Ab initio calculation
Publish: 2021-04-16 16:20:03
1. AI has a lot to do with computing power. The driving force to promote the development of artificial intelligence is algorithm, data and computing power. These three elements are indispensable, which are the necessary conditions for the achievement of artificial intelligence
in terms of computing power, we know that after we have data, we need to train and train constantly. Because it's not good to train the training set from the beginning to the end. It's just like saying a truth to a child. I'm sure I won't learn it again, except for the prodigy who never forgets. In addition to training, AI actually needs to run on hardware and reasoning, all of which need computing support
so artificial intelligence must have computing power, and with the development of more and more intelligence, more and stronger computing power is needed.
in terms of computing power, we know that after we have data, we need to train and train constantly. Because it's not good to train the training set from the beginning to the end. It's just like saying a truth to a child. I'm sure I won't learn it again, except for the prodigy who never forgets. In addition to training, AI actually needs to run on hardware and reasoning, all of which need computing support
so artificial intelligence must have computing power, and with the development of more and more intelligence, more and stronger computing power is needed.
2.
We live in the era of data. All data services can't do without the support of computing power. The application fields of computing power platform are very wide. I'll send you two pictures to see< br />
3. Staadchina is very good, but it is more difficult to learn
4. BSC BTS
is called ABIS port
BTS and MS
is called um port, that is, air interface
there are actually two interfaces between BSC and MSC, because there is also a TC mole, and the two interfaces are ater port and a port respectively.
is called ABIS port
BTS and MS
is called um port, that is, air interface
there are actually two interfaces between BSC and MSC, because there is also a TC mole, and the two interfaces are ater port and a port respectively.
5. First of all, the computing power needs to be trained repeatedly
6.
Hello, I'm xiaoxinjun from Tianjin New Oriental junior high school.
the calculation ability reflected by the current students in their study is worrying. There are often calculation errors, and the calculation ability of students is generally poor, which directly affects their mathematics performance. Combined with my personal teaching practice, I think it should be divided into the following two different situations, take different countermeasures to improve students' computing ability
-
it's not a careless problem, some calculation rules are not mastered, and the foundation is not strong enough
< / OL > -
strengthen the training of operation skills, and only by more practice can they be more proficient. Sometimes, if you don't choose the right method, the problem that can be solved by a simple method is complicated, which naturally leads to a greatly increased error rate
-
strive to cultivate good computing habits. For example, let the students who don't like to make drafts find out the special draft paper, seriously make the drafts, and the students who don't have the habit of checking try to cultivate the habit of checking. When people, each student's situation is different, many times I also ask students to do some calculations directly in front of me, so that they can see the problem more clearly, solve the problem more timely, and directly improve the accuracy of the problem
< / UL >
many students, including parents, think that calculation problems are just careless problems, but they are not. Some students may not lay a good foundation for calculation in primary school, and it is difficult to add, subtract, multiply and divide, and they make repeated mistakes in junior high school. Sometimes calculation problems are far more than careless problems. It may be that students don't know the four mixed algorithms of addition, subtraction, multiplication and division. It may be that the memory of multiplication formula is not accurate and the root causes of the problems are uneven. Therefore, first of all, we need to make a comprehensive survey of students to understand what problems they have in the calculation, and then give targeted guidance, Aim at the source of these calculation errors, suit the remedy to the case, so as to get rid of the illness, rece the calculation errors, and graally improve the calculation ability
of course, many students recite the multiplication formula and master the four algorithms. Most of these students' calculation errors are caused by carelessness, and this part of students will generally suggest:
this summer vacation is a good time for you to surpass your classmates. I hope you can practice more and do more questions, or learn from our teacher how to improve your learning and computing ability. Don't underestimate the problem of calculation. Carelessness can lead to great tragedy. Now the college entrance examination is really a point difference, and your ideal school missed. To improve your computing power, we must start from the beginning, from the foundation
Thank you~7. The poor computing ability may be e to the fact that you are not careful enough when doing the problem. You always think that the problem can be done as soon as you see it, and then you are excited to finish it quickly. As a result, you make a mistake because you miss a certain mathematical symbol. So you should be patient, write slowly when you do the questions, and check again after you finish, so that the probability of making mistakes will be reced. In addition, you should calm down in the third stage of junior high school, don't worry too much, do the wrong topic several times, and reward yourself when you do the right topic, so as to increase your self-confidence.
8. 1. Combine theory with practice to stimulate students' interest in learning
an essential part of mathematics calculation teaching in primary school is the practice from different angles for a knowledge point. We can introce some phenomena in real life into mathematics application problems. Mathematics learning, like Chinese learning, needs to build a good classroom background for students to carry out classroom teaching more effectively. In the stage of decimal mathematics, although the overall difficulty of mathematics is not big, but it involves many branches of content, basically covering the commonly used mathematical calculation, geometric calculation, fraction calculation in our life, the amount of information is still very large. At the same time, the characteristics of primary school students are more active, if the teaching method is too boring, it is not easy for students to understand. Mathematics should also be vivid and specific. In the process of class, teachers can combine with the actual situation to demonstrate the mathematical knowledge to students. For example, after studying the fifth grade mathematics volume I "decimal multiplication" and "decimal division" published by people's ecation press, you can ask the students how many hours it takes to pave a section of highway with asphalt for 2.5 hours and 50 meters? Through the students to solve this problem, not only consolidate the knowledge, but also exercise the students' thinking and analysis ability and the ability of column calculation, so it is better than the simple 50 ÷ 2.5 this kind of calculation problem is more concive to the improvement of students' comprehensive quality of mathematics. In teaching, we can make use of the students' active and competitive psychology to design some mathematics games, such as: driving a train, winning the red flag, mathematics turntable, poker games, etc., which stimulate students' interest in learning, encourage each student to actively participate in, and receive good results
2. Be flexible and draw inferences from one instance
in the teaching of calculation, we should make students learn to be flexible and draw inferences from one instance; For example, the content of the textbook is relatively simple, and we need to turn the problem of tree planting into various questions, such as:
(1) number of trees: there is a 1600 meter long highway, and how many saplings are needed to plant a tree every 20 meters from the beginning to the end of the highway
(2) spacing: trees are planted on both sides of a 250 meter long road, both at the beginning and the end. A total of 101 trees are planted, and the distance between each two adjacent trees is equal. Do you know how many meters it is
(3) total length: 95 trees are planted on one side of a section of road, both ends of the road, and the distance between each two trees is 5 meters. How many meters is the total length of this section of road
(4) closed graph: a willow tree is planted every 2 meters around a circular pool, and a total of 40 trees are planted. How many meters is the perimeter of the pool
through various comparisons, students can learn by analogy and grasp the useful known conditions in the problem stem. Teachers should take the problem-solving process as the most important teaching content in the whole teaching process, so that students can know how to think and why to think in the process, and then compare their own thinking process, so as to improve their logical ability, Cultivate mathematical thinking ability
3. Simple calculation method is used to improve the operation efficiency
the potential of primary school students needs to be guided and stimulated by teachers, especially in the way of thinking and problem solving. In the teaching of mathematics calculation in the fifth grade of primary school, teachers need to teach students a clear idea to solve problems, and at the same time, they should pay attention to cultivate students' serious study of problems. In the teaching of calculation, simple calculation should be appropriately adopted to enable students to master regular knowledge and pay attention to inction and summary. One of the most important aspects is the application of simple algorithm. For example, in the fifth grade of PEP school Volume I decimal multiplication exercise, 9.5 × 11. This kind of calculation problem, many students still according to the original calculation method, using column and multiplication formula to carry on the tedious operation, although the result is correct, but it is a waste of time and energy. So you can use a simple algorithm. For example, in the example just now, you can decompose 11 into 10 plus 1, and then multiply them with 9.5, and add the results together to calculate the result accurately. Of course, if you have enough time in the exam, you can use column type to check and improve the accuracy. For primary school students, a big mistake in learning mathematics lies in the treatment of headache and foot pain, which is a very common mistake. Only from the operation of logarithm, we see the importance and possibility of analogy. If you want to calculate the value quickly, you should be able to estimate, judge, check and move the decimal point skillfully
4. Grasp the details and cultivate good study habits
many middle school students tend to be careless in calculation, lack of self-examination ability, and details determine success or failure. To improve their calculation ability, correct learning attitude and good learning habits are indispensable. Therefore, our teachers must start from every bit and strictly require students to listen to the class carefully, read the questions carefully, and finish their homework conscientiously and independently. Not easy to ask others or eager to get results. And let students set up "can do the problem must not be wrong" thought. We should do our homework carefully and neatly. The standard writing format can easily record the calculation methods, steps and ideas, and prevent the wrong writing of numbers and operation symbols. At the same time, we should cultivate students' habit of using draft paper when they calculate, and write clearly to facilitate examination. The habit of checking calculation can greatly improve the accuracy of homework. There are many methods for checking calculation, among which the inverse operation is one of the effective methods. Of course, many of the mathematical problems can be solved by one problem and many methods can be used to improve the accuracy
in the process of teaching, teachers "teach fish, not teach fish", combine theory with practice, stimulate students' interest in learning, through flexible questions, let students draw inferences from one instance, use simple calculation methods in the process of calculation, improve the efficiency of calculation, and cultivate students to develop the habit of consciously checking and correcting mistakes, For the future study and life to lay a good foundation.
an essential part of mathematics calculation teaching in primary school is the practice from different angles for a knowledge point. We can introce some phenomena in real life into mathematics application problems. Mathematics learning, like Chinese learning, needs to build a good classroom background for students to carry out classroom teaching more effectively. In the stage of decimal mathematics, although the overall difficulty of mathematics is not big, but it involves many branches of content, basically covering the commonly used mathematical calculation, geometric calculation, fraction calculation in our life, the amount of information is still very large. At the same time, the characteristics of primary school students are more active, if the teaching method is too boring, it is not easy for students to understand. Mathematics should also be vivid and specific. In the process of class, teachers can combine with the actual situation to demonstrate the mathematical knowledge to students. For example, after studying the fifth grade mathematics volume I "decimal multiplication" and "decimal division" published by people's ecation press, you can ask the students how many hours it takes to pave a section of highway with asphalt for 2.5 hours and 50 meters? Through the students to solve this problem, not only consolidate the knowledge, but also exercise the students' thinking and analysis ability and the ability of column calculation, so it is better than the simple 50 ÷ 2.5 this kind of calculation problem is more concive to the improvement of students' comprehensive quality of mathematics. In teaching, we can make use of the students' active and competitive psychology to design some mathematics games, such as: driving a train, winning the red flag, mathematics turntable, poker games, etc., which stimulate students' interest in learning, encourage each student to actively participate in, and receive good results
2. Be flexible and draw inferences from one instance
in the teaching of calculation, we should make students learn to be flexible and draw inferences from one instance; For example, the content of the textbook is relatively simple, and we need to turn the problem of tree planting into various questions, such as:
(1) number of trees: there is a 1600 meter long highway, and how many saplings are needed to plant a tree every 20 meters from the beginning to the end of the highway
(2) spacing: trees are planted on both sides of a 250 meter long road, both at the beginning and the end. A total of 101 trees are planted, and the distance between each two adjacent trees is equal. Do you know how many meters it is
(3) total length: 95 trees are planted on one side of a section of road, both ends of the road, and the distance between each two trees is 5 meters. How many meters is the total length of this section of road
(4) closed graph: a willow tree is planted every 2 meters around a circular pool, and a total of 40 trees are planted. How many meters is the perimeter of the pool
through various comparisons, students can learn by analogy and grasp the useful known conditions in the problem stem. Teachers should take the problem-solving process as the most important teaching content in the whole teaching process, so that students can know how to think and why to think in the process, and then compare their own thinking process, so as to improve their logical ability, Cultivate mathematical thinking ability
3. Simple calculation method is used to improve the operation efficiency
the potential of primary school students needs to be guided and stimulated by teachers, especially in the way of thinking and problem solving. In the teaching of mathematics calculation in the fifth grade of primary school, teachers need to teach students a clear idea to solve problems, and at the same time, they should pay attention to cultivate students' serious study of problems. In the teaching of calculation, simple calculation should be appropriately adopted to enable students to master regular knowledge and pay attention to inction and summary. One of the most important aspects is the application of simple algorithm. For example, in the fifth grade of PEP school Volume I decimal multiplication exercise, 9.5 × 11. This kind of calculation problem, many students still according to the original calculation method, using column and multiplication formula to carry on the tedious operation, although the result is correct, but it is a waste of time and energy. So you can use a simple algorithm. For example, in the example just now, you can decompose 11 into 10 plus 1, and then multiply them with 9.5, and add the results together to calculate the result accurately. Of course, if you have enough time in the exam, you can use column type to check and improve the accuracy. For primary school students, a big mistake in learning mathematics lies in the treatment of headache and foot pain, which is a very common mistake. Only from the operation of logarithm, we see the importance and possibility of analogy. If you want to calculate the value quickly, you should be able to estimate, judge, check and move the decimal point skillfully
4. Grasp the details and cultivate good study habits
many middle school students tend to be careless in calculation, lack of self-examination ability, and details determine success or failure. To improve their calculation ability, correct learning attitude and good learning habits are indispensable. Therefore, our teachers must start from every bit and strictly require students to listen to the class carefully, read the questions carefully, and finish their homework conscientiously and independently. Not easy to ask others or eager to get results. And let students set up "can do the problem must not be wrong" thought. We should do our homework carefully and neatly. The standard writing format can easily record the calculation methods, steps and ideas, and prevent the wrong writing of numbers and operation symbols. At the same time, we should cultivate students' habit of using draft paper when they calculate, and write clearly to facilitate examination. The habit of checking calculation can greatly improve the accuracy of homework. There are many methods for checking calculation, among which the inverse operation is one of the effective methods. Of course, many of the mathematical problems can be solved by one problem and many methods can be used to improve the accuracy
in the process of teaching, teachers "teach fish, not teach fish", combine theory with practice, stimulate students' interest in learning, through flexible questions, let students draw inferences from one instance, use simple calculation methods in the process of calculation, improve the efficiency of calculation, and cultivate students to develop the habit of consciously checking and correcting mistakes, For the future study and life to lay a good foundation.
9. How to improve the calculation ability of primary school students is a basic mathematical ability, and it is an important task of primary school mathematics teaching to cultivate primary school students with certain calculation ability. In primary school mathematics textbooks, the proportion of calculation is very large. Some concepts are introced by calculation; The ideas, steps and results of solving mathematical application problems should also be implemented through calculation. The teaching of geometry involves the calculation of perimeter, area and volume. The derivation and application of these formulas are also inseparable from calculation. Simple equations, proportions and statistical charts are also closely related to calculation. So, how to improve the students' calculation level and make the calculation accurate< First, cultivate students' interest in learning mathematics
"interest is the best teacher". In the teaching of calculation, first of all, we should stimulate students' interest in calculation, make them willing to learn and do, and teach them to master certain calculation methods, so as to achieve the goal of correct calculation and fast calculation. Pay attention to the form of training, stimulate interest in computing. In order to improve the students' interest in computing, teaching in fun, pay attention to the diversification of training forms. 1. Develop interest in the game. For example, the introction of mathematical game "touch the ball" in the teaching of low-grade calculation can not only carry out oral calculation practice, but also stimulate students' interest in calculation. 2. Use stories to stimulate interest. For example: before teaching simple operation, first explain the story of mathematician Gauss creatively answering the sum of 100 natural numbers "1 + 2 + 3 +... + 99 + 100", create a good learning situation for students, stimulate their interest in learning mathematics, and students unconsciously have the idea to compare with mathematicians. Typical examples of mathematicians at home and abroad are told with little stories that students like to hear and see, which not only increases the classroom atmosphere, attracts students' attention, but also stimulates students' hobbies and interests in mathematics learning< Second, clarify the calculation and master the algorithm.
calculation is a kind of principle and idea of calculation, and algorithm is a form of expression or writing format of calculation. Calculation should be expressed by algorithm, and algorithm should embody calculation. In the teaching of the new course, the understanding of computing theory is highlighted, and the diversification of algorithms is pursued
1. Use teaching aids and students' hands-on operation to help students understand arithmetic. Some concepts in mathematics, such as the understanding of integers, decimals, fractions and percentages, the laws and properties of operations, and the changing laws of sum, difference, proct and quotient, are the basis of operation rules. But these are abstract mathematical knowledge, and the thinking of primary school students is based on specific image thinking. There is a certain distance between such abstract mathematical knowledge and primary school students' thinking. Therefore, the analysis of calculation theory should be based on the cognitive characteristics of primary school students, through the teacher's "bridge", put the abstract knowledge in the specific image, and graally guide the students' understanding to the other side of the abstract, so as to summarize the calculation rules. In teaching, teachers should choose perceptual materials related to teaching content as much as possible, choose intuitive teaching means, create conditions for students to operate, and lay the foundation for further thinking processing. Visual demonstration and hands-on learning aids are important means to help students perceive and understand abstract mathematical knowledge
2. It is the key to improve students' computing ability to guide them to use the rules accurately and simplify the operation process on the basis of understanding. The process of mastering the algorithm is from the developed and detailed thinking activity to the compressed and omitted thinking activity. Development is to understand, to ensure the accuracy of the initial operation, compression is to simplify the intermediate link, improve the speed of calculation. After students understand and master the new algorithm, when they start training, they should strictly require students to use the algorithm to carry out the operation, and should also require oral calculation process, so as to train students to speak reasonably and act with evidence, so as to ensure the consciousness and correctness of the operation< Third, cultivate students' good computing habits, which directly affect the formation and improvement of students' computing ability. A large number of facts show that the lack of serious learning attitude and habits is one of the important reasons for students' errors in calculation. Therefore, teachers should be strict with students and develop a good habit of calculation
1. Writing should be standardized
the cultivation of good computing habits starts from writing. From the normal teaching practice, many students make mistakes just because of the nonstandard writing format. The standard writing format can express the students' operation ideas, calculation methods and steps, prevent the wrong writing, omission of numbers and operation symbols, and improve the accuracy. In order to make primary school students develop good writing habits as soon as possible, the key is the teacher's words and deeds, set an example, in the subtle influence of training. For example, in class, the design of blackboard writing should be reasonable, standardized and neat, and the writing should be one stroke at a time. Even a small "=" or a horizontal line in the vertical style must be rigorous and standardized. When correcting the homework, the students should write the comments carefully, so that the students can understand and give the children a demonstration. Often, it is concive to cultivate students' serious and meticulous learning attitude, the error rate of calculation will be greatly reced, and the work efficiency of teachers will also be improved
2. Do one look, two think, three calculate, four check when calculating
one look: pupils often make mistakes in the process of calculation. For example, it's either the wrong number or the wrong symbol. Therefore, before making a question, we must first see each number and each symbol completely, and never the wrong question, which is the premise of correct calculation< Second thought: determine the operation steps. In the process of calculation, pupils often do it as soon as they get the problem, and they don't think about its operation steps at all. For example, in the fourth grade of primary school mathematics volume II four operations: 75 + 25 × 4 and 128-28 × These two questions are often done by pupils first to add and subtract, then to multiply. Another example is 9 × nine ÷ nine × 9 this problem is often primary school students think that is a level of operation, how to do can, so there is a first 9 × 9 and 9 × 9, the final result is equal to the wrong conclusion of 1. Therefore, before calculating the four operations, we should first think about the rules of the four operations, what to do first, and then what to do. To see each step clearly is the key to correct calculation< Three arithmetic: it's easy for junior students to forget to carry in addition or to abdicate in subtraction; Or add as subtraction and multiply as division. Therefore, the calculation should be carried out carefully after determining the operation steps
four checks: students can't check every step consciously except checking the prescribed checking questions. Therefore, it should be emphasized that students should "look back" in time after finishing the calculation, check whether it is correct, check the calculation step by step, correct the mistakes in time, and ensure the correct calculation. Inspection should have a clear purpose and strict standards, so that every question must be checked and every step must be checked
3. Cultivate students' habit of simple calculation consciously
the skills of simple algorithm in primary school mathematics can be summed up as "combination, separation and change"“ The technique of "divide" applies to two numbers. For example: 12.5 × 88 is divided into eight × 11 or 80 + 8; When 455 + 398 is simplified, 398 should be divided into 400-2; forty-nine ÷ The simple algorithm of 35 is 49 ÷ seven ÷ 5, etc“ The "combination" technique is applicable to numbers with three or more digits. For example, the formula 4.5 + 7.2 + 5.5 + 2.8 is (4.5 + 5.5) + (7.2 + 2.8); twenty-four × twenty-five × The simple formula is 24 × twenty-five × 4; 15.2-3.6-2.4=15.2-3.6+2.4; one hundred and eighty-nine ÷ two ÷ 5=189 ÷ two × 5; two point five × 4.4+2.5 × 5.6 should be synthesized into 2.5 × 4 + 5.6)“ "Change" is suitable for difficult problems in simple calculation. For example, formula 63 × 111+93 × 999, hard calculation is more troublesome, if you can see the digital characteristics contained in it, it will be 63 × 111 to 7 × nine × 111 is further transformed into 7 × 999, the original formula can be written as 63 × 111+93 × 999=7 × 999+93 × 999=93+7 × 999=100 × 999 = 99900, so you can get the result quickly from the beginning to the end. By constantly asking and checking, students can enhance their awareness of simple calculation, find out all the factors of simple calculation, see deeply, and greatly improve the efficiency of calculation
in a word, the improvement of students' computing ability is not a matter of overnight. In normal teaching, teachers should start from the characteristics of teaching materials, the reality of students and the psychological characteristics of children, and integrate multimedia with real life and game activities, so as to create a learning environment full of children's interest and vitality for students, So that the boring teaching of computing radiates new vitality.
"interest is the best teacher". In the teaching of calculation, first of all, we should stimulate students' interest in calculation, make them willing to learn and do, and teach them to master certain calculation methods, so as to achieve the goal of correct calculation and fast calculation. Pay attention to the form of training, stimulate interest in computing. In order to improve the students' interest in computing, teaching in fun, pay attention to the diversification of training forms. 1. Develop interest in the game. For example, the introction of mathematical game "touch the ball" in the teaching of low-grade calculation can not only carry out oral calculation practice, but also stimulate students' interest in calculation. 2. Use stories to stimulate interest. For example: before teaching simple operation, first explain the story of mathematician Gauss creatively answering the sum of 100 natural numbers "1 + 2 + 3 +... + 99 + 100", create a good learning situation for students, stimulate their interest in learning mathematics, and students unconsciously have the idea to compare with mathematicians. Typical examples of mathematicians at home and abroad are told with little stories that students like to hear and see, which not only increases the classroom atmosphere, attracts students' attention, but also stimulates students' hobbies and interests in mathematics learning< Second, clarify the calculation and master the algorithm.
calculation is a kind of principle and idea of calculation, and algorithm is a form of expression or writing format of calculation. Calculation should be expressed by algorithm, and algorithm should embody calculation. In the teaching of the new course, the understanding of computing theory is highlighted, and the diversification of algorithms is pursued
1. Use teaching aids and students' hands-on operation to help students understand arithmetic. Some concepts in mathematics, such as the understanding of integers, decimals, fractions and percentages, the laws and properties of operations, and the changing laws of sum, difference, proct and quotient, are the basis of operation rules. But these are abstract mathematical knowledge, and the thinking of primary school students is based on specific image thinking. There is a certain distance between such abstract mathematical knowledge and primary school students' thinking. Therefore, the analysis of calculation theory should be based on the cognitive characteristics of primary school students, through the teacher's "bridge", put the abstract knowledge in the specific image, and graally guide the students' understanding to the other side of the abstract, so as to summarize the calculation rules. In teaching, teachers should choose perceptual materials related to teaching content as much as possible, choose intuitive teaching means, create conditions for students to operate, and lay the foundation for further thinking processing. Visual demonstration and hands-on learning aids are important means to help students perceive and understand abstract mathematical knowledge
2. It is the key to improve students' computing ability to guide them to use the rules accurately and simplify the operation process on the basis of understanding. The process of mastering the algorithm is from the developed and detailed thinking activity to the compressed and omitted thinking activity. Development is to understand, to ensure the accuracy of the initial operation, compression is to simplify the intermediate link, improve the speed of calculation. After students understand and master the new algorithm, when they start training, they should strictly require students to use the algorithm to carry out the operation, and should also require oral calculation process, so as to train students to speak reasonably and act with evidence, so as to ensure the consciousness and correctness of the operation< Third, cultivate students' good computing habits, which directly affect the formation and improvement of students' computing ability. A large number of facts show that the lack of serious learning attitude and habits is one of the important reasons for students' errors in calculation. Therefore, teachers should be strict with students and develop a good habit of calculation
1. Writing should be standardized
the cultivation of good computing habits starts from writing. From the normal teaching practice, many students make mistakes just because of the nonstandard writing format. The standard writing format can express the students' operation ideas, calculation methods and steps, prevent the wrong writing, omission of numbers and operation symbols, and improve the accuracy. In order to make primary school students develop good writing habits as soon as possible, the key is the teacher's words and deeds, set an example, in the subtle influence of training. For example, in class, the design of blackboard writing should be reasonable, standardized and neat, and the writing should be one stroke at a time. Even a small "=" or a horizontal line in the vertical style must be rigorous and standardized. When correcting the homework, the students should write the comments carefully, so that the students can understand and give the children a demonstration. Often, it is concive to cultivate students' serious and meticulous learning attitude, the error rate of calculation will be greatly reced, and the work efficiency of teachers will also be improved
2. Do one look, two think, three calculate, four check when calculating
one look: pupils often make mistakes in the process of calculation. For example, it's either the wrong number or the wrong symbol. Therefore, before making a question, we must first see each number and each symbol completely, and never the wrong question, which is the premise of correct calculation< Second thought: determine the operation steps. In the process of calculation, pupils often do it as soon as they get the problem, and they don't think about its operation steps at all. For example, in the fourth grade of primary school mathematics volume II four operations: 75 + 25 × 4 and 128-28 × These two questions are often done by pupils first to add and subtract, then to multiply. Another example is 9 × nine ÷ nine × 9 this problem is often primary school students think that is a level of operation, how to do can, so there is a first 9 × 9 and 9 × 9, the final result is equal to the wrong conclusion of 1. Therefore, before calculating the four operations, we should first think about the rules of the four operations, what to do first, and then what to do. To see each step clearly is the key to correct calculation< Three arithmetic: it's easy for junior students to forget to carry in addition or to abdicate in subtraction; Or add as subtraction and multiply as division. Therefore, the calculation should be carried out carefully after determining the operation steps
four checks: students can't check every step consciously except checking the prescribed checking questions. Therefore, it should be emphasized that students should "look back" in time after finishing the calculation, check whether it is correct, check the calculation step by step, correct the mistakes in time, and ensure the correct calculation. Inspection should have a clear purpose and strict standards, so that every question must be checked and every step must be checked
3. Cultivate students' habit of simple calculation consciously
the skills of simple algorithm in primary school mathematics can be summed up as "combination, separation and change"“ The technique of "divide" applies to two numbers. For example: 12.5 × 88 is divided into eight × 11 or 80 + 8; When 455 + 398 is simplified, 398 should be divided into 400-2; forty-nine ÷ The simple algorithm of 35 is 49 ÷ seven ÷ 5, etc“ The "combination" technique is applicable to numbers with three or more digits. For example, the formula 4.5 + 7.2 + 5.5 + 2.8 is (4.5 + 5.5) + (7.2 + 2.8); twenty-four × twenty-five × The simple formula is 24 × twenty-five × 4; 15.2-3.6-2.4=15.2-3.6+2.4; one hundred and eighty-nine ÷ two ÷ 5=189 ÷ two × 5; two point five × 4.4+2.5 × 5.6 should be synthesized into 2.5 × 4 + 5.6)“ "Change" is suitable for difficult problems in simple calculation. For example, formula 63 × 111+93 × 999, hard calculation is more troublesome, if you can see the digital characteristics contained in it, it will be 63 × 111 to 7 × nine × 111 is further transformed into 7 × 999, the original formula can be written as 63 × 111+93 × 999=7 × 999+93 × 999=93+7 × 999=100 × 999 = 99900, so you can get the result quickly from the beginning to the end. By constantly asking and checking, students can enhance their awareness of simple calculation, find out all the factors of simple calculation, see deeply, and greatly improve the efficiency of calculation
in a word, the improvement of students' computing ability is not a matter of overnight. In normal teaching, teachers should start from the characteristics of teaching materials, the reality of students and the psychological characteristics of children, and integrate multimedia with real life and game activities, so as to create a learning environment full of children's interest and vitality for students, So that the boring teaching of computing radiates new vitality.
10. First of all, don't form the habit of using the computer. If you know that you are careless and lose points, you should slow down the speed of doing the problem. If you are careful in calculation, you should practice more. Math is to do more. After you finish writing a formula and take a look at it, it won't take you much time. Check whether you have copied it wrong. You can have a try. The checking calculation on the draft paper does not need to be very neat, but it should not be too rough. Write in order to recognize it. If you wrong, you can find it. In this way, you don't have to recalculate, but you can find the problem from the draft and correct it in time
2. Many students often make mistakes because of carelessness, but they don't analyze the mistakes carefully, so it's hard to learn from them. When correcting a wrong question, it's not to find out where the mistake is or why it's wrong. It's just to do the wrong question again from the beginning to the end and get it right. In this way, the effect of correcting a wrong question is not great. In my opinion, we should the wrong questions on the wrong questions collection intact, leaving "wrong files"; Carefully check where the mistake is and draw a curve under the mistake with a red pen; Find out the cause of the mistake and write it out. Write it in a specific way, whether the concept is unclear or the wrong formula is used, whether the problem is not understood or the calculation is careless. Don't just write "careless" when it's wrong. Write clearly how careless it is. Copy "+" to "-" or "3" to "5". The more specific, the better. Finally, correct the mistakes and write the correct answers. As for the calculation problem, after you do it again, do it again (don't look at the answers you made before)
write out every step, don't just use your head, finish the problem again and again
come on! Good luck! Improve performance as soon as possible!!!
2. Many students often make mistakes because of carelessness, but they don't analyze the mistakes carefully, so it's hard to learn from them. When correcting a wrong question, it's not to find out where the mistake is or why it's wrong. It's just to do the wrong question again from the beginning to the end and get it right. In this way, the effect of correcting a wrong question is not great. In my opinion, we should the wrong questions on the wrong questions collection intact, leaving "wrong files"; Carefully check where the mistake is and draw a curve under the mistake with a red pen; Find out the cause of the mistake and write it out. Write it in a specific way, whether the concept is unclear or the wrong formula is used, whether the problem is not understood or the calculation is careless. Don't just write "careless" when it's wrong. Write clearly how careless it is. Copy "+" to "-" or "3" to "5". The more specific, the better. Finally, correct the mistakes and write the correct answers. As for the calculation problem, after you do it again, do it again (don't look at the answers you made before)
write out every step, don't just use your head, finish the problem again and again
come on! Good luck! Improve performance as soon as possible!!!
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