Ten times ten: formula: head joint, tail to tail, tail to tail. The heads are the same, and the tails are complementary (the sum of the tails is equal to 10): formula: after a head is added with 1, the head is multiplied by the head and the tail is multiplied by the tail. The first multiplier is complementary, and the other multiplier has the same number: formula: after a head is added with 1, the head is multiplied by the head and the tail is multiplied by the tail.

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.

The number on each finger is 9. First, we see that there are three knuckles on our fingers. From top to bottom, the left side of the first knuckle stands for 1, the left side of the second knuckle stands for 2, the left side of the third knuckle stands for 3, from 3 to the palm of your hand stands for 4, the upper end of your finger stands for 5, and the abdomen of your finger stands for 6. There are three horizontal bars on your finger. From top to bottom, the first bar represents 7 and the second bar represents 7.

Finger speed algorithm. The calculation method of palm calculation is a method to reproduce the calculation process by using brain images and mental arithmetic, and get the results. It regards the left hand as a five-gear abacus, and uses the right hand to count according to this abacus.

When counting, point the fingers of your left hand with the fingers of your right hand. Its clear division of labor is: right thumb points left thumb, right index finger points left index finger, right middle finger points left middle finger, right ring finger points left ring finger, and right little finger points left 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. It doesn't need any calculation tools, and it doesn't list arithmetic programs. It only needs to close two hands gently to know the answer number, and can perform four operations of addition, subtraction, multiplication and division of any number within 100 thousand.

Finger speed algorithm, palm calculation-reduce the complicated calculation process of pen calculation formula, save time and effort, and improve the calculation speed of students. Niu Hongwei, a teacher in Xi 'an, has been engaged in education for many years and applied the palm calculation method to the field of early childhood education. He has taught thousands of children to learn palmistry. It has a good effect in inspiring children's intelligence. Palm computing has effectively developed students' brains and stimulated their potential.