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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 one.

A numeral included in parentheses (or written with a bar over it) is multiplied by 1000.

→ 42195 = ((-10 + 50) + 1 + 1) × 1000 + (100 + (-10 + 100) + 5) = (XLII)CXCV

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9y ago

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