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
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.
476 = CDLXXVI in Roman numerals