1, a cross: x, for example 2X3=6.

2. point a: such as A B = AXB.

3. The number of snowflakes: *, for example, 3*2=6.

4. Omit: for example, 3a.

Man has mastered multiplication for a long time. In China, the "99" multiplication table appeared more than 2000 years ago, and dot matrix multiplication also appeared in the west. 1540, the German mathematician Steffi used the Latin letter "m" to represent multiplicntio, which is the first letter of the Latin word "multiply".

Behind multiplication

In our country, these two symbols are used. Numbers are multiplied by "X", while numbers are multiplied by letters, or letters are multiplied by "X" or omitted. China's ancient mathematical work "The Art of War" said: "The method of division is different from multiplication." At that time, people used calculations and formulas to calculate division.

In addition, it should be noted that Arabs use the method of adding a short line "-"between two numbers to represent division. 163 1 year, the mathematician W. Oughtred also imagined using the symbol ":"to represent division, but it was not popularized.