Roman Number :


Standard Roman Numbers

Roman NumbersIVXLCDM
Indian Numbers1510501005001000



Rules:

1) If the letter is repeated , its value is added as many times as it is repeated .
example : XXX = 10+10+10 = 30

2) A letter of a smaller value, when written to the right of the letter of a bigger value, the smaller value is added to the higher value .
example : XI = 10 +1 = 11 
                LX = 50 + 10 = 60 
                CX = 100 +10 = 110 
                DC = 500 + 100 = 600
3) A letter of smaller value, when written to the left of the letter of bigger value, the smaller value is subtracted from the bigger value. 
Example : IX = 10 -1 = 9
               XL = 50 -10 = 40
               XC =100 -10 = 90
               CD=500-100 = 400

4) If a letter of a smaller value is placed between two letters of bigger value, then it is always subtracted from the letter of a bigger value on its right .
 Example:  XIV = 10 +(5-1) = 14
5) V, L and D are never repeated or subtracted .
 example = LC = 100 -50 -> 50 -> this is wrong. as 50 is wrtitten as L .
          VX =10-5 -> 5 -> this is wrong as 5 is written as V .
6) I can be subtracted from V and X only .

7) X can be subtracted from L and C only .

Exercise: Write roman numbers of numerals.
1)  40 = 50 -10 = XL
2)  60 = 50 + 10 = LX
3)  90 = 100 - 10 = XC
4)  290 = 100+100+100-10 CCXC
5)  230 = 100+100+10+10+10 = CCXXX
6)  490 = 400 + 90 = (500-100 )+ (100-10) = CDXC
7)  510 = 500+10 = DX
8)  988 = 900 + 80 + 8 = (1000 -100)+50+10+10+10+8 = CMLXXXVIII
9)  1010 = 1000 + 10 = MX

Exercise : Write numeral of Roman Numbers.
1)  LXXXIX = 50+10+10+10+ (-1 +10) = 89
2)  CXXV = 100 +10+10+5 = 125
3)  CDXCIX = (-100 + 500)+ (-10 +100) + (-1 +10) = 400+90+9 = 499
4)  CXC = 100 + (-10 + 100) = 100 +90 = 190
5)  DCLXXXVI = 500 + 100 + 50 +10+10+10+5+1 = 686
6)  XLIX = (-10 +50) +(-1+10) = 40+9 = 49
7)  CMXCIX = (-100 + 1000)+(-10 +100)+(-1+10) = 900+90+9 = 999

1.Write roman numbers of numerals.

1)   345  

2)   298  

3)   3339  

4)   845  

5)   1990  

6)   1490  

7)   965  

8)   89  

9)   319  

10)   3999  






2.Write numerals of following roman numbers .

1)   MCM  

2)   XLVII  

3)   DCLIX  

4)   DCCLXXVII  

5)   MXCIX  

6)   MCXC  

7)   XCI  

8)   CDIX  

9)   XIX  

10)   CCCXL