it has a very different way of counting - by add or detract whether the number is in front or back.
it was invented before Christ
now people use it when they are in euro
it is not as popular as the Arabic number system
There are a bunch more.
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Some use roman numerals because some doesn't know numbers, so instead it is roman numerals.
to follow roman numerals is sereos in working
The numbers 1221 in Roman numerals is MCCXXI. Roman numerals is the numeric system that was used in ancient Rome and is still used on some clocks and watches.
Some countries only use Roman Numerals, so they use it a lot.
Spend a day using only roman numerals instead of Arabic numerals. The disadvantages will become painfully obvious.