Whole brain fast calculation is a course of fast brain calculation technology developed by simulating computer operation program, which can let children quickly learn to add, subtract, multiply, divide, multiply and look up any number. So as to quickly improve the operation speed and accuracy of children.
The operating principle of quick calculation of the whole brain: Stimulate the brain through the activities of both hands, so that the brain directly produces sensitive conditioned reflex to numbers, thus achieving the purpose of quick calculation.
(1) With the hand as the operator, an intuitive operation process is generated.
(2) As a memory, the brain can react quickly and express the operation process. For example: 6752+ 1629 =? Operation process and method: the first digit 6+ 1 is 7, the last digit (7+6) exceeds 10, carry 1, the first digit 7+ 1 write 8, and the hundredth digit 7 minus 6' s complement 4 writes 3, (the last digit is 5+2.
Some principles of whole brain multiplication;
Assuming that A, B, C and D are undetermined numbers, the product of any two factors can be expressed as: AB× CD = (AB+A× D/C )× C0+B× D = AB× C0+A× D× C0/C+B× D = AB× C0+A× D ×/kloc. As long as the front derivatives of the two factors are integer multiples, the product of the two factors can be calculated in this way, that is, when A =nC, AB×CD=(AB+n D)×C0+B×D, for example, 23×13 = 29×/kloc-0+3× 3 = 299.
Fast addition calculation
The method of calculating the quick addition of arbitrary numbers is very simple. As long as learners remember a general formula of fast addition-"standard addition (decimal number) minus complement, and the previous digit plus 1", they can completely solve the problem of fast addition of any digit from high to low.
For example:
( 1),67+48=(6+5)× 10+(7-2)= 1 15,
(2) 758+496 = (7+5) × 100+(5-0) × 10+8-4 = 1254.
Subtraction and fast calculation
The fast subtraction for calculating any number of digits is also a general formula for fast subtraction-"standard subtraction (for borrowed digits), addition and subtraction, and the previous digit is reduced by 1 or more", which can completely solve the problem of fast subtraction for any number of digits from high to low.
For example:
( 1),67-48=(6-5)× 10+(7+2)= 19
(2), 758-496 = (7-5) × 100+(5+ 1) × 10+8-6 = 262.
Multiplication fast calculation
General formula of fast multiplication:
Ab× CD = (a+1)× c×100+b× d+Webster's fast calculation number×10. Fast calculation number |=(a-c)×d+(b+d- 10)×c, and fast calculation number ‖=(a+b- 10)×c+(d-c)×a, and fast calculation number ⅲ = a.
(1), the evolution number calculated by the first method =(a-c)×d+(b+d- 10)×c, which is suitable for any two-digit multiplication with the same beginning and end. For example: 26×28, 47×48, 87×84- and so on. The number of transitions is clear at a glance, which is equal to "8", "20" and "8" respectively.
(2) Using the second fast calculation method, the number of transitions =(a+b- 10)×c+(d-c)×a is suitable for the fast calculation of any two-digit multiplication in which the sum of two digits of one factor is close to "10" and the difference of two digits of another factor is close to "0", for example, 28×
(3) Using the third method to calculate the evolution number = a× d-'b' (complement )× c is suitable for the multiplication of any two-digit number.