Roman number

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Number to Roman Numeral Converter

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 READING AND WRITING ROMAN NUMERALS

 I=1 V=5 X=10 L=50 C=100 D=500 M=1000 

READING ROMAN NUMERALS 

Rule #1: When reading Roman Numerals, the value of the number is added from left to right if the left numeral is greater than or equal to the right numeral. 

Examples: 

1. II = (1+1) = 2 

2. XX = (10+10) = 20 

3. CII = (100+1+1) = 102 

4. DCLX = (500+100+50+10) = 660 

Rule #2: If the left numeral is smaller than the right numeral, subtract the value of the left value from the right numeral. 

Examples: 

1. IX = 10 – 1 = 9 

2. XXIV = (10 + 10 + (5 – 1)) = 24 

3. CCXCIX = (100 + 100 + (100 – 10) + (10 – 1)) = 299 

4. MCMCDVII = (1000 + (1000 – 100) + (500 – 100) + 7) = 1947

WRITING ROMAN NUMERALS  

Numbers cannot be written by repeating a single numeral more than three times. You need to use Roman numeral strategies to write these numbers. 

Examples: 

IV = 4 

IX = 9 

XC = 90 

CD = 400 

LX = 60  

When writing a numeral express each part of the number as if it were written in expanded notation. Examples: 

1) 65 = 60 + 5 

so we write LX (60) + V (5) or LXV 

2) 49 = 40 + 9 

so we write XL (40) + IX (9) or XLIX 

3) 345 = 300 + 40 + 5 

so we write CCC (300) + XL (40) + V (5) or CCCXLV 

4) 827 = 800 + 20 + 7 

so we write DCCC (800) + XX (20) + VII (7) or DCCCXXVII 

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