, competitions, etc; Driving trains, rushing to answer questions, breaking through barriers, etc. Various forms of training, not only stimulate students' interest in learning, but also make every student actively participate, so as to get twice the result with half the effort. Senior students can explain the principle of problem-solving more, let students understand the context of problem-solving ideas, know the reasons for this problem-solving, deepen the understanding, will improve interest< Second, pay attention to the training of oral arithmetic
oral calculation is the basis of written calculation, which requires not only accuracy but also speed. The formation of oral arithmetic skills and the improvement of speed can not be achieved by one or two days of training, but by constant training. In my opinion, the effect of mental arithmetic three minutes before class is very good. Before each class, prepare ten oral arithmetic questions for students to rush to answer, or let students write in a small book, check the answers in a unified way, make a summary every other time, and praise and reward the excellent students. The enthusiasm of students has been improved, and at the same time, they will pay attention to the correct rate. Of course, remember some common values, such as 2 π、 three π、 four π……， 112, 122, 132... And so on, which have a very good effect on speeding up the speed and accuracy of oral calculation< Third, strengthen the training of estimation
many problems in daily life don't need very accurate results, so we can use estimation to solve them. In this way, the speed is accelerated, and it does not affect the actual operation. When encountering such problems, let the students estimate as much as possible. In addition, even in the calculation of accurate results, the estimation will also play a monitoring role. Every time we finish a question, we can use the method of estimation to verify its correctness< 4. Pay attention to quick calculation and skillful calculation. Quick calculation and skillful calculation, that is, we usually say simple operation, the correct use of simple methods, on the one hand, can improve the speed of problem solving, on the other hand, can also make problem solving simple, improve students' self-confidence. The teacher can teach some basic laws first, let the students answer the questions, in the example of some calculation problems, let the students find the appropriate simple method. This requires students to have a clear grasp of the basic law of operation, especially the scope of its application. For example, multiplication has distributive law, but division does not. This requires students to divide by a number into its reciprocal, in the use of distribution law for calculation< 5. Develop good habits
we know that most of the time, students do not know how to calculate, but they wrong numbers, recite wrong multiplication formulas, or make mistakes in decimal points. These are tiny mistakes, but they often occur. Therefore, the usual practice should be strict, so that students develop a good habit of calculation. The first is to train students to be serious, meticulous, neat and standard. After careful calculation, we must emphasize checking calculation. There are many checking methods, such as checking step by step; It uses addition to check subtraction, multiplication to check division; Put it into the original question to check whether it is in line with the reality; It can also be checked by the above-mentioned estimation. Regular error correction training can also rece students' careless errors to a certain extent. Display the mistakes you are prone to make one by one, and compare them with your own reality. If you have them, you can correct them. If you don't have them, you will make fewer mistakes next time
in a word, computing teaching is a long-term and complex teaching process, and improving students' computing ability is not a matter overnight. Although the above points are not comprehensive, I believe that as long as we can seriously implement the above points, it will play a certain role in improving our computing power.

3. The title of love ecation makes me think about what love is in this diverse world. With this thinking, I trudged with an Italian primary school student to explore an unknown answer. Love, like air, is always ignored by us because it is invisible every day. In fact, its meaning has been integrated into life, just like parents' love, When we are in trouble and no one supports us, it is our parents who are still with us. At night, we don't forget to tell them to go to bed early, I realize that parents all over the world have a deep love for their children. Amrico has a diary that they read and write with their parents, but now many students still have a small lock on their diary. The simplest things are most easily overlooked, just like the deep love between parents and children in this great love, which many people can't feel. If love is a travel, some people may have objections. But love has no end, Happy travel. Just like life, if we regard life as a sentence, people will do heavy work for the sake of one day's release and detachment; On the contrary, if you look at life as a tour, you will feel relaxed and enrich yourself with new things every day. Therefore, you want to go on, even put in enthusiasm, and don't care how long it will last. At this time, this feeling has been sublimated into a kind of love, a kind of love for life, I went into the life of amrico, I went into the life of amrico, and I saw how they learned, lived and loved. In the moving, I found that love contains the pursuit of life. If love is a galloping blood and a jumping heart, then I think it is a noble love for the country; Slogan & quot;, But as a person with conscience, this kind of love should be firmly embedded in our hearts. When I read the moving scenes of Italian people blowing up their legs for their country and defending their homeland, I can't help thinking that our motherland was also soaked with the blood of the Chinese people, Love is great because it is not only for indivials, but also for the dignity and emotion of the whole nation. In the ecation of love, love is compared to many things, which is true and not only these; What is love; There won't be a definite answer, but I have completed my thinking about love - love is great, infinite, great power. Doing housework for my mother this summer, the teacher left a special assignment --- to experience my parents' working life. I'm talking about summer vacation, so I can't let myself be idle. Slowly, used to do some housework, for mom and dad to share. I told my mother about my homework, and my mother also said that your teacher's idea is very good! I'll set up a job for you! And do not only once, you are teachers, a stay on the serious homework, usually do not do. You're going to give me a summer vacation this time. The first is to mop the floor. Just mop it twice. My mother didn't think this job had much weight, so I got an extra job - washing dishes. I will show my hands in the kitchen, and I will take the initiative to wash my parents' feet. I like washing dishes best. Just out of the pot of food on the plate is delicious, and we finished eating, leftovers piled up in the pool, is the resie. The next day when washing dishes, it may be not adapt to it, leftovers taste particularly bad. For this reason, I wear plastic gloves to wash the dishes, and the dishes are full of oil stains. There are also some leftovers lying lazily on the plate and thrown into the garbage can, which makes people cover their nose. I'm just looking forward to it. Wash it quickly. It looks clean on the surface. With such a reluctant mood, I washed the water once or twice. Slowly, I accepted the smell and didn't feel bad. I don't need gloves when I wash the dishes. I'm just imagining that I'm going to bathe the bowls and plates, remove the stains from them, and put on a brand new and clean look. My hands itch when I see my mother cooking. I said to my mother, "let me help you cook today." Then he rolled up his sleeve and washed his hands. I first pour the rice into a small bowl, then pour it into the pot, twist the water tap, connect a small half, and start to wash the rice by hand. After washing the rice three times like this, I pour the water, and then put the rice on the fire to make the water less than one centimeter. At this time, I began to cook. What do I do? By the way, make fish flavored shredded pork! My mother helped me prepare the carrots and asparagus, and also helped me find a small knife. I began to cut the carrots. First, I cut them into pieces, and then cut the carrots into two pieces. The same is true for asparagus and shredded meat. But the shredded meat is a little difficult to cut. When it's all ready, it's time to do it, Pour a little oil, then put the sauce in, stir fry twice, and then put the shredded meat in, stir fry twice, accidentally, my hand touched the pot, I immediately cried with pain, my mother quickly took the shovel, let me use cold water to wash my hands, I thought: cooking this thing looks very common, it is not easy to do it! This reminds me of one thing that happened last week... Last Sunday, our family had dinner early. My mother, who had been tired all day, began to wash the dishes according to the original plan. So I made up my mind to realize this wish today. Just when my mother was still washing her teeth, I had prepared a basin of hot water full of love for her early. I quietly went to her mother and said happily, "Mom, let me wash your feet today and do my filial ty.". Mother felt very confused after listening, said: "daughter, how did you suddenly grow up today and learn to be filial to your parents.". I said: "Mom, this is the result of Teacher Ecation in school. You helped me to do a lot of things before. Today it's my turn to repay you.". After listening to her mother, she said with a smile: "daughter, if you have this filial piety, your mother will be satisfied. You'd better try to do well in your study. That's the best reward for your mother.". I said, "no, I have to wash your feet myself today.". My mother saw that I was very tough and had to comply. I put down the basin, put my hand into the water, measure the temperature of the water to see if it is suitable for washing feet, feel a little hot, I added some cold water. Then help her take off her socks and start to work. From the front of her feet to the back of her feet, from the back of her feet to the soles of her feet, I gently rubbed her feet and found that there was a thick cocoon on the soles of her feet. I knew that she worked too hard for me, and I admired my mother more. After a while, I washed her feet clean, mother smile, "this is the first time I met this kind of happiness.". I immediately replied, "Mom, when I grow up, I will do more for you." In this holiday, I did a lot of housework, which proved that I grew up and learned to do housework. Although I have been exhausted, but can do housework for my mother, my heart is still sweet. O(∩_ ∩) O ha ha ~ come on! Books are the treasure house of knowledge. It makes the accumulation and development of human knowledge and culture, and makes the ignorant become erudite; It is it that constantly enriches my mind and brings infinite joy and hope to my life. When I didn't even know a word, I had an indissoluble bond with the book. When I was very young, like other children, I liked to hear my mother telling stories for me with storybooks. Unlike others, I always listen to every story three or four times before I give up. In the kindergarten, the teacher accidentally found that I could tell stories, so he took out a story book for me to read to the children. Just when the teacher was surprised that I could know so many words, she suddenly found that I had taken the book upside down and was staring at it. It turns out that these stories have been "heard" and "recited" since I was a child. With the increase of word recognition, I can finally read by myself. What a happy thing it is! Every time I was alone in a room, with delicious food, I was intoxicated with excellent works, and lost myself in the pages. That kind of happiness was incomparable to any other feeling at that time&# 57348; I'm intoxicated with literature. From 365 nights to Andersen's fairy tales, so many moving stories and kind-hearted images together shape my simple and optimistic character. From red rock to how steel is tempered, I graally realize the meaning of life and find the end result of my soul in those thousand times of indomitable struggle and countless iron soldiers“ The experience of "San Mao" makes me feel more happy in my life, and the allusion of "head hanging beam, cone stabbing stock" always urges me forward&# 57348; Graally, my interest turned to science books. From the first set of Knowledge Series "one hundred thousand whys" I came into contact with, I don't know how many mysteries I have solved and how many fresh knowledge I have learned. The next reading of "network book", "interesting physics" and so on, I can't help but put down my mind and forget to eat and sleep. It should be said that I would never have been so interested in natural science today if I hadn't read eagerly year after year and day after day&# 57348; Books are my closest friends. They give me knowledge and strength. Today, I roam in the sea of books and learning, tomorrow, I will use knowledge to create life. All this, how can we not say that it is the gift of the book - this is the accident between me and the book. Book, what a simple and ordinary eye! However, it occupies a very high position in my mind. In the long river of my memory, there are always "the story of books" in my mind. I have an indissoluble bond with books. Whenever I hold up a book with a book cover, I can't help thinking of the past... How important books are to me! If I believe that life is the first, then books must be second only to life one - ranking second. I used to cry for the book, sad for the book, that may be my attachment to the book. Whenever I look at a book "retirement", I feel extremely sad, it's like digging half of my flesh. I carefully hide the book in the bookcase, I can't bear to dig out my own flesh? From the first time I saw her, there was an inexplicable feeling in my heart: "she was predestined with me." In the days after that, I would try my best to get close to her and try to understand her. After a short time, I graally found that I had fallen in love with her deeply. Perhaps tired of the bitter and tasteless ABC, or to escape the suffocating x + y = 4, I asked her out again and again, from her fragrant title page, to a strange and fresh world. Don't be "there's gold in the book"

4. Eth's total net computing power rose 1.18% today
according to spider mine data, BTC's total net computing power is 165.488eh/s, mining difficulty is 23.14t, current block height is 678382, and theoretical profit is 0.00000603/t/day. The total network computing power of eth is 524.120th/s, the mining difficulty is 6788.56t, the current block height is 12202704, and the theoretical profit is 0.00435137/100mh/day. The calculation power of BSV network is 0.663eh/s, the mining difficulty is 0.09t, the current block height is 682075, and the theoretical profit is 0.00135756/t/day. The calculation power of BCH whole network is 1.499eh/s, the difficulty of mining is 0.22, the current block height is 682449, and the theoretical income is 0.00060030/t/day
the Xueshuo innovation blockchain Technology Workstation of Lianqiao ecation online is the only approved "blockchain Technology Specialty" pilot workstation of "smart learning workshop 2020 Xueshuo innovation workstation" launched by the school planning, construction and development center of the Ministry of ecation of China. Based on providing diversified growth paths for students, the professional station promotes the reform of the training mode of the combination of professional degree research, proction, learning and research, and constructs the applied and compound talent training system.

5. Primary school as the stage of enlightenment ecation, the level of computing ability directly reflects the quality of a student's mathematics performance. In addition to the teacher's teaching, parents in improving their children's computing ability, might as well try the following methods
first, to strengthen the training of oral arithmetic is the key to improve the ability of calculation
oral arithmetic is the basis of all calculations. Only when children are proficient in oral arithmetic, can they have a good calculation ability. Therefore, parents may as well let their children insist on doing oral arithmetic every day. The content of mental arithmetic includes the mental arithmetic problems in this book and the basic mental arithmetic content learned before. Let the children practice it repeatedly. For example: let the child do 20 oral arithmetic questions every day, and set the calculation time for the child, and find the reason for the wrong questions, so that the child's calculation ability will be improved step by step
the addition and subtraction method within 10 in the first grade is very important, which is the premise of learning mathematics well in the future, and we must let children lay a solid foundation. Carry addition within 20, abdication subtraction, multiplication formula... These are the basis of future calculation. If you want to have a solid foundation, you must be very skilled, fast and accurate
Second, cultivate children's quality of care and patience, and develop the habit of serious and meticulous calculation
a large number of facts show that the lack of serious learning attitude and good learning habits is one of the important reasons for children's calculation errors. Therefore, to improve children's computing ability, we must pay attention to the cultivation of good computing habits, so that children have a rigorous, serious, meticulous learning attitude and the spirit of perseverance, the courage to overcome difficulties, do not use "a moment of carelessness" to forgive children's errors in calculation. So what habits should children develop in calculation
1. Cultivate the habit of serious examination. For practical problems, most of the children can seriously examine the problem, but for calculation problems, some children are not. In addition, the calculation is monotonous and boring, which is easy to cause psychological fatigue. If you encounter similar or similar numbers and symbols, you often have wrong operation order, wrong symbols or wrong data. When cultivating children's habit of serious examination, let them pay attention to the following three points: first, examine numbers and symbols, and observe their characteristics and internal relations; Second, it is necessary to examine the order of operations and make clear what is calculated first and then; Third, we should examine whether the calculation method is reasonable and simple, and then start to solve the problem
2. Cultivate the habit of careful examination. Check carefully and patiently, and check one by one. First, look up the number symbol, second, look up the calculation process. It can be summarized as the calculation habit of "one step, one turn back". In the calculation, one step, one turn back, one check. Check whether the numbers and symbols are copied correctly, whether the number is accurate, etc., and ask children to calculate patiently and carefully according to various corresponding calculation rules, so as to overcome the problem of carelessness
3. Cultivate the habit of standardized writing. Train children to be patient, not impatient, think seriously, and be cautious even when doing simple calculation problems. The calculation process should be written neatly and the format should be standardized. The calculation on the draft paper should also be written clearly to facilitate inspection. Pay attention to the standard of homework, let the children write according to the format, the handwriting is correct, not scribbled, not altered, not pasted, keep the homework neat and beautiful
4. Cultivate the habit of checking and estimating. This is the guarantee of correct calculation. Checking calculation is a kind of ability as well as a habit. First of all, we should master the methods of checking and estimating; Secondly, the checking calculation should be regarded as an important part of the calculation process; Thirdly, the child should master how to use estimation to test the correctness of the answer
Third, strengthen the family school contact, and jointly improve children's computing ability
parents should pay more attention to communicate with teachers to understand their children's learning situation in school, the accuracy of homework, and the problems in computing ability. Only with the joint efforts of parents and teachers can we get twice the result with half the effort
to improve children's computing ability, we need to be regular, planned and step-by-step, speed in time, density in quantity, flexibility and novelty in form and content. Only by persevering can we achieve good results.

6. In primary school mathematics teaching, the level of students' computing ability directly affects the quality of teachers' teaching and students' learning. Therefore, to improve students' computing ability has become one of the important topics in primary school mathematics teaching. In order to effectively improve the calculation ability of primary school students, it is necessary to take a variety of measures and methods. Therefore, the simple calculation ability is formed on the basis of the students' number sense development and strong calculation ability, and the improvement of simple calculation ability can promote the development of students' number sense and the enhancement of calculation ability. How to improve students' ability of simple calculation
first, pay attention to oral arithmetic to cultivate students' thinking agility
accurate and rapid problem-solving thinking activity is an important manifestation of thinking agility. Grasping the basic training of oral arithmetic can improve the students' ability of applying the rules. There are two points that should be paid attention to in oral arithmetic: first, it is not concive to the improvement of oral arithmetic ability and the cultivation of students' thinking agility. Second, there should be a speed requirement in calculation, so that students have a sense of urgency. It's a good way to do mental arithmetic training with slats
Second, to grasp the whole, to cultivate students' thinking flexibility
the flexibility of thinking reflects the flexibility of thinking activities in many aspects, such as the choice of angle, application method and development process. Mainly focus on the following aspects of training 1) Make it up. It is to make up the number into the whole ten, the whole hundred and so on, and then calculate. That is to use rounding method to add and subtract more or add more and subtract more 2) Points. It is to separate one number in the operation and operate with another number respectively to facilitate rounding operation 3) Estimate. Estimation can improve students' self-examination ability, improve the accuracy of quick calculation, and cultivate students' thinking flexibility. In general, some numbers are estimated to be the nearest tens or hundreds. First estimate the result, and then make an accurate answer. Secondly, the estimation test is used
Third, to ince frequently, to cultivate the profundity of students' thinking and the profundity of thinking
refers to the abstract and logical level of thinking activities. We should focus on the following aspects of training 1) All right. According to the characteristics of rounding, two or more numbers are combined to facilitate oral and mental calculation 2) Turn. Transform the operation method, simplify the complex, promote the mental calculation. Guide students to summarize the rules, deepen the understanding and memory of knowledge 3) Change. That is to change the operation order and change the invariant value. According to the definition of the rule, change the operation symbols and data, so as to make the students master the knowledge. One is to grasp the inverse operation, the other is to master the special nature, deepen the deep understanding of the topic, so as to cultivate students' profound thinking and improve their ability of skillful calculation< Fourth, set up the questions to cultivate the originality of students' thinking
the originality of thinking is generally characterized by being thoughtful, innovative and unique. Mainly grasp the following skills for training
1. According to the particularity of 0 and 1 in operation, the calculation steps are omitted, so as to cultivate students' unique innovative thinking
2. Eliminate the two corresponding numbers (such as + 3 and - 3), rece the operation steps, and cultivate students' innovative thinking
in short, in primary school mathematics teaching, students' computing ability can not be developed overnight. As a teacher, first of all, he should be able to use the calculation rules and laws freely, so that he can be handy and improve the effect. At the same time, the training should be carried out persistently. It is difficult to achieve results by fishing for three days and drying the net for two days. In the teaching of calculation, we should constantly think and explore. We should not just calculate for the sake of calculation, but combine it with the actual life and emotional attitude advocated by the new curriculum standard, so as to avoid the monotony and dryness of calculation. Therefore, only through simple operation and paying attention to the cultivation and training of students' thinking ability can we effectively improve the teaching quality and promote the improvement of students' operation skills

7. 1. Students generally feel that the accuracy of calculation will decline after they are separated from the scientific calculator
the inaccuracy of operation is largely e to the lack of deep understanding of basic concepts, the lack of thorough grasp of basic formulas and rules, and the lack of proficiency in their application. Therefore, in teaching, teachers should consciously and systematically equip some exercises without using calculators. When students are proficient in the application of concepts, formulas and rules, and their accuracy is guaranteed, they may as well use calculators again. The calculator as a learning aid, so as to liberate students from the operation, into the study of other problems
2. The effect of using calculator on flexibility
calculation should be reasonable, simple, skilled and fast, which requires students to be flexible in calculation and quick in thinking. The improvement of this ability requires students to observe and think about problems from many aspects, angles and directions. The scientific calculator can quickly solve the complicated calculation, if students blindly use the calculator, they will simply and mechanically input the data to solve, without thinking about how to solve the problem quickly and concisely. The lack of training in this area means that we have lost the effective way to improve our computing ability. I think we can have a class (or several classes) of using calculators to solve problems after a certain part of the content is finished. Before that, calculators are not allowed to be used. For example, in the seventh grade, some students use calculators to solve problems after adding rational numbers, and some use calculators after subtraction. It's better to finish the basic course, and then have calculators after students practice. Or, when encountering this kind of problem, such as calculating 18.75-15.39 + 1.25-14.61, students are required to solve it in a simple way, so as to consciously help students to calculate flexibly, reasonably and simply
3. The impact of using calculator on strictness
when using calculator, the calculation process is generally omitted. However, whether it is the usual requirements or the examination, the problem-solving process is required to be complete and standardized. In fact, this is the embodiment of the thinking process. Due to the lack of training in the use of calculators, the students' problem-solving is not standardized and complete, which is a serious defect and is very unfavorable to the improvement of students' mathematical thinking and mathematical quality
4. The influence of using calculator on mathematical thinking and psychological quality
operation plays a significant role in cultivating students' scientific way of thinking and forming good thinking habits and psychological quality. If students use scientific calculators excessively, they will be unwilling to spend time thinking and doing standard calculations, so as to engage in them rashly. As time goes by, thinking is not orderly and chaotic, and calculation is graally unfamiliar. In addition, we have formed the bad habit of carelessness and carelessness, and lack the training of will and perseverance. At the same time, some students are only used to one-way, single-level operation, used to forward calculation, not used to multi-directional, multi-level operation, not used to reverse operation. Without the scientific calculator, students have to pay attention to the direction and skills of calculation, so as to form the habit of looking ahead and looking after the whole situation. Through long-term training, students' mathematical thinking ability and confidence and perseverance are improved
the tradition of Chinese ecation attaches importance to the training of basic skills. Chinese students often have a solid foundation, and some American College Students' computing ability is not as good as Chinese middle school students. However, the advantage of basic skills of computing ability is less and less obvious for high school students nowadays. A senior high school mathematics teacher said: "many colleagues have such a feeling. Now, as soon as they go to senior one, they have to make up for the calculation for the students. Teachers and students feel that it's hard." A high school student's parents said: "because calculators can be used in the high school entrance examination, but they are not allowed in the college entrance examination, so my son should give up calculators first after he goes to high school. Because of his long-term dependence on calculators, his son doubted his ability of oral and written calculation, and was not at ease with the results of calculation. It's a waste of time. After more than a year, I finally gave up the calculator. " This kind of phenomenon is also the place that I feel puzzled. Why can I use calculator in senior high school entrance examination, but not in college entrance examination? How can students adapt to this change as soon as possible< In a word, with the rapid development of science and technology in the information society, the use of computers and scientific calculators is becoming more and more popular. How can we turn a blind eye to middle school mathematics? Can the field of mathematics ecation sit still? The use of calculators is no longer an economic problem, but an inevitable result of social progress and scientific and technological development. But the use of calculators also weakens the students' computing ability and affects the improvement of students' mathematical quality. We must guide students to use calculators reasonably. On the one hand, we should ensure the improvement of calculation ability, on the other hand, we should be able to operate calculators skillfully.

8. 1、 Stimulating interest is the premise of cultivating students' computing ability