But this does not mean that there is only one counting method, decimal counting. For example, all countries in the world use the decimal system when calculating the year, month and day (12 months is a year). For another example, in China, only 16 is considered as a catty, which is the "hexadecimal counting method"; Coincidentally, in the British weight unit, 1 constant pound is also equal to 16 ounce (also called "English ounce" or "pound"). Why is this happening? Because our ancestors often thought hexadecimal was convenient to divide things into two phases, I think the British probably thought so, too. Probably because it is more convenient to divide it into equal parts many times, people in the ancient two river basins first invented the method of calculating time and circumferential angle in hexadecimal, and later extended it to the whole world.

Interestingly, it is said that there is a village in Latin America where the same clan lives. Since the fingers and toes of residents are 12, the decimal method is used for daily counting.

In the past, conservative British people have always insisted on carrying out the carry system, which is very complicated for foreigners: 1 pound = 20 shillings; 1 shilling =12p. Dizzy! Foreigners in Britain often don't know how many pennies 1 pound can be exchanged, nor how many pennies 1 pound can be exchanged. It was not until 197 1 that the British government could not stop the world trend and announced that the currency was decimal: 1 pound =100p, and the shilling was cancelled.

There are other carry systems in the world, so I won't talk about those that are not commonly used.

In modern times, the "binary" in mathematics has become popular in electronic technology and made immortal contributions. This is a well-known fact, and I don't need to repeat it.