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They didn't because this numeracy system was conceived by the Etruscans who once ruled the Romans

First of all, let me note that the theory that Rome was ruled by the Etruscans has now been challenged. Its evidence base was flimsy and its key tenets were based on unproven assumptions. More recent archaeological evidence suggests a different picture.

The Roman numerals were devised by the Romans (or probably the Latins more in general), not the Etruscans. The Roman numerals were not derived from Etruscan numerals. Two systems were partially related, probably due to the fact that both of them were inspired by the Attic numerals of the Greeks. However, they two used different symbols. Etruscan numerals are still not fully understood just as the Etruscan language has not been fully deciphered due to the small number of recovered inscriptions.

The Roman system, like that of many ancient peoples, originated from a tally system. The counting of entities was recorded by etching tally marks on wood. That is why 1 is I, 2 in II and 3 is III. The tallies were added to each other. Every five notches there was a different symbol, like ᶺ for 5. This symbol was later inverted and became V. Later in time, all these special symbols were converted into letters of the Latin alphabet: X (10), L (50), C (100), D (50), M (1,000). Thus, 15 was XV, 20 was XX, 25 was XXV, 30 was XXX, 60 Was LX, 110 was CX, 150 was CL, 170 was CLXX, etc.

The system was originally complicated. For example 8 was IIIIVIII. It was then simplified with an abbreviation; 8 became VIII. 23 was originally IIIIVIIIIXIIIIVIIIIXIII. Later it was abbreviated as XXIII.

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Well, of course they did-clue's kind of in the title 'ROMAN NUMERALS'

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The questioner asked How not Whether they invested them

Q: How did the Romans invent the Roman numerals?

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The Romans used Roman numerals because that was their way of calculating. Roman numerals are really very simple and straightforward. For example, the I = 1, no problem there. Three I's - 3. C = 100, the Latin abbreviation for centum , M - 1000, the Latin abbreviation for mille. For us it takes a bit of figuring out, but for the Romans it was simple; if a person could count, he could read numbers.

Roman numerals were created by the Etruscans who once ruled the Romans.

Roman numerals were conceived by the Etruscans who once ruled the Romans.

Queen Elizabeth II, who is the current monarch of Great Britain did not invent Roman numerals. They have been in use for over two thousand years, most notably by the Romans.

Strange as it may seem but Roman numerals had nothing to do with the Romans because this form of numeracy was first concieved by the Etruscans who once ruled the Romans.

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they invent in on a cave...

The Romans did invent the lottery during the 1400s. They would paint roman numerals on clay balls that were then mixed up and drawn.

By research i believe the Etruscans created Roman numerals these two numbers systems have similarities except they have different symbolic signs towards each other. The Etruscans did and they once ruled the Romans.

They didn't it was the Etruscans who came up with the idea of of writing out symbols to represent numerical quantities and the Romans copied it. The Etruscans once ruled the Romans.

The Romans invented Roman Numerals.

No, they inherited them from the Etruscans.

In Roman numerals 1219 is MCCXIX.

The Romans used Roman numerals because that was their way of calculating. Roman numerals are really very simple and straightforward. For example, the I = 1, no problem there. Three I's - 3. C = 100, the Latin abbreviation for centum , M - 1000, the Latin abbreviation for mille. For us it takes a bit of figuring out, but for the Romans it was simple; if a person could count, he could read numbers.

Roman numerals were created by the Etruscans who once ruled the Romans.

They didn't because this type of numeracy system was created by the mysterious Etruscans and not much is known in history about them.

The Romans

The Romans.