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  2. Number line - Wikipedia

    en.wikipedia.org/wiki/Number_line

    The order of the natural numbers shown on the number line. A number line is a graphical representation of a straight line that serves as spatial representation of numbers, usually graduated like a ruler with a particular origin point representing the number zero and evenly spaced marks in either direction representing integers, imagined to extend infinitely.

  3. Printer's key - Wikipedia

    en.wikipedia.org/wiki/Printer's_key

    This is how the printer's key may appear in the first print run of a book. In this common example numbers are removed with subsequent printings, so if "1" is seen then the book is the first printing of that edition. If it is the second printing then the "1" is removed, meaning that the lowest number seen will be "2". [3]

  4. 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.

  5. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

  6. Tally marks - Wikipedia

    en.wikipedia.org/wiki/Tally_marks

    In the dot and line (or dot-dash) tally, dots represent counts from 1 to 4, lines 5 to 8, and diagonal lines 9 and 10. This method is commonly used in forestry and related fields. [ 6 ]

  7. List of integer sequences - Wikipedia

    en.wikipedia.org/wiki/List_of_integer_sequences

    This is a list of notable integer sequences with links to their entries in the On-Line Encyclopedia of Integer ... Tetrahedral numbers T(n) 0, 1, 4, 10, 20, 35, 56 ...

  8. Alphabetic numeral system - Wikipedia

    en.wikipedia.org/wiki/Alphabetic_numeral_system

    The first line contains the number " ... in order to write any number from 1 through 59. These could be a numerator of a fraction. ... (20 x 1/60) + (15 x 1/3600 ...

  9. Numbertime - Wikipedia

    en.wikipedia.org/wiki/Numbertime

    Episode 1: Number 1 (20 September 1993) [1] ... Episode 20: In, Out, and Through ... whose number line had been replaced by a number square, ...