28 calculating power

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3. In the twinkling of an eye, I taught from grade one to grade four. Every time I finish a unit, I have to do a small exercise. Originally, the problem of hands-on operation has always been a difficult point for students, and they generally do not master it well. This time, however, the reverse happened. Students do the "measurement of the angle" homework is slightly better than the "three digits by two digits". This may have something to do with my usual training of students' practical ability, but at the same time, it makes me realize the importance of calculation again. So, I calm down, decided to improve the students' computing ability to a new height. Through the later training, students seldom make mistakes in unit 5 division by two digits
first, create a situation for students to pay attention to their thoughts and fully realize the importance of calculation.
I created such a situation: "students, have you ever seen building houses“ Some said "yes."“ What should be the first place to build a house? " At this time, basically no one knows. So, I went on to say, "to build a house, you need to build the foundation first." At the same time, with video, let the children know the process of building houses“ What will happen if the foundation is not firmly laid? " Next, a 13 story building under construction collapsed in Jingyuan community on the Bank of Lianhua River in Shanghai on June 27, 2009. After reading, I continued to talk: "students, the consequences of not laying a solid foundation are serious?"“ Serious. "“ In fact, the calculation in our mathematics is the same as that of the foundation. If we don't do the calculation well, our kingdom of mathematics will collapse just like the building in the picture just now. Therefore, we must do the calculation well, so that our kingdom of mathematics will become more and more brilliant. "< The great scientist Einstein said: "interest is the best teacher." It shows that as long as a person has a strong interest in something, he will take the initiative to seek knowledge, explore and practice, and proce ability in the process of seeking knowledge, exploring and practice, so as to turn low efficiency into high efficiency
(1) to stimulate students' interest in calculation by telling stories about mathematicians when they were young
it is almost common for children to like listening to stories. Among them, I told the students a famous story of Gauss hour: one day when school was about to end in the afternoon, many students in a class were not very disciplined. The teacher intended to punish these children gently, so he put forward a question (natural number from 1 to 100): 1 + 2 + 3 + 4... + 97 + 98 + 99 + 100 = (), and then he went home from school“ Students, can you calculate this problem? " Many children shook their heads“ Then let's listen to the story. " The students quickly took out the paper and pen to calculate, but one child did not do it, as if thinking. Soon the child worked out the answer. The method he used is to sum 50 pairs of sequences (1 + 100, 2 + 99, 3 + 98...) of construction sum 101, and get the result: 5050. The child's name was Gauss, and he was only nine years old that year. Later, Gauss became a famous German mathematician, physicist, astronomer, geometer and geodesist. After listening, the students adore Gauss and have a strong interest in calculation
(2) to stimulate students' interest in calculation by using one problem to do more calculation
in the usual calculation teaching, we should be good at training students' computational thinking ability. For example, when learning multiplication and addition calculation in grade two, there is a problem: it's a calculation problem of looking at the diagram, drawing four plates of peaches, six in each of the first three plates, and five in the fourth plate. How many peaches are there in total? Almost all the children are like this × 3 + 5 = 23 × 3 = 18, then 18 + 5 = 23. At this point, I asked, "is there any other algorithm?" The children are trying slowly. Finally, there are children and a new algorithm: 6 × 4-1 = 23 (pieces). If you take the last set as 6, there will be 4 6, and you will get 24. If you calculate one more, you will lose one, and you will get 23. Then, I asked the students to compare, which one is faster? Students quickly understand that the second algorithm is much faster, which stimulates students' interest in computing< Third, strengthen the cultivation of oral calculation ability
the "Primary School Mathematics Syllabus" points out: "to cultivate students' calculation ability, we should pay attention to basic oral calculation training. Oral calculation is not only the basis of written calculation, estimation and simple calculation, but also an important part of calculation ability." If the ability of oral calculation is strong, the speed of written calculation will be fast, and the accuracy of calculation will be improved. From the first grade, we should pay attention to the practice of addition and subtraction. If we can skillfully calculate the addition and subtraction within 20, it will be of great help to the calculation of multiplication and division. For example, when students learn the unit of "three digits multiplied by two digits", some students make mistakes when they encounter this problem: 389 × 28, the first step is 389 × 8 was originally equal to 3112, but some got 3002, 3222... The problem is that 7 + 4 is not right< Fourth, cultivate good habit of calculation.
French scholar Bacon said: "habit is the master of life, people should strive to pursue good habit." So, to some extent, good habits can determine our destiny. Good calculation habits directly affect students' calculation ability. Often some students can correctly understand and master the calculation rules, but they still make mistakes. The main reason is that they don't form a good habit of calculation< In the first grade, I purposely put out a few questions on the blackboard for students to in the book. The students are required to proofread the copied topics carefully, ranging from numbers and symbols, so as to make sure they are good
2. Develop the habit of examining questions
I ask students to see clearly every data and operation symbol in the questions, determine the operation order, and choose a reasonable operation method< (2) develop the habit of checking calculation
I let the students learn the checking method of addition, subtraction, multiplication and division, and make strict requirements on checking calculation as an important part of the calculation process, and advocate using estimation to check the correctness of the answers
in a word, it's not a matter of a day to improve the fourth grade students' computing ability. We should take it as a long-term work. As long as teachers and students make unremitting efforts together for a long time, the students' computing ability will reach a new level.

4. Hehe, this is the most basic parameter of professional graphics card. The CUDA parallel processor core of q600 is 96.

5. Always lose? If you have extra money, help him return it. If you don't, it's hard to help him. But if you help him blindly, he may make more efforts to carry out improper operation. The serious point is to connive him to make mistakes, and he may not know how to repent. So it's hard to decide whether to help or not.

6. Shit, you read this novel. It's a shame not to dig it. The author studied bitcoin for the sake of writing a novel, and then g it up. I made more than 60 million
your calculation method is basically correct, but there may be some deviation in understanding. This is to join the mine pool, and it is absolutely stable. If you dig alone, you'll get 25 at a time, or you'll never get them. Of course, it's more likely that you'll never find it. If you join the mine pool, although the mine pool is large, it is still difficult to get rid of the element of luck, so it will not be particularly stable. Moreover, different distribution methods will lead to different results. In addition, there are some handling charges for the mine. If all the computing power in the world is in the same mine pool, and the mine pool does not have a service charge. The computing power has been stable. So that's what you think.

7. There is no shortcut, only practice makes perfect.

8. It is recommended to call the police
alarm with relevant information and evidence.

9. 1、 Stimulating students' interest in learning
interest is the internal driving force and the basis of learning. From the heart, computing is really boring. We should cultivate students' interest in computing, arouse their enthusiasm in learning, and stimulate students' thirst for knowledge. As a teacher, we should try our best to attract students. As the calculation problem is composed of numbers and calculation symbols, it is more abstract and has no vivid plot. I think the forms of exercises should be diversified, such as multiple-choice questions, judgment questions, etc; In the way of practice, we should try our best to make it diversified, such as relay race, rush to answer and so on< Second, to strengthen the training of oral arithmetic, we should pay attention to the basic training of oral arithmetic, insist on regular practice, and graally become proficient, because any problem is composed of several oral arithmetic problems, which is the basis of written arithmetic, and the ability of oral arithmetic directly affects the accuracy and speed of written arithmetic. The students with strong ability of oral calculation have high accuracy and speed of written calculation; Students with poor oral calculation ability tend to have slow written calculation speed and high error rate. If the ability of oral calculation is strengthened, the speed of calculation will be improved. As an aspect of computational ability, oral calculation ability can not be ignored. So I think paying attention to oral arithmetic is an important part of improving the ability of calculation< Third, cultivate a strong will
the cultivation of students' strong will will has a good promoting effect on students' ability to carry out accurate and fast calculation for a long time. Practice every day. In the teaching of calculation, oral arithmetic is the basis of written arithmetic. According to the daily teaching content, some oral arithmetic training can be carried out timely and appropriately. In our class, 20 questions of oral arithmetic training every day has become the habit of students. Through the long-term persistent training, not only the students' strong will is cultivated, but also their computing ability is improved
in view of the weakness that primary school students only like to do simple calculation problems, but do not like to do or do not do slightly complex calculation, simple calculation and other problems, we should be good at finding primary school students' thinking obstacles in teaching, and overcome the psychological factors that affect students' correct calculation. It can be practiced in various ways, such as "interesting problem solving", "clever calculation competition", encouraging students to solve more than one problem and so on< Fourth, develop students' good habit of calculation.
some students have low calculation ability, for example, they have unclear concepts, do not really understand the calculation theory and master the algorithm skillfully. But it is also one of the important reasons that we have not formed a good habit of calculation; Some students have a bad habit of examining questions, and they often do it after half reading; Some students' writing is not standardized, numbers and operational symbols are scribbled, and numbers and symbols are copied wrong; Some people don't have the habit of checking the calculation, so they just finish the calculation. Therefore, some of the questions of the same nature in the same exercise may be right or wrong. Therefore, in order to improve students' computing ability, we should also pay attention to the cultivation of students' computing habits
1. Develop a good habit of examining questions
in teaching, I put forward strict requirements for students, asking them to calculate carefully. In addition, I also give students some methods. For example: Calculation of the inspection method, I summed up the following: a pair of questions, two pairs of vertical, three pairs of calculation, four pairs of number. The way to examine the topic is to see and think twice. That is: first look at the whole formula, which is composed of several parts, and think about how to calculate according to the general rules; Let's see if there are any special conditions. Let's see if we can use a simple method to calculate. If students do it according to these methods, the calculation will have a preliminary guarantee
for example, teaching two digits divided by one digit 52 ÷ 2, we should pay attention to the connection between "the remaining one cylinder and two badmintons are combined and divided again" in the communication operation and "the remaining ten and two badmintons are combined and divided continuously" in the vertical calculation; Teaching double digit by double digit 28 × At 12:00, by comparing the similarities and differences between "multiplication and addition" and "vertical method", help students understand "how to write the second part proct? Why write like this is the key to the algorithm. This kind of comparison not only promotes the students' deep understanding of the algorithm, but also helps them grasp the algorithm< 2. Develop good writing habits
Computational teaching is of great value to cultivate students' good learning attitude. Mathematics teaching should cultivate students' study habits, such as serious and careful homework, neat writing, format conforming to the regulations, and conscious checking of calculation results
demonstration. In teaching, the teacher's board performance, including the writing of numbers, the use of a ruler to draw horizontal lines, etc., and correcting the handwriting and symbols of homework, should be standardized and neat, so as to play a subtle demonstration role for students
summary. We pay attention to teach students to check the calculation method: a pair of questions, two pairs of vertical, three pairs of calculation, four pairs of results. The way to examine the topic is to "see and think twice". That is: first, look at the whole formula, which is composed of several parts, and think about how to calculate according to the general method; Let's see if there are any special conditions. Let's think about whether we can use a simple method to calculate. Don't do simple calculation blindly
reflection. In the teaching of calculation, students can be guided to reflect on the following questions: (1) how did the problem calculate in the first place? How to calculate now 2) What should be paid attention to in calculation 3) Is there any other calculation method
3. Develop a good habit of inspection
to cultivate students' good habit of calculation, do oral calculation as much as possible if they can, and use draft manuscript for vertical calculation consciously if they can't, and develop a good habit of inspection. In order to let students know the test method, we can generally use the relationship of four mixed operations to test. We can also flexibly use some test methods, such as the test of equation, we can use the substitution method< Practice is an important way for students to consolidate knowledge and form skills. The practice of calculation needs to combine the old with the new, speak carefully, practice skillfully and persevere
practice eating less and eating more. The improvement of students' computing level can not be achieved overnight, so it is necessary to strengthen the usual training. In order to improve students' calculation ability, we can arrange "practice every day", that is, practice 3-5 calculation questions every day, so that students can "review the old and learn the new"
exercises should be in various forms. In order to make students feel fresh all the time, the forms of calculation exercises should be diversified, such as games, competitions, rush answers, train driving, listening and calculation, limited time oral calculation, self compiled calculation problems, playing cards, table to table or group competition to adjust students' appetite. We can also tap the potential of students through the forms of "interesting problem solving" and "clever calculation competition"
practice should inspire thinking. The design of exercises should pay attention to the development of students' thinking. For example, after learning how to multiply two digits by two digits, show the exercises:
15 × 15= 25 × 25= 35 × 35 =
first, ask the students to use their mathematical knowledge for calculation, and then think: what are the characteristics of the two factors? What are the characteristics of ten digit and one digit proct? What is the relationship between the high digit of the proct and the ten digit of the factor? In this way, students find the law, understand the characteristics of the data, quickly master the fast calculation method, and then let students write the number directly:
55 × 55= 65 × 65= 75 × 75= 85 × 85=< Six, improve the evaluation
1, enhance the evaluation mechanism, cultivate students' interest. Develop an evaluation system, and reference and implement it throughout the semester. Such as: (1) in the classroom practice, the correct rate is 100%, oral praise. 2. The correct rate of class work is 100%, red flag award, and two points of seven color evaluation can be added. 3. Organize and carry out small class oral arithmetic competition, and give oral praise and appropriate material rewards to those who perform well.)
2.