When a numeral has a cross bar above it, that numeral is multiplied by a thousand. M=1000, MM=2000. e.g. 3634 would be MMMDCXXXIV
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In Roman numerals, "xxxx" does not represent the number 40. The Roman numeral for 40 is "XL," which is equivalent to 50-10. Roman numerals are based on a subtractive principle, where a smaller numeral before a larger one subtracts its value from the larger numeral. So, in this case, "XL" represents 40 in Roman numerals.
LLXX equals CXX which is the equivalent of 120.
The Roman numeral IV represents the number 4 in our modern Arabic numeral system. In Roman numerals, "I" represents 1 and "V" represents 5. When a smaller numeral (I) is placed before a larger numeral (V), it is subtracted from the larger numeral, resulting in 4.
The Roman numeral XIX the same as 19 in Arabic numerals.
IXXIII is not a valid Roman numeral. In Roman numerals, I represents 1, X represents 10, and V represents 5. When a smaller numeral appears before a larger numeral, it is subtracted from the larger numeral. Therefore, the correct representation of 9 followed by 13 in Roman numerals would be IXXIII, which is 9 followed by 13 and not a standard Roman numeral.