Final answer:
A rational number can be written as a fraction. For example, 3/4 is a rational number. To determine if a number is rational, check if it can be represented as a fraction.
Step-by-step explanation:
A rational number is a number that can be written as a fraction, where the numerator and denominator are both integers.
An example of a rational number is 3/4. To determine if a number is rational, we need to check if it can be represented as a fraction. If it can, then it is rational.
For example, the number 0.5 can be written as 1/2, so it is a rational number.