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They are as follows:-

Method one

XV+XVI = XXXI (15)+(16) = (31)

XXXI+XVII = XLVIII (31)+(17) = (58-10)

XLVIII+IIXX = LXVI (58-10)+(20-2) = (66)

Method two

XV+XVI = XXXI (15)+(16) = (31)

XXXI+XVII = XXXXVIII (31)+(17) = (48)

XXXXVIII+XVIII = LXVI (48)+(18) = (66)

Note that for more complicated calculations the Romans would have made use of an abacus counting mechanism which today is equivalent to a calculator.

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Q: What are two ways of adding 15 16 17 and 18 both in Roman numerals?
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