because they did not no numbers exist
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It is used by Romans, because they use Roman numerals. In Roman Numerals, x represents ten (10)
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.
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
the Romans did not knew the 1 2 3. so they used it for everything that involved numbers.
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.