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...Two types of numbers arabic the we normally use roman invented by romans and still used today i v x l c d m hx numerals strictly represented units as separate items in their they were depicted on an abacus a calculating machine using pebbles or beads which arranged from right to left columns tens hundreds thousands etc continued that means could be xcix but never ic xc subtracted ix cannot im is not legal cmxcix cm therefore you must learn numeral rules can t add more than same letters at one time ex iv iiii biggest possible each stage xv vvv xiiiii smaller value letter larger xxxiv xxxiiii...