A number is a concept that arises from the result to have things that are an aggregate or a generalization of this concept.

The numbers are used to count and measure. Signs used to represent The numbers in numeration system called numbers, but usually the word number It is used to designate both the concept and the sign. Policies in mathematical concept of number it has become more widespread and includes numbers such as 0, negative numbers, rational numbers, irrational numbers, and complex numbers.

A rule that enables a number of a set, from a pair of numbers in the same set, operation it called. Examples of operations are addition, subtraction, multiplication, the divide and power The science of numbers is arithmetic. The numbers came in prehistory, with the need, especially economically reasons, objects and belongings. However, there are cultures which have not developed a system numeration, and solely concepts have one, two (or plural) and many.