The roman numerals can be only helpful when you learn about quadrants in the 7th grade. That's only one reason that roman numerals are helpful in math.
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I use roman numerals in math
They used Roman numerals and an abacus counting device
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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.