he Roman numeral system works by having separate symbols to represent different numbers but unlike our system there was no symbol for zero. Essentially we have 9 numbers and then add a zero on the end to denote 10s, two zeros to denote 100s and so on. the Romans simply had additional symbols to denotes 10s, 100s etc. Examples of Roman numerals and how they are worked out follows...
1 = I
2 = II (1 + 1)
3 = III (1+ 1 + 1)
4 = IV (1 before 5)
5 = V
then the system repeats...
6 = VI (5 + 1)
7 = VII (5 + 1 + 1)
8 = VIII (5 + 1 + 1 + 1)
9 = IX (1 before 10)
10 = X
Additional numerals exist for 50 (L), 100 (C), 500 (D) and 1000 (M) and they work on the same system so, for example...
XX = 20
XXX = 30
XL = 40
CCC = 300
CD = 400
CM = 900
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Hindu-Arabic basic numeral symbols are: 0 1 2 3 4 5 6 7 8 and 9 Roman basic numeral symbols are: I V X L C D and M
The largest value Roman numeral that you can write, which conforms to the rules of writing Roman numerals, using just D, C and L symbols is DCCCL (850)
The basic Roman numerals and values are: M=1000, D=500, C=100, L=50, X=10, V=5 and I=1
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The Roman numeral system was derived from the Etruscan numeral system and the Etruscans once ruled the Romans. The Etruscan numerals consisted of symmetrical symbols to represent certain numerical values and when the Romans came to power they replaced these symbols with letters that were easier to write out.