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  2. Skip counting - Wikipedia

    en.wikipedia.org/wiki/Skip_counting

    In older textbooks, this technique is called counting by twos (threes, fours, etc.). In skip counting by twos, a person can count to 10 by only naming every other even number: 2, 4, 6, 8, 10. [ 1 ] Combining the base (two, in this example) with the number of groups (five, in this example) produces the standard multiplication equation: two ...

  3. Numbertime - Wikipedia

    en.wikipedia.org/wiki/Numbertime

    The first series, which is aimed at four- to five-year-olds, comprised ten episodes focusing on the numbers 1-10, in order; each episode opened with Lolita introducing herself to the viewer, and pulling the number for the episode off its string (which was hanging from the studio ceiling), then pushing it into its correct hole in a wall, and singing the main theme, One to Ten, as each of its ...

  4. Counting - Wikipedia

    en.wikipedia.org/wiki/Counting

    Number blocks, which can be used for counting. Counting is the process of determining the number of elements of a finite set of objects; that is, determining the size of a set. . The traditional way of counting consists of continually increasing a (mental or spoken) counter by a unit for every element of the set, in some order, while marking (or displacing) those elements to avoid visiting the ...

  5. 20 (number) - Wikipedia

    en.wikipedia.org/wiki/20_(number)

    In some countries, the number 20 is used as an index in measuring visual acuity. 20/20 indicates normal vision at 20 feet, although it is commonly used to mean "perfect vision" in countries using the Imperial system. (The metric equivalent is 6/6.)

  6. 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.

  7. History of ancient numeral systems - Wikipedia

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

    The first row has been interpreted as the prime numbers between 10 and 20 (i.e., 19, 17, 13, and 11), while a second row appears to add and subtract 1 from 10 and 20 (i.e., 9, 19, 21, and 11); the third row contains amounts that might be halves and doubles, though these are inconsistent. [14]

  8. 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]

  9. Finger-counting - Wikipedia

    en.wikipedia.org/wiki/Finger-counting

    Finger-counting systems in use in many regions of Asia allow for counting to 12 by using a single hand. The thumb acts as a pointer touching the three finger bones of each finger in turn, starting with the outermost bone of the little finger. One hand is used to count numbers up to 12. The other hand is used to display the number of completed ...