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  2. Skip counting - Wikipedia

    en.wikipedia.org/wiki/Skip_counting

    Skip counting is a mathematics technique taught as a kind of multiplication in reform mathematics textbooks such as TERC. 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]

  3. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    In base 10, ten different digits 0, ..., 9 are used and the position of a digit is used to signify the power of ten that the digit is to be multiplied with, as in 304 = 3×100 + 0×10 + 4×1 or more precisely 3×10 2 + 0×10 1 + 4×10 0. Zero, which is not needed in the other systems, is of crucial importance here, in order to be able to "skip ...

  4. The Kodansha Kanji Learner's Dictionary - Wikipedia

    en.wikipedia.org/wiki/The_Kodansha_Kanji_Learner...

    The SKIP method encodes Kanji into four main categories: Left-Right, Up-Down, Enclosure, and Whole; and then by stroke count (or by subtype of the Whole category). The SKIP method used by The Kodansha Kanji Learner's Dictionary is an original system for indexing kanji, meant to be accessible to those who have no prior knowledge of them. Instead ...

  5. Yan tan tethera - Wikipedia

    en.wikipedia.org/wiki/Yan_tan_tethera

    Yan Tan Tethera or yan-tan-tethera is a sheep-counting system traditionally used by shepherds in Northern England and some other parts of Britain. [1] The words are numbers taken from Brythonic Celtic languages such as Cumbric which had died out in most of Northern England by the sixth century, but they were commonly used for sheep counting and counting stitches in knitting until the ...

  6. 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 ...

  7. Tally marks - Wikipedia

    en.wikipedia.org/wiki/Tally_marks

    Tally marks, also called hash marks, are a form of numeral used for counting. They can be thought of as a unary numeral system. They are most useful in counting or tallying ongoing results, such as the score in a game or sport, as no intermediate results need to be erased or discarded. However, because of the length of large numbers, tallies ...

  8. Skip list - Wikipedia

    en.wikipedia.org/wiki/Skip_list

    To index the skip list and find the i'th value, traverse the skip list while counting down the widths of each traversed link. Descend a level whenever the upcoming width would be too large. For example, to find the node in the fifth position (Node 5), traverse a link of width 1 at the top level.

  9. History of ancient numeral systems - Wikipedia

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

    As understood through analyses of early proto-cuneiform notations from the city of Uruk, there were more than a dozen different counting systems, [18] including a general system for counting most discrete objects (such as animals, tools, and people) and specialized systems for counting cheese and grain products, volumes of grain (including ...

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