Question 2: What is abacus mental arithmetic? How to learn? Hello, the landlord, abacus mental arithmetic refers to: fast mental arithmetic to calculate addition, subtraction, multiplication and division, or even continuous calculation, a few operations will do.
As for how to calculate, first, we must master the method of dialing beads in mental arithmetic. Whether the method of dialing beads is correct or not will directly affect the operation speed and correct rate of mental calculation of beads. Basic skills, that is, picking pearls, listening, watching, beading and memorizing.
Second, we should master the basic arithmetic of abacus mental arithmetic, that is, the basic arithmetic of addition, such as: 2+ 1, 2+5, 2+6, 3+4, 4+8, 7+5, 8+4, 6+8; The basic subtraction algorithms are: 3- 1, 7-5, 8-6, 7-4, 12-8, 12-5, 12-4, 14-8.
Third, we should do proper exercise. To learn abacus mental arithmetic, besides mastering basic skills such as dialing beads, listening to numbers, watching numbers, drawing pictures and memorizing, and mastering basic arithmetic algorithms, you need to strengthen your practice. However, we should also pay attention to the scientific nature and the amount of practice.
Landlord, please accept it. Typing is very tiring!
Question 3: What is abacus mental arithmetic? How to calculate? Hello, the following function reference, I wish you happiness. Through the rules of abacus calculation, the method of calculating by using beads in mind is abacus mental calculation, which is referred to as "abacus mental calculation".
Abacus mental arithmetic is carried out in two steps, one is to learn abacus, and the other is to form "abacus" in the brain, that is, to establish a bead image. Through these two steps, you can form a quick and accurate mental arithmetic ability.
The key period of establishing brain image is 4~ 12 years old, which is the advantage for children to learn abacus mental arithmetic. According to the characteristics of children's growth and development, cartoon abacus mental arithmetic is based on the principle of "interesting first, then effective", which visualizes abstract concepts by cartoon means, visualizes and concretes monotonous calculation, makes children happy to participate, and invisibly achieves deep memory and habit of using, which embodies "playing".
Abacus mental arithmetic is the abbreviation of abacus mental arithmetic, which can also be said to be an abacus in the mind.
Mr. C. Harahara said: "The result obtained by intuition without relying on anything is called conceptual mental arithmetic." We can call the calculation in written form, rather than the calculation written on paper, mental calculation in written form. On the other hand, mental arithmetic based on abacus is called abacus mental arithmetic.
Abacus mental arithmetic is based on the number of 1 to 9, and is calculated according to the image of abacus mental arithmetic. Therefore, when digital images also appear in the brain, the images grasped by vision or touch are simple and clear, and the numbers are recognized as concrete objects (abacus calculation), which is more suitable for children to master mental arithmetic. Moreover, because the practice of abacus has become a preparatory practice of mental arithmetic, it will not take long for the practice of abacus mental arithmetic to be successful.
1. What is Xu Sizhong's heart?
In layman's terms, it is to use abacus in your head. The remarkable feature of Xu Sizhong's mental arithmetic is that children can get rid of abacus and enter the mental arithmetic state after learning a lesson, and everyone can learn it.
2. How old is the best child to learn Xu Sizhong's mental arithmetic?
Children above the middle class. From the physiological and psychological point of view, children in this age group mainly think in images. Abacus mental arithmetic is a fast mental arithmetic method that uses the spatial imagination and image reproduction ability of the brain to transform abacus and its pearl picking process from physical and physical movements into thinking and pearl picking operation in the brain. After puberty, we will lose the best time to develop our children's potential.
3. What are the benefits of children learning Xu Sizhong's mental arithmetic?
It can improve children's computing ability, develop children's thinking ability, enhance children's memory ability, cultivate children's innovation ability, develop children's imagination ability and enlighten children's observation ability.
Abacus mental arithmetic education conforms to the scientific principles of modern pedagogy, psychology and physiology: first, abacus mental arithmetic, as a rational and intuitive object, plays a bridge role in the formation of children's mental arithmetic skills, such as the transformation of information coding form, the understanding of carry concept and the improvement of calculation ability; Secondly, as the psychological mechanism formed by intellectual skills in stages, the meanings of words and symbols are constantly strengthened through images, and the images themselves are also constantly strengthened; Third, the abacus mental arithmetic process is an information processing mode flow, which needs to use vision, hearing and kinesthetic, which is conducive to the coordinated activities of the left and right hemispheres of the brain.
4. Will children learn Xu Sizhong's mental arithmetic affect primary school mathematics learning?
No, Xu Sizhong's Mental Arithmetic is arranged and written according to the principles of primary school mathematics teaching, and its style and language are basically the same as those of primary school mathematics now. Children's study of Xu Sizhong's mental arithmetic will not only affect their study of primary school mathematics, but also promote their study of primary school mathematics and other courses.
5. Do children have to use their mouths to learn Xu Sizhong's mental arithmetic?
You don't need any formula. Xu Sizhong's abacus mental arithmetic abandons the original complex formula method in abacus mental arithmetic teaching, and teaches children to learn abacus mental arithmetic according to mathematical principles and internal laws of abacus mental arithmetic.
6. Do children need to be accompanied by their parents when learning Xu Sizhong's mental arithmetic?
No need. Xu Sizhong's mental arithmetic textbook is concise, catchy and readable. Children can read and learn by themselves, and they don't need their parents to accompany them when teaching.
7. Does it take a lot of practice to learn Xu Sizhong's mental arithmetic?
There is no need to do a lot of exercises. Xu Sizhong does mental arithmetic, not crowd tactics. The design of exercise questions is based on children's cognitive rules and learning rules, from shallow to deep, step by step.
8. What kind of calculation level can children achieve after learning Xu Sizhong's mental arithmetic (six volumes)?
Every child can easily learn the contents of Xu Sizhong's Mental Arithmetic (six volumes), and his mental arithmetic ability can reach the level of calculation when he graduated from primary school, paving the way for primary school mathematics learning. ...& gt& gt
Question 4: What does mental arithmetic mean? 1. concept
Abacus mental arithmetic is also called abacus mental arithmetic or abacus quick calculation. Abacus mental arithmetic is a method of turning numbers into abacus beads in your mind for calculation. It is developed on the basis of abacus calculation. At present, it is very popular in Southeast Asia, and Taiwan Province Province, Singapore, Malaysia, South Korea and other places have mushroomed to set off a wave of mental arithmetic. In recent years, abacus mental arithmetic will set off a new research upsurge in Chinese mainland.
The mental arithmetic ability of abacus comes from brain images, and children themselves can actually feel the improvement of mental arithmetic ability. Therefore, abacus and mental arithmetic have stimulated children's thirst for knowledge from one digit to multiple digits. Through abacus mental arithmetic training, children can not only learn a special and beneficial calculation method, but also cultivate good study habits, inspire brain intelligence, strengthen thinking ability in images, communicate left and right brains, and make the development of the whole brain tend to be balanced and coordinated, thus being more creative.
Beginners learn abacus consciously, and then they can do it unconsciously and automatically. Anyone can do it. Then according to the image of the abacus, draw it in your mind and start practicing mental arithmetic. Through years of practice, it has been proved that learning abacus mental arithmetic at the age of 4-5 is the best. The general limit is about 10 years old, and once the brain image disappears, it cannot be regenerated.
Preschool children not only don't understand the concept of number, but also have no impression of number. In order to let children understand the concept of number, it is necessary to use special tools such as abacus as teaching AIDS. If you teach them abacus, it is easy to produce abacus images, but as they get older, they will produce their own digital images. Teaching them abacus mental arithmetic at this time is easy to cause confusion, so it is ideal to learn abacus mental arithmetic from an early age.
2. Origin
The mind is an activity of calculating numbers through thinking. It is a calculation in the brain by using the abacus representation as the carrier and the abacus rules. Since humans began to have the concepts of numbers and numbers, and can calculate the simplest numbers, there has been mental arithmetic. In order to assist mental arithmetic, the calculation tool of "taking things near and taking things far" appeared, and stones, branches and so on are also the most primitive calculation tools for taking things far.
Then, the calculation tools and corresponding algorithms such as calculation, abacus calculation, pen calculation and computer calculation were invented. The calculation speed and accuracy of modern electronic computers are unprecedented and unparalleled. However, no matter how to use any kind of calculation, it needs the participation of the human brain. In other words, the calculator was invented to assist mental arithmetic and improve the level of mental arithmetic. However, calculators can never replace the human brain and mental arithmetic. Social development needs more and more high-quality and intelligent talents.
If abacus mental arithmetic is used to develop and strengthen children's intelligence, more talents can be cultivated according to children's personality. If children can make good use of their natural intelligence, the psychological training function of mental arithmetic will shine brilliantly.
3. Brain images
Abacus mental arithmetic is to draw an abacus in your mind and form a brain image. Developing brain images is one of the ways to develop human wisdom, and it is a new thing. Brain mapping is a discipline, which refers to the perception of the past, although the scene at that time can be clearly recalled many years later. This knowledge of children is innate. After adolescence (usually after 10), this brain image will disappear from most children. Brain image talent constantly flows in the depths of the soul and becomes the driving force of learning and art. In this sense, the original intention of education can be understood as "bringing out the original things".
4. Features
Abacus mental arithmetic is to use abacus as a calculation tool and use the effect of brain image to calculate. Operating specific tools is most suitable for the concept of cultural number. The mind depicts the image of an abacus in the brain. The reason why it manipulates images is due to the role of brain images and unconsciousness. The process of gaze-concentration-unconscious memory is the same, and its characteristics are as follows:
(1) Easy to use
Abacus mental arithmetic has been sublimated from learning to use abacus to brain image, which is not limited by time and space.
(2) Fast speed
It is recognized that abacus mental arithmetic is faster than abacus and calculator, which can be confirmed by experiments and practice. Brain frequency > bead frequency > mouth frequency > key frequency > pen. At present, the brain frequency of abacus mental arithmetic players has reached 10- 1 1 times/second (ordinary people are 1.2- 1.5 times/second). Today, people need this kind of high-speed response.
(3) It has the function of enlightenment and education.
Abacus mental arithmetic transforms abstract thinking into image thinking, and alternately uses image thinking and abstract thinking for calculation, which is the development of > >.
Question 5: How is the heart calculated? What is the multiplication and square of 10-20?
Method:
1: mantissa complement 2: mantissa of multiplicand plus multiplier [all decimal] 3.
For example: 12* 13= 156
1: First add the mantissas together, and 2*3=6.
2: The mantissa of the multiplicand plus the multiplier is 12+3= 15.
3: Connection result = 156
[Same as square algorithm]
Two-digit method, the first number is the same, and the sum of the mantissas is 10.
Methods: 1: mantissa complementary 2: ten digits plus one 3: end-to-end multiplication.
For example: 54*56=3024
1: The mantissa is 4*6=24, written directly as tens and digits.
2: Ten digits plus one 5+ 1=6
3: First and last multiplication 6*5=30
4: Connection result =3024
The mantissa is the square of 5.
Methods: mantissa multiplied by 2: ten digits plus one 3: the first digit multiplied by.
For example: the square of 25
1: the mantissa is multiplied by 5*5=25, which is directly written as ten digits and one digit.
2: Ten digits plus a 2+ 1=3, and then two digits multiplied by 3*2=6.
3: Connection result =625
Square of a number close to 100 [just close to 1000]
Method: subtract this number with 100, write the square of the difference on the unit and the tenth place, and subtract the difference with this number.
Example: 94
1: 100-94=6
2: 6 squared =36
3: Subtract the difference =88 from this number and write it into hundreds and thousands.
4: Connection result =8836
The square of any two books
Methods: 1: mantissa squared 2: mantissa multiplied by two 3: mantissa squared.
For example: the square of 23
1: the square of mantissa squared 3 =9.
2: mantissa multiplied by two 2*3=6 6*2= 12, and written on the decimal place [full decimal place].
3: The square of the square of the first number is 4, plus 1 of the ten digits, which is 5.
4: Connection result =529
Question 6: How to do mental arithmetic? Shanghai abacus mental arithmetic Shanghai orthodox mental arithmetic: 9+9.
The right index finger and thumb dial 9 on the abacus.
+9 (use the formula +9=- 1+ 10): the right index finger is negative 1 and the left thumb is positive 10. The answer is 18.
For example: 6+9