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Roman Number SystemRoman number system: We have been using the HinduArabic numeral system so far. This is not the only system available. One of the early systems of writing numerals is the system of Roman number system. This system is still used in many places.
Unlike the HinduArabic Numeral System, Roman Numeral System uses 7 basic symbols to represent different numbers. The symbols are as follows : I = 1 V =5 X= 10 L = 50 C =100 D=500 M= 1000 Rules to form Roman Numerals : 1) If symbol is repeated then its value is added. 2)The symbols I,X,C and M can be repeated maximum 3 times. 3)The symbols V,L and D can never be repeated. 4)If a symbol with smaller value is written on right of greater value then smaller value is added to the greater one. 5)If a symbol with smaller value is written on left of greater value then smaller value is subtracted from the greater one. Example : 1) Write equivalent Roman numerals of a) 29 b) 395 c)62 Solution : a) 29> XXIX b)395 > CCCXCV c) 62 > LXII Example: 2) Write a) XLIV b)DCC in HinduArabic numerals. Solution : a)XLIV > 44 b)DCC > 700 Example : 3) Add XXII + CD Solution : XXII = 22 CD = 400 XXII + CD = 22 +400 = 422 Example : 4)Add XLIV + LIV Solution : XLIV = 44 LIV = 54 ∴ XLIV + LIV = 44 + 54 = 98 98 = XCVIII Example : 5) Subtract DCC  L$\chi \chi\chi$V Solution : DCC = 700 L$\chi \chi\chi$V = 85 ∴DCC  L$\chi \chi\chi$V = 700  84 = 616 616 = DCXVI Number System • Roman number system • International System of Numeration • Rounding Numbers
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