7: M=1000, D=500, C=100, L=50, X=10, V=5 and I=1
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There are 7 different letters used in the Roman numeral system: 1 = I 5 = V 10 = X 50 = L 100 = C 500 = D 1000 = M All other numbers are made up of combinations of these letters.
there are many types. like roman ,egyptian ,mayan.
for me if you add how many hindu arabic you write it can be in number on roman numerals,
There are 7 main letters which are: M=1000, D=500, C=100, L=50, X=10, V=5 and I=1
They are easier to use then the Roman numerals. And the Roman number system did not contain a zero. This made it difficult for them to develop many mathematical concepts.