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No countries use them in their day-to-day activities. They are most usually encountered in the copyright dates on films and television programmes.
We learned the metric system in math today.
Learning early numeration systems gives you an historic insight into how numeracy has evolved and developed over many thousands of years ago to what it is today. Also it enables you to become more confident when dealing with other branches of mathematics such as algebra because these early numeration systems used symbols or letters (like Roman numerals) instead of the numbers we use today.
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.
Hindu Arabic Numerals use numbers but Roman numerals use symbols.