How do you right 99999 in roman numerals?

Answer 1

Under today's rules 99,999 written in Roman numerals is: (XCIX)CMXCIX

Numerals in brackets indicate multiplication by a thousand.

Hence:

(XCIX) = 99*1000 = 99,000

CMXCIX = 999

But today's rules governing the Roman numeral system were introduced during the Middle Ages so it's quite possible that the Romans themselves would have calculated the number 99,999 on a abacus counting device as (LXXXXVIIII)DCCCCLXXXXVIIII and then simply wrote it down as I(C) meaning minus 1 plus 100,000 which equals 99,999.

Answer 2

To write 99999 in Roman numerals, you would use the symbol for 100,000 (C) to represent the digit 9 and then subtract 1 (I) from it to represent the digit 99. Therefore, 99999 in Roman numerals would be written as C(IM).