Help building the largest human-edited directory of the web Suggest URL - Open Directory Project - Become an editor

directopedia.org uses links and structure from dmoz Open Directory Project.
The contents has been generating using technology developed by scientec.

Counting is the mathematical action of repeatedly adding (or subtracting) one, usually to find out how many objects there are or to set aside a desired number of objects (starting with one for the first object and proceeding with a one-to-one correspondence). However, counting is also used (primarily by children) to demonstrate knowledge of the number names and the number system.

Counting sometimes involves numbers other than one -- for example, when counting money, or counting out change, or when "counting by twos" (2, 4, 6, 8, 10, 12, ...) or when "counting by fives" ( 5, 10, 15, 20, 25 ...).

There is archeological evidence that humans have been counting for at least 50,000 years [1 - p.9]; the development of counting led to the development of mathematical notation and numeral systems. Counting was primarily used by ancient cultures to keep track of economic data such as debts and capital.

See also

• Combinatorics
• Subitizing and counting
• Tally mark
• Unary numeral system
• Elementary arithmetic
• Counting out change

References

1. An Introduction to the History of Mathematics (6th Edition) by Howard Eves (1990)

This article is based on the article "Counting" from Wikipedia - the free encyclopedia created and edited by online user community. This article is distributed under the terms of GNU Free Documentation License. Here you find the list of authors of this article. The article can only edited within Wikipedia. Edit this article in Wikipedia.

The word numbers can refer to

• Numbers in math
• Telephone numbers
• The "Book of Numbers", part of the Hebrew Bible.
• A Numbers game, a gambling scheme common in poor urban neighborhoods.
• Numb3rs, an American TV show on CBS
• The Numbers in Lost: 4, 8, 15, 16, 23 and 42
  • "Numbers," a focal episode of Season 1 in the series

This article is based on the article "Numbers" from Wikipedia - the free encyclopedia created and edited by online user community. This article is distributed under the terms of GNU Free Documentation License. Here you find the list of authors of this article. The article can only edited within Wikipedia. Edit this article in Wikipedia.