What is 2/3 expressed as a percent?

To express a fraction as a percent, you divide the numerator by the denominator and then multiply the result by 100. For the fraction 2/3, you start by dividing 2 by 3, which gives you approximately 0.6667. To convert this decimal to a percentage, you multiply by 100. This calculation results in 66.67%.

Therefore, 2/3 as a percent is 66.67%, making it the correct answer. This method of converting fractions to percentages is a fundamental skill in mathematics, especially useful in fields such as nursing, where understanding percentages can impact dosages and other critical calculations.