Swallowing gold in the sleeve is a mathematical operation method without abacus, which was originally invented by businessmen. They do business everywhere, thinking slowly and calculating slowly. This method is simple, fast and quiet, which is very suitable for trading. The algorithm of swallowing gold in the sleeve is a secret stunt of Shaanxi Bank, and some big merchants and shopkeepers in xi 'an know this algorithm. Later, swallowing gold into the sleeve became a secret skill of businessmen, which was easy to keep secret. Teacher Niu Hongwei's grandfather in Xi 'an can swallow gold in his sleeve. When he was a child, his grandfather taught Niu Hongwei to swallow gold in his sleeve. "The palm calculation of swallowing gold in the sleeve is inseparable from the abacus: you need to think of the left palm as a 5-speed abacus. The method of swallowing gold in the sleeve is to use five fingers of the left hand as a digital dial, each finger represents a number, and five fingers can represent five numbers: one, ten, hundred, thousand and ten thousand. The upper, middle and lower segments of each finger represent 1-9 numbers respectively. Arrange three numbers on each section, and the arrangement rules are divided into three columns: left, middle and right. Fingers are arranged on the left (from bottom to top) 1, 2, 3; Fingers are arranged in the middle (from top to bottom) 4, 5, 6; And the fingers are arranged on the right (from top to bottom) 7, 8 and 9. The calculation method of swallowing gold in the sleeve is a method of using mental arithmetic to reproduce the calculation process with the image of the brain and get the result. It regards the left hand as a virtual abacus with five gears, and clicks the virtual abacus with the right hand to calculate. When counting, point the fingers of your left hand with the fingers of your right hand. Its clear division of labor is: right thumb/left thumb, right index finger, left middle finger, right ring finger, left ring finger and right little finger. The corresponding professional division of labor does not interfere with each other. Which finger is clicked, which finger is extended, and which finger is not clicked, bending, indicating 0. Combined with the abacus formula, four operations of addition, subtraction, multiplication and division of any number within100000 digits can be performed. Like the martial arts school, there are also schools of pocket gold, which are roughly divided into two schools, one is one-handed and the other is two-handed. A few years ago, I attended a seminar. A participant once performed "Swallowing Gold in the Sleeve" live, using his left hand as an abacus, and the staff reported the figures. While listening, count quickly with your right hand on your left hand, and the calculation time is shorter than that with an abacus. Nowadays, businessmen don't have to swallow gold into their sleeves to settle accounts. However, some educators have applied this method to the field of early childhood education. Teacher Niu Hongwei of Xi 'an has been engaged in education for many years, which has improved the swallowing of gold in his sleeve. Make learning easier, more convenient and faster. He has taught thousands of children to learn the improved "swallowing gold in the sleeve". It has a good effect in inspiring children's intelligence. Swallowing gold in the sleeve-developing the child's whole brain. Swallowing gold in the sleeve is not a special function, but a scientific teaching method. More magical than abacus mental arithmetic. It uses hands and brains to complete the fast calculation of addition, subtraction, multiplication and division with amazing speed and high precision. It effectively develops students' brains and stimulates their potential.