A zero symbol was used in some ancient numeral systems for positional place value purposes whereas the Roman numeral system didn't need a zero symbol because the positional place value of the numerals are self evident as for example DV is equivalent to 505.
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XLII is 42 in Roman numerals. XXXIV is 34 in Roman numerals. The difference between them is 8, or VIII in Roman numerals.
Roman numerals were used for writing numbers in ancient rome.
Roman numerals originated in ancient Rome in the country of Italy.
The ancient Romans would have notated 1842 in Roman numerals as MDCCCXXXXII
Tradition, and also because Roman numerals are more recognisable than ancient Greek numerals.