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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 ones.

→ MCMXC = 1000 + (-100 + 1000) + (-10 + 100) = 1990.

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10y ago

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