Multiplication is interpreted as "the method of flying". In the mathematical development of various civilizations, it is a very critical step to generate multipliers. For a civilization, calculation, addition and subtraction can develop smoothly. But it is not easy to create a simple and practical multiplication.

The vertical multiplication operation we are using now seems simple, but in fact we need to be familiar with the formula of 99 multiplication in advance. We will learn how different civilizations invented multiplication in the process of mathematical development, and some can even give up the multiplication table completely. Multiplication is a basic mathematical operation. Suppose a times b= c, that is, ab= c or a.b = C.

Multiplication refers to how many times a number or quantity has been increased. For example, 4 times 5, that is, 4 increases 5 times, or it can be said that 5 4' s are added together. Multiplication calculation. 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.

Multiplication is a shortcut to add up the same numbers. The result of its operation is called product, and "X" is the symbol of multiplication. From the philosophical point of view, multiplication is the result of qualitative change caused by additive quantity. The multiplication of integers (including negative numbers), rational numbers (fractions) and real numbers is a systematic summary of this basic definition.

Calculation method

The common methods of using pencil and paper multiplier need a small number (usually any two numbers between 0 and 9) to store or query the product multiplication table, but a farmer multiplication algorithm does not need it.

Multiplying a number with multiple decimal places is troublesome and error-prone. The universal logarithm was invented to simplify this calculation. The slide rule allows numbers to be quickly multiplied by about three digits of precision. Since the early 20th century, mechanical calculators, such as Marchant, have automatically multiplied as many as 10 digits. Modern electronic computers and calculators greatly reduce the need for manual multiplication.