In today's modern usage of Roman numerals it is 643 equals DCXLIII but the ancient Romans would have probably notated the equivalent of 643 as DCXXXXIII
DC= 600 XL = 40 III = 3 643 in Arabic numerals translates to DCXLIII in Roman Numerals. http://www.novaroma.org/via_romana/numbers.HTML
Roman numerals do not make provision for decimals. 22 is XXII
8D Nonono, Roman Numerals were a counting system. Just like you can't make letters with 123..., you can't make letters for numerals.
DLXXIV
1109
DCCCXXXII
MMXIII
VI
CCCXIX
II
476 = CDLXXVI in Roman numerals
We still use Roman numbers today. One place where you often see Roman numbers is on a clock face. We generally make use of less of Roman Numerals.3604262 in roman numerals is MMMDCMMMMCCLXII.