The Roman numeral system was used during ancient Roman times, but use of the system continued long after the Roman Empire declined. In the 14th century, Roman numerals were slowly replaced by Hindu-Arabic numbers.
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It is used by Romans, because they use Roman numerals. In Roman Numerals, x represents ten (10)
It was the Etruscans, who once ruled the Romans, that invented Roman numerals. The Romans then began to use the Etruscan numeral system with some modifications
Roman numerals were the symbols developed by the Ancient Romans for counting and other numbering activities. The Romans used them because they developed them and that was what they knew. What do you use numbers for? They used them for the exact same things, instead of the kind of numbers we use, which are known as Arabic numerals.
The Romans did not have the concept of zero-- there is no Roman numeral for zero. This lack made it virtually impossible to do arithmetic with Roman numerals and that is why we use Arabic numerals nowadays.
Romans used Roman numerals as their form of numbers. Romans needed Roman Numerals because they needed numbers to count, tell time, and do other things in life that involved numbers. Roman numerals were used because they could all be scribed using a flat chisel i.e X I V M.