Add together the individual numerals (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5, I = 1) unless a smaller numeral precedes a larger one in which case subtract it from the larger ones:
cdxxxii = (-100 + 500) + 10 + 10 + 10 + 1 + 1 = 432
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The numerals that most Americans use are the Indian numerals or the Arabian 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.
It is: 205 = CCV in Roman numerals
Hindu Arabic numerals are the ones we use. 39 is already in Hindu-Arabic numerals.
1.08 million written in numerals is 108,000,000