Which of the following is a method to express a common fraction as a decimal?

The method to express a common fraction as a decimal involves dividing the numerator by the denominator. This process converts the fraction into a decimal format by determining how many times the denominator fits into the numerator. For example, taking the fraction 3/4, dividing 3 by 4 results in 0.75, which is the decimal representation of that fraction. This method provides an accurate decimal equivalent for any fraction, illustrating the direct relationship between the two forms of numerical representation.

Other methods, such as rounding the fraction to the nearest whole number or converting the denominator to 10, may provide approximations or different results, but they do not consistently yield the precise decimal value of the original fraction. Multiplying the fraction by 100 could transform it into a percentage rather than directly converting it into a decimal. Therefore, the most straightforward and reliable method for converting a fraction to a decimal is indeed dividing the numerator by the denominator.