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The Roman numeral system was started by the Etruscans who once ruled the Romans.
The Indians started the Hindu numeral system. We call it the Hindu-Arabic system because it was the Arabs of North Africa who brought the system to Europe.
The imperial system was too difficult to calculate with. The metric system started in Fance and because it was all based on powers of 10 it made calculations much easier
The decimal system started in Ancient China during the Shang Dynasty.
Started in ancient Rome, this unique numbering system is widely used in many countries in the present time. Then in the the 9th Century America started to use roman numerals.