Don't!

First of all, 10 1000 is 1000. Just shoot.

The number Wan first appeared in the late Eastern Han Dynasty, but there was no such word in the early days. ...

At the same time, it must be pointed out that as a specific application in measurement, it is often not decimal or even mixed.

Such as weight (mass) units.

1 stone =4 jun; 1 jun =30 kg; 1 gold = 16 beam; 1 two =24 baht

Another example is the capacity unit.

, Dou, Sheng and He are all in 10, which is OK. As a result, smaller units began to fly by themselves. ...

1 =2, 1 =5, 1 =4 ...

Therefore, before the Han Dynasty, China's mathematical decimal system was probably not decimal, but mixed but not unified.

However, it is noted that the decimal abacus has been recorded in the numerology notes at the end of the Eastern Han Dynasty (but note that the abacus was invented by Sumerians, but the Sumerians' abacus was sexagesimal ...), so it should be considered that the abacus was introduced from the Silk Road, and by the end of the Eastern Han Dynasty, the people spontaneously began to popularize the decimal counting method.