49.9 million in Scientific Notation = 4.99 x 107
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499/40
In scientific notation: 5.0*10^2 = 500 As a Roman numeral: D = 500
In accordance with today's rules it is CDXCIX But the Romans themselves in the past probably wrote it out simply as ID (-1+500=499)
In todays notation of Roman numerals they represent 499
500 000 - 1 = 499 999