The concept of multiplication: one of the basic operation methods in mathematics. The simplest is the multiplication of positive integers, that is, a simple algorithm that adds several identical numbers and multiplies the addend by the number added continuously.

Significance of multiplication: its essence is a simple operation to find the sum of several identical addends, which is true in ancient and modern textbooks.

Ancient multiplication:

Multiplication is one of the basic operations in mathematics. Suppose a times b equals c, which means ab=c or ab = C.

In ancient China, multiplication was carried out by several chips. There are three layers in calculating multiplication: the upper layer is the multiplicand, the middle layer is the product and the lower layer is the multiplier. Multiply the multiplicand by the largest bit of the multiplier, remove the calculation of this bit after multiplication, multiply it by the second bit, and add the numbers on the corresponding bits of the two products until the multiplication is over.

For example, 8 1 × 8 1, first put the multiplier and the multiplicand in the high position and the low position respectively. Multiply 80 by 8 1 to get 6480. When it's used up, it drops. 8 1 times 1 to get 8 1, plus 6480, it is equal to 656 1. When it's used up, it drops.