As all United States issued paper currency contains Roman numerals, and such currency is traded worldwide, it is safe to say that nearly all countries use Roman numerals. However, there are no countries or cultures alive today which use Roman numerals for counting or math on a day-to-day basis.
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Roman numerals originated in ancient Rome in the country of Italy.
P is not used in Roman numerals.
Roman numerals were used for writing numbers in ancient rome.
CCCLX is the number 280 in roman numerals. This number is used to represent what roman used to write.
Yes, roman numerals were used in medieval times.