Which of the following can be used to convert a fraction into a decimal?

The method of long division is the correct approach to convert a fraction into a decimal. When you perform long division on a fraction, you divide the numerator (the top number) by the denominator (the bottom number). This process systematically breaks down the fraction into its decimal equivalent by showing how many times the denominator fits into the numerator and determining the decimal values through the remainder.

To illustrate, if you have the fraction 3/4, you would divide 3 by 4 using long division. 4 does not go into 3, leading to a remainder, so you can add a decimal point and a zero to continue the division. Eventually, you'll find that 3/4 equals 0.75 in decimal form.

Other methods listed, such as prime factorization and exponential growth, do not serve the purpose of converting fractions to decimals. Prime factorization is useful in simplifying fractions but doesn't directly lead to their decimal form, while exponential growth involves increasing quantities over time in a multiplicative manner and is unrelated to the division of numbers. Rounding applies to decimal numbers to simplify them, but it does not provide a method for converting fractions to decimals. Thus, long division stands out as the direct and appropriate method for achieving this conversion.