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December 10th, 2010, 05:24 AM  #1 
Member Joined: Nov 2010 Posts: 34 Thanks: 0  Roman counting system
The basis of the Roman numerical system is counting on the fingers indicates that the Latin word "Jigitus" where we use word is derived from "digit" .Romans wrote numbers from one to four as follows the symbol which represent five is v may represent the gap between the thumb and the rest of the fingers In order to avoid writing number 4 ( iiii) ,they used the place value for symbol ,so if was written to the left of the symbol another symbol bigger than it means the Sum of the two numbers and is was written to the right of the symbol another symbol bigger than it means difference between the two numbers .numbers 6 , 7 , 8 are To write 10 they used symbol X , so by using the former rule 9 = IX , 11 = XI , 12= XII , 13= XIII , 14= XVI , 15 = XV , 16 = XVI , 17 = XVII , 18= XVIII , 19 = XIX , 20= XX and 30 = XXX In order to avoid writing number 40 = XXXX they used L to represent 50 so 40 = XL , 60 = LX and so on. To write 100 they used symbol C ,so 90 = XC , 120 = CXX ,150= CL and 200 = CC. To write 500 they used D ,so CD = 400 , DC = 600 and 700 = DCC . They used M to write 1000 ,so 900 = CM , 1100 = MC and 1300 = MCCC. now to write 1408 by using Roman counting system = MXDVIII To write 1564 = MDLXIV To write 2010= MMX. 
December 10th, 2010, 06:31 AM  #2  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Roman counting system Quote:
Quote:
    / / / / / /X where the different marks help you count when the numbers get large. Quote:
Worth noting  though you surely know  you can only subtract the next smaller tens place. VX and IC aren't allowed. Quote:
 

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