Friday, May 31, 2019

Roman Numerals

Roman Numerals

*) Table :

     Romans : Counting No.   :  Number Name
  1. I       :       1           :    One
  2. II      :      2            :    Two
  3. III    :       3            :   Three
  4. IV    :       4            :    Four
  5. V      :       5            :    Five
  6. VI    :       6            :     Six
  7. VII   :       7            :    Seven
  8. VIII :       8            :     Eight
  9. IX    :       9            :     Nine
  10. X      :     10            :     Ten
  11. XXX :    30            :     Thirty
  12. XL    :    40            :      Forty
  13. L      :     50            :      Fifty
  14. XC   :      90           :      Ninety
  15. C      :    100           :      Hundred
  16. D     :     500          :       Five Hundred
  17. M     :   1000         :       Thousand
Note:
1. "C" (Centum) ---> Hundred
2. "M" (Mille)     ---> Thousand
3. A bar on a Roman Numeral means multiplying that Number by 1000.
4.  If large numbers come before the smaller ones , they are added.
     E.g. VI = 5 + 1 = 6 (bcuz V = 5 ; I =1)
             LX = 50 + 10 = 60
5.  If smaller numbers come before the larger ones, they are subtracted.
      E.g.  IV = V - I = 5 - 1 = 4 
              XL = L - X = 50 - 10 = 40
6.  No digit is repeated more than thrice.
      E.g. CXXXX =140 (x) ; CXL =140 (✓)
7.  "V " , "L" and "D" (all these Numerals are starting will 5) are never subtracted.
8. "I" can be subtracted from "V" and "X" , once only .
9. "X" can be subtracted from "L" and "C" , once only.
10. "C" can be subtracted from "D" and "M", once only.

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