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Roman Numerals are a numbering system that originated in the ancient Roman Empire and are still in use today in a variety of forms.

The seven main symbols and their equivalents are:

I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1,000

For even higher numbers, an overline (¯) is drawn above the main symbols to indicate multiples of 1000. (note: some phones are unable to display these special characters and they may look identical to the earlier set.)

V = 5,000
X = 10,000
L = 50,000
C = 100,000
D = 500,000
M = 1,000,000

Some basic rules:

-Roman numerals read from left to right, larger values to the left and work to the smaller values on the right.

-If a lesser symbol is before a greater symbol, the lesser is subtracted from the greater. For example, IV=4

-If a lesser symbol is after a greater symbol, the two values are added. For example, VI=6

-I and V can only modify up to an X. For example, 49 is not written IL, rather you first resolve 40 as XL and then resolve 9 as IX. Put them together and 49 = XLIX.

-X and L can only modify up to a C. For example, 490 is not written XD. First you resolve 400 as CD and then you resolve 90 as XC. Put them together and 490 = CDXC.

-C and D can only modify up to an M. For example, 950 is not written LM, rather you first resolve 900 as CM and then add L for 50. So 950 = CML.