The numerals that most Americans use are the Indian numerals or the Arabian numerals
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Hindu Arabic numerals are the ones we use. 39 is already in Hindu-Arabic numerals.
Greek numerals are a system of representing numbers using the letters of the Greek alphabet. They are also known as Milesian numerals, Alexandrian numerals, or alphabetic numerals. In modern Greece, they are still in use for ordinal numbers.
We do use Roman numerals today. For example, Roman numerals are often found in making outlines; to label book chapters; to label the frontmatter (pages) in books.
India
It is: 205 = CCV in Roman numerals