Because at one time 500 was represented by I) meaning 1*500 and over time it became D
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500 = D
D = 500
"D" in Roman Numerals equals 500.
D in Roman numerals is equal to 500 at one time 500 was expressed as I) meaning 1*500 over time they were merged to today's D.
D is 500 in Roman Numerals.