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Roman Numerals

The Romans were active in trade and commerce, and from the time of learning to write they needed a way to indicate numbers. The system they developed lasted many centuries, and still sees some specialized use today.

The big differences between Roman and Arabic numerals (the ones we use today) are that Romans didn't have a symbol for zero, and that numeral placement within a number can sometimes indicate subtraction rather than addition.

 Roman Numerals
1I 2II 3III 4IV 5V 6VI 7VII 8VIII 9IX 10X
11XI 12XII 13XIII 14XIV 15XV 16XVI 17XVII 18XVIII 19XIX 20XX
30XXX 40XL 50L 60LX 70LXX 80LXXX 90XC 100C 200CC 300CCC
400CD 500D 600DC 700DCC 800DCCC 900CM 1000M 2000MM 3000MMM 4000MMMM

Larger numbers were indicated by putting a horizontal line over the relevant number, which multiplied it's value by 1000. Hence 5000 would be represented by a V with a line above it, and so on.


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