What number do the Roman numerals MMCDXXXIX represent?

Answer 1

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.

→ MMCDXXXIX = 1000 + 1000 + (500 - 100) + 10 + 10 + 10 + (10 - 1) = 2439

Answer 2

M represents 1000, D is 500, X is 10 and C is 100. This would convert to 2439.