Convert the Roman numeral CDXVI to Arabic numerals.

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Multiple Choice

Convert the Roman numeral CDXVI to Arabic numerals.

The essential idea is reading Roman numerals with subtractive and additive parts. In CDXVI, the pair CD uses subtractive notation: C before D means 500 minus 100, giving 400. After that, the X adds 10, and the VI adds 6. So the total is 400 + 10 + 6 = 416. If the X were not there, you’d have 400 plus 6, and if there were two X’s (XX) after the 400, you’d add 20 more, which would change the total.

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