Final answer:
0.33 is a rational number because it can be expressed as the fraction 33/100.
Step-by-step explanation:
The number 0.33 is a rational number. A rational number is a number that can be expressed as the quotient of two integers, where the denominator is not zero. In this case, 0.33 can be written as the fraction 33/100. Both 33 and 100 are integers, and the denominator is not zero. Therefore, 0.33 is a rational number.