Which of the following expressions correctly represents finding what number is a given percentage of another number?

The expression that correctly represents finding what number is a given percentage of another number is when you calculate the part based on the percentage and the whole. When you use the formula "Part = Percentage × Whole," you are determining a specific quantity (the part) that corresponds to a certain percentage of the whole number.

For example, if you want to find out what 20% of 50 is, you would multiply 0.20 (which is the decimal equivalent of 20%) by 50 (the whole). This calculation gives you the part of the whole, which in this case would be 10.

This formula emphasizes the relationship between the percentage, the whole from which it is derived, and the resultant part, providing a clear method for such calculations, which is fundamental in understanding percentage problems in mathematics.