To which subset of real numbers does the number 1/3 belong?

In mathematics, a rational number is any number that can be expressed as the quotient or fraction p/q of two integers, with the denominator q not equal to zero. Since q may be equal to 1, every integer is also a rational number.

The subset of real numbers that the number 1/3 belongs is to the rational numbers. These numbers is a number that can be written as a ratio. The numerator and the denominator of the fraction are both integers.