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The above numbers converted into Roman numerals are IX, XC, M, CM and XI respectively and the Romans would have probably added them up in the following fashion:-

IX+XC = IC

IC+M = IMC

IMC+CM = IMM

IMM+XI = MMX

Hindu-Arabic conversion:-

9+90 = 99

99+1000 = 1099

1099+900 = 1999

1999+11 = 2010

For more complicated calculations the Romans would have used an abacus counting device.

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Q: How would you convert the Hindu-Arabic numerals of 9 90 1000 900 and 11 into Roman numerals and then add them up?
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