How to calculate the finger speed from 7 to 4

The finger speed algorithm is 7 minus 4: Mr. Wang gives 7 fingers, then bends 4 fingers, and the remaining 7-4=3 fingers are vertical.

The finger speed algorithm-palm calculation-uses five fingers of the left hand as a digital dial, each finger represents a number, and the little finger, ring finger, middle finger, index finger and thumb can represent five numbers respectively.

Extended data:

Make a fist with both hands, palms inward, and the interval between the two fists should not be too wide. Raise your arms horizontally and extend your fingers from your right index finger, which means1; The middle finger extension represents 2; The extension of the ring finger represents 3; The little finger extends to represent 4; Four fingers retracted, thumb extended, representing 5; When counting to 9, retract the extended five fingers, and the extended left index finger represents10; 1 1? The index finger of the left hand does not move, and the index finger of the right hand extends again, and then goes down to19 in turn; Take back the five fingers of the right hand and the middle finger of the left hand is 20. When you count to 49, retract the fingers of your right hand and left hand. The thumb of your left hand represents 50, and so on to 99.

1. Finger positioning formula

I have a pair of hands, representing ninety-nine; I will set ten for my left hand and ninety for me.

Pose your right hand and count from one to nine; It's convenient to add and subtract, so don't worry about calculation.

2. Finger formula

The index finger extends "1" and the middle finger extends "2"; The ring finger is "3" and the little finger is "4"; Four fingers and a thumb, the thumb is "5" to remember; Then extend the index finger to the little finger, and "6", "7", "8" and "9" are arranged in numbers.

3. Practice this formula with your right finger.

Take the lead, two tigers contend, in a few words, the four seas are at home, and the grain is abundant.

Six animals are thriving, and the eight immortals are crossing the sea, and nine Niu Yi hairs are urgent.

A word nine, two dragons playing with pearls, three pillars separated, surrounded by enemies, the grain is abundant.

Six gods without a master, seven ups and downs, exquisite, nine Niu Yi hairs, perfect.

(Note: When reading "urgent" or "perfect", make a fist in your right hand and put "1" in your left hand, indicating carry. )

4. The left hand points out the exercise formula: ten, twenty, thirty, forty; Fifty, sixty, seventy, eighty, ninety, one hundred.

(Note: When reading "100", clap your hands, and then put your fist on your chest. )

Baidu Encyclopedia-Finger Speed Algorithm