Final answer:
The fraction 2/3 is a rational number because it can be expressed as a ratio of two integers, 2 and 3, with the denominator not being zero.
Step-by-step explanation:
The fraction 2/3 is a rational number because it can be expressed as a ratio of two integers. In mathematics, a rational number is any number that can be written as a fraction ð¼ a/b, where a and b are integers, and b is not zero. Since 2 and 3 are both integers and 3 is not zero, 2/3 meets these criteria. Furthermore, although some behaviors may appear as 'irrational,' when it comes to numbers, being 'irrational' has a specific mathematical definition that does not apply to the fraction 2/3.