CM = 900 seethe related link http://www.pubquizhelp.34sp.com/lang/roman.html CM
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900 because CM = -100+1000 = 900
In Roman numerals C = 100 and M = 1000. CM means 100 before 1000, which is 900.
800- DCCC 800 is known as DCCC in roman numerals because the rule of roman numerals goes over three digits which means DCCCC is not 900 in roman numerals 900 is CM.
909- CMIX 909 is CMIX in roman numerals because CM represents 900 in roman numerals and IX represents 9 in roman numerals; because 800 is DCCC in roman numerals, 900 will not be DCCCC because it breaks the rule so CM is 900. Anyways, according to 909 that is the correct answer.
900