In China, we started the arduous and long process of memorizing multiplication tables almost from kindergarten. I remember when I was a child, many people were criticized by teachers and trained by their parents in order to memorize multiplication formulas. But in the end, they are all familiar with the heart and are handy to use. But I have to say that the multiplication table of 1999 is really easy to use, which lays a certain foundation for every student in China to learn mathematics. Therefore, China's mathematics has always been awesome and has always dominated the world.

As we all know, there is no multiplication table abroad, so how do they calculate multiplication? In fact, foreigners also have their own algorithms, that is, drawing lines to calculate multiplication.

For example, 12× 1 1, first draw a vertical line, representing 10, and then draw two vertical lines, representing 2. "12" means:

Then draw two horizontal lines to indicate "1 1":

Then start to find the intersection of these lines:

Finally, counting from the lower right corner, the intersection point is from the lower right corner to the lower left corner. Units are one, ten, one hundred, one thousand and ten thousand.

Therefore,12×11=132.

Another example: 2 12X 16, first draw two lines, 1 and two vertical lines to represent "212"; Draw 1 and six horizontal lines to represent "16" respectively, and then find the intersection point.

Finally, there is a point 12 in the lower right corner, which exceeds 10. Enter a place and mark it next to it.

Remember to add 1 when counting next.

Netizens joked: Is this the legendary "linear algebra"?

I thought you were playing gobang. ...

In fact, this method is called "line multiplication". It looks awesome at first glance. Just a few points, no need to recite the multiplication formula!

However, once the multiplied number becomes larger, the workload will be great.

For example, this is 99×99:

Imagine 999×999 again, the picture is so beautiful ... The draft paper should be at least 10 meter, right?

Haha, you will be blind if you count a little like this. ...

It can be seen that once the number becomes larger, the amount of calculation is enough, and it is estimated that a few points will be tired!

Little friends, have you found the 99 multiplication table at this time? But, do any of us know how the 99 bid came about?

During the Spring and Autumn Period and the Warring States Period, not only the decimal system was invented, but also the nine-nine watch was invented. Later, the East was introduced to Korea and Japan, and then spread to India and Persia in the west through the Silk Road, which became popular all over the world. Some people even regard the long multiplication table as an artifact more important than the four great inventions of China. It can be seen how prominent its status is.

After the multiplication table of 201March 5 1999 was introduced into Britain, the formula became longer due to different languages, which made it very difficult to recite. Therefore, the British version of "one lesson and one practice" is likely to be changed to the multiplication table of 12× 12.

That's amazing. I have to worship our multiplication table. If we do ten calculation problems with foreigners at the same time, it is estimated that they will finish one when we finish. Knowing that foreigners use "lines" to calculate multiplication, I really admire the wisdom of China people!