There are several sets of numbers, which will be discussed below.
The set of real numbers
Rational and irrational numbers form the real numbers. They are numbers that can be represented in the form of infinite decimal fractions.
The set of Complex numbers
It is numbers of the form , where ; is the imaginary unit.
The set of Rational numbers
Combining whole numbers with a decimal, get a rational number
Rational numbers can be represented in the form of irreducible fraction , where integer is a natural number written as infinite periodic decimal fractions).
The set of Irrational numbers
They are numbers that can be written in the form of an infinite non-periodic decimal fractions.
The set of integers
Include natural numbers, their opposites numbers (negative) and the number .
The set of natural numbers
They are positive integers.
It's a numbers composed of integer fractions of a unit.
— common fractions; — decimals