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ABCDEFGHIJKLMNOPQRSTUVWXYZAAABACADAEAFAGAHAIAJAKALAMANAOAPAQARASATAUAVAWAXAYAZBABBBCBDBEBFBGBHBIBJBKBLBMBNBOBPBQBRBSBTBUBVBWBXBYBZCACBCCCDCECFCGCHCICJCKCLCMCNCOCPCQCRCSCTCUCV
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Convert to or from Roman Numeral System
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Convert Roman Numerals to Decimal
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Romanmmmcmxcix
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Values10001000100010010001010011000
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Calculation10001000100009000900900
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Decimal3999
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I 1V 5X 10L 50C 100D 500M 1000
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Convert Decimal to Roman Numerals
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RomanLXXX
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Values501010100000000
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Calculation30201000000000
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Decimal80
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New Roman Numeral System displays numbers by removing a smaller number from a larger number that is to the Right. So MC is 1000+100, and CM is 1000-100.
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Additive Numeral Systems such as Roman Numeral are limited by the number of symbols they have, new symbols must be invented for higher values. So, how about P for 5000, and U for 10000. :)
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MCMXVII
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1000+[1000-100]+10+5+1+1
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1000
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900
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10
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5
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1
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1
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1917
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3999MMMCMXCIX
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