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"What are the rules in changing hindu-arabic into roman numerals"
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Hindu
XXLII is not a Roman numeral as it does not conforms to the rules of writing numerals. If it were a numeral you might suppose that it would represent... (20 less than 50) + 2 which is of course 32 but the correct Roman numeral for 32 is XXXII
The largest value Roman numeral that you can write, which conforms to the rules of writing Roman numerals, using just D, C and L symbols is DCCCL (850)
No, according to the rules of writing Roman numerals while it is allowable for a single X to preceed L or C two or more numerals should not preceed a numeral of higher value. The correct way to write 89 as a Roman numeral is LXXXIX