XISS is the same as XII and its value is 12
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It is 12 because the Roman numerals of XISS = 10+1+0.5+0.5 = 12
Expressed in Arabic numerals, the Roman numeral MCLXVI corresponds to 1166.
12629 is already expressed in Hindu-Arabic numerals
They are already expressed as Hindu-Arabic numerals.
The Arabic numbers for 1859 are 1859, the Roman numerals for 1859 are MDCCCLIX.