Arabic and Roman numbers,

Since some people use also Roman numbers and there a many who does not use, when I thought that I will add some information about them to my blog. It helps also self me, since always I like to mix up self 50 and 500 :) Also I find Roman numbers facinating, something what would not be used much in everyday. Here is also bit information about Roman numbers:

Roman numerals are a numeral system of ancient Rome based on letters of the alphabet, which are combined to signify the sum of their values. The Roman numeral system is decimal but not directly positional and does not include a zero. It is a cousin of the Etruscan numerals, and the letters derive from earlier non-alphabetical symbols; over time the Romans came to identify the symbols with letters of their Latin alphabet. The system was modified slightly during the Middle Ages to produce the system used today.

Roman numerals are commonly used in numbered lists (such as the outline format of an article), clock faces, pages preceding the main body of a book, chord triads in music analysis, the numbering of movie publication dates, months of the year, successive political leaders or children with identical names, and the numbering of annual events.



Arabic Numbers: 1 2 3 4 5 6 7 8 9 10
Roman Numerals: I II III IV V VI VII VII IX X
Arabic Numbers: 15 20 30 40 50 60 70 80 90 100 500 1000
Roman Numerals: XV XX XXX XL L LX LXX LXXX XC C D M


The basic multiples of Roman numerals thus follow a pattern:

Multiplies: ×1 ×2 ×3 ×4 ×5 ×6 ×7 ×8 ×9
Ones: I II III IV V VI VII VIII IX
Tens: X XX XXX XL L LX LXX LXXX XC
Hundreds: C CC CCC CD D DC DCC DCCC CM
Thousands: M MM MMM IV V VI VII VIII IX
Ten thousands: X XX XXX XL L LX LXX LXXX XC
Hundred thousands: C CC CCC CD D DC DCC DCCC CM