MMMMDCXX

MMMMDCXX is a Roman numeral. To convert it to the Arabic numeral system, we can break it down into its constituent parts. The Roman numeral M represents 1000, D represents 500, C represents 100, and X represents 10. In Roman numerals, when a symbol of lesser value precedes a symbol of greater value, it indicates subtraction. However, in MMMMDCXX, all symbols are arranged in descending order of value or are repeated. Therefore, we simply add the values together. We have four M's, which is 1000 + 1000 + 1000 + 1000 = 4000. Then we have one D, which is 500. Next, we have one C, which is 100. Finally, we have two X's, which is 10 + 10 = 20. Adding all these values together gives us 4000 + 500 + 100 + 20 = 4620. Thus, MMMMDCXX is equivalent to the Arabic numeral 4620. This representation follows the additive principle of Roman numerals where symbols are combined to form a larger number.