The Etruscans did and they once ruled the Romans.
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The ancient Egyptians used the decimal number system.
The Twelve Tablets of awesomeness
Roman numerals is one of them
roman numberales
they invented roman numerals because the roman guards were playing a game outside of the great Greece castle to do with lines and letters. they didn't no what they were doing but it turned into a system and now is known all around the world.