Crossword clues for I, in Roman numerals:IAMSum for one using Roman numerals, perhaps?CCINew Jersey area code, in ancient Rome (oh, did you want to do Roman numeral math? That's what I thought)CCCThree hundos, in Roman numeralsTRERoman numeral?MCI1,101 in Roman numeralsCVI106, in Roman numeralsCMI901 in Roman numeralsMMIILast year that was a palindrome, in Roman numeralsLVIThis clue's number in Roman numeralsPIUSIFirst of 12 popes (just put the Roman numeral in now and get the name from the crossings)IIIISupposedly legit Roman numeral 4CCCVINumber of days of the year in 2020, if we ignore April and November and put that number into Roman numeralsCVII107, in Roman numeralsDCCV705, in Roman numeralsDCII602, in Roman numeralsCLV155, in Roman numeralsCDVI406, in Roman numeralsDIII503, in Roman numeralsONEI, in Roman numeralsLIII53, in Roman numeralsCALLMEMADAMMusical title all of whose consonants are Roman numeralsXVISweet Roman numeral?MCIPhone company name that looks like a Roman numeralMII1002, in Roman numeralsCCC3 hunna, if Chief Keef rapped in Roman numeralsCLIX159, in Roman numeralsLIVActress Tyler whose first name will, in 18 years, be her age in Roman numeralsMDCCL1750, in Roman numeralsXCIThe fourth- and sixth-smallest prime numbers multiplied, in Roman numeralsMMCLI2151, in Roman numeralsCMLI951, in Roman numeralsTRESmall Roman numeralMDCLargest number using three different Roman numeralsBASETENLike the Roman numeral systemSETTERoman numeralDIALRoman numerals may be seen on oneCNOTEMonetary nickname based on a Roman numeralLIVName that's also a Roman numeralSEIRoman numeral?DCV605, in Roman numeralsYEARIt's in Roman numerals in most filmsLXI61, in Roman numeralsMDCL1650, in Roman numeralsCCIX209, in Roman numeralsCCVI206, in Roman numeralsMVI1006, in Roman numeralsDXI511, in Roman numeralsMML2050, in Roman numeralsMMMI3,001, in Roman numerals158719Multiple of XI (except not in Roman numerals; also, hope you learned the trick for checking divisibility by eleven, which is similar to the trick for nine except with an alternating sum, because eleven is one more than ten while nine is one less than ten)