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  2. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    In tarot, Roman numerals (with zero) are often used to denote the cards of the Major Arcana. In Ireland, Roman numerals were used until the late 1980s to indicate the month on postage Franking. In documents, Roman numerals are sometimes still used to indicate the month to avoid confusion over day/month/year or month/day/year formats.

  3. Number Forms - Wikipedia

    en.wikipedia.org/wiki/Number_Forms

    Roman Numeral Seven 2166 8550 Ⅷ VIII: 8 Roman Numeral Eight 2167 8551 Ⅸ IX: 9 Roman Numeral Nine 2168 8552 Ⅹ X: 10 Roman Numeral Ten 2169 8553 Ⅺ XI: 11 Roman Numeral Eleven 216A 8554 Ⅻ XII: 12 Roman Numeral Twelve 216B 8555 Ⅼ L: 50 Roman Numeral Fifty 216C 8556 Ⅽ C: 100 Roman Numeral One Hundred 216D 8557 Ⅾ D: 500 Roman Numeral ...

  4. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    "A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]

  5. 9 - Wikipedia

    en.wikipedia.org/wiki/9

    9 is the fourth composite number, and the first odd composite number. 9 is also a refactorable number. [ 2 ] Casting out nines is a quick way of testing the calculations of sums, differences, products, and quotients of integers in decimal , a method known as long ago as the 12th century.

  6. Roman numeral analysis - Wikipedia

    en.wikipedia.org/wiki/Roman_numeral_analysis

    Roman numerals are sometimes complemented by Arabic numerals to denote inversion of the chords. The system is similar to that of Figured bass, the Arabic numerals describing the characteristic interval(s) above the bass note of the chord, the figures 3 and 5 usually being omitted. The first inversion is denoted by the numeral 6 (e.g.

  7. Sign-value notation - Wikipedia

    en.wikipedia.org/wiki/Sign-value_notation

    Subtractive notation represents numbers by a series of numerals in which signs representing smaller values are typically subtracted from those representing larger values to equal the value of the number represented. In Roman numerals, for example, I means one and X means ten, so IX means nine (10 − 1).

  8. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    The first true written positional numeral system is considered to be the Hindu–Arabic numeral system.This system was established by the 7th century in India, [1] but was not yet in its modern form because the use of the digit zero had not yet been widely accepted.

  9. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    The Roman numerals developed from Etruscan symbols around the middle of the 1st millennium BCE. [34] In the Etruscan system, the symbol 1 was a single vertical mark ...