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  2. 25 (number) - Wikipedia

    en.wikipedia.org/wiki/25_(number)

    25 is the sum of the five consecutive single-digit odd natural numbers 1, 3, 5, 7, and 9. 25 is a centered octagonal number, [1] a centered square number, [2] a centered octahedral number, [3] and an automorphic number. [4] 25 percent (%) is equal to ⁠ 1 / 4 ⁠. It is the smallest decimal Friedman number as it can be expressed by its own ...

  3. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages.Numbers are written with combinations of letters from the Latin alphabet, each with a fixed integer value.

  4. Number Forms - Wikipedia

    en.wikipedia.org/wiki/Number_Forms

    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 Five Hundred 216E 8558 Ⅿ M: 1000 Roman Numeral One Thousand 216F 8559 ⅰ i: 1 Small Roman Numeral One 2170 8560 ⅱ ii: 2 Small Roman Numeral Two 2171 8561 ⅲ iii: 3 Small Roman Numeral Three 2172 ...

  5. 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]

  6. Roman numeral analysis - Wikipedia

    en.wikipedia.org/wiki/Roman_numeral_analysis

    The accompaniment performers translate the Roman numerals to the specific chords that would be used in a given key. In the key of E major, the diatonic chords are: E maj7 becomes I maj7 (also I ∆7, or simply I) F ♯ m 7 becomes II m7 (also II −7, II min7, IIm, or II −) G ♯ m 7 becomes III m7 (also III −7, III min7, IIIm, or III −)

  7. Regional handwriting variation - Wikipedia

    en.wikipedia.org/wiki/Regional_handwriting_variation

    In "old style" text figures, numerals 0, 1 and 2 are x-height; numerals 6 and 8 have bowls within x-height, plus ascenders; numerals 3, 5, 7 and 9 have descenders from x-height, with 3 resembling ʒ; and the numeral 4 extends a short distance both up and down from x-height. Old-style numerals are often used by British presses.

  8. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Octal: Base 8, occasionally used by computer system designers and programmers. Duodecimal: Base 12, a numeral system that is convenient because of the many factors of 12. Sexagesimal: Base 60, first used by the ancient Sumerians in the 3rd millennium BC, was passed down to the ancient Babylonians. See positional notation for information on ...

  9. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    The use of a round symbol 〇 for zero is first attested in the Mathematical Treatise in Nine Sections of 1247 AD. [7] The origin of this symbol is unknown; it may have been produced by modifying a square symbol. [8] The Suzhou numerals, a descendant of rod numerals, are still used today for some commercial purposes. [citation needed]