Roman numerals
An ancient European number system. The seven key symbols in Roman numerals are I (1), V (5), X(10), L (50), C(100), D (500) and M (1000). There is no zero in this system.

The first ten Roman numerals are I, II, III, IV, V, VI, VII, VIII, IX and X. When using a group of Roman numerals to represent a quantity, the represented value can be obtained by adding the values of the individual symbols when a Roman symbol is proceeded by one of equal or greater value. When a symbol is proceeded by a symbol of less value, the represented quantity is obtained by subtracting the values of individual symbols. For example, VI = 5 + 1 = 6 while IV = 5 - 1 = 4.

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