They are: M=1000, D=500, C=100, L=50, X=10, V=5 and I=1
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because the Ancient Romans did not have symbols for numbers.
Hindu Arabic Numerals use numbers but Roman numerals use symbols.
The numer 1145 in roman numerals is MCXLVSo the answer is 5 symbols.
From the Etruscans but they changed the numbers. The Roman system came into use in the 4th Century, but the symbols that we learn weren't introduced until the 1st Century.
It is superior from other systems because it has separate symbols for all numbers to 10 unlike Mayan or roman numerals who for 6 have to use 2 symbols (a line under a dot for Mayan and a V then an I for roman)