That is how they chose to set out their number system.
There are some places where four is IIII rather than IV. But that's not exactly proper. You shouldn't ever run into an occasion where you need 4 or more symbols in a row without being able to use a different symbol.
Roman numerals do not have any symbol occurring consecutively more than three (or sometimes four) times. A number such as 5000, 6000 or 8000 would be written as the symbol V, VI or VIII (the Roman numerals for 5, 6 and 8 respectively) with a horizontal line over the top. The horizontal line indicates the number is multiplied by ten thousand.The remainder of the number would be written as it is normally written.
Roman numerals do not have any symbol occurring consecutively more than three (or sometimes four) times. A number such as 11000 would be written as the symbol XI (the Roman numeral for 11) with a horizontal line over the top. The horizontal line indicates the number is multiplied by ten thousand.The remainder of the number would be written as 393 is normally written: CCCXCIII.
Roman numerals do not have any symbol occurring consecutively more than three (or sometimes four) times. A number such as 7000 would be written as the symbol VII (the Roman numeral for 7) with a horizontal line over the top. The horizontal line indicates the number is multiplied by ten thousand.The remainder of the number would be written as 798 is normally written: DCCXCVIII
Roman numerals do not have any symbol occurring consecutively more than three (or sometimes four) times. A number such as 42 000 would be written as the symbol XLII (the Roman numeral for 42) with a horizontal line over the top. The horizontal line indicates the number is multiplied by ten thousand.The remainder of the number would be written as 394 is normally written: CCCXCIV
Roman numerals do not have any symbol occurring consecutively more than three (or sometimes four) times. A number such as 12000 would be written as the symbol XII (the Roman numeral for 12) with a horizontal line over the top. The horizontal line indicates the number is multiplied by ten thousand.The remainder of the number would be written as 89 is normally written: LXXXIV
We still do use Roman numerals to a limited extent but nowadays Hindu-Arabic numerals are used almost world wide because they contain a zero symbol thus making mathematical operations a lot easier whereas Roman numerals have no zero symbol as such which makes mathematical operations a lot more difficult.
We still use Roman numerals to a certain extent today but the Roman numeral system was replaced by the Hindu-Arabic numeral system because it contained a zero symbol thus making arithmetical operations a lot easier whereas the Roman numeral system has no zero symbol and mathematical operations were much more difficult.
Roman numerals do not have any symbol occurring consecutively more than three (or sometimes four) times. A number such as 45 000 would be written as the symbol XLV (the Roman numeral for 45) with a horizontal line over the top. The horizontal line indicates the number is multiplied by ten thousand.The remainder of the number would be written as 670 is normally written: DCLXX
Roman numerals do not have any symbol occurring consecutively more than three (or sometimes four) times. A number such as 160 000 would be written as the symbol CLX (the Roman numeral for 160) with a horizontal line over the top. The horizontal line indicates the number is multiplied by ten thousand.
Because Hindu-Arabic numerals contains a zero symbol which makes arithmetic a lot easier to calculate whereas Roman numerals have no zero symbol thus making arithmetic more difficult to calculate.
Roman numerals do not have any symbol occurring consecutively more than three (or sometimes four) times. A number such as 903 000 would be written as the symbol CMIII (the Roman numeral for 903) with a horizontal line over the top. The horizontal line indicates the number is multiplied by ten thousand.The remainder of the number would be written as 846 is normally written: DCCCXLVI