They are easier to use then the Roman numerals. And the Roman number system did not contain a zero. This made it difficult for them to develop many mathematical concepts.
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Tradition, and also because Roman numerals are more recognisable than ancient Greek numerals.
One rule of Roman numerals is you cannot have more than 3 of the same letter in a row.
In todays modern notation of Roman numerals it is MCMXCV but the ancient Romans would have wrote the equivalent of 1995 quite differently than we do today
In todays modern notation of Roman numerals 1948 = MCMXLVIII But the ancient Romans would have wrote it out differently than how we do it today
Roman numerals were made just for the same reason as Arabic numerals we are using now.Romans needed some characters to record quantities, dates, taxes etc.So they invented their own system. Bear in mind that roman numerals are older than Arabic ones.