Which term is used to denote a comparison of a part to a whole in terms of 100?

The concept you are examining pertains to how we express a part in relation to a whole using a universal scale of 100. A percentage directly denotes this comparison, indicating how much of the whole value is represented by the part. For instance, if a student scores 75 out of 100 on a test, we can express this as 75%, which provides a clear understanding of performance as a portion of a whole, making it easier to interpret results in a standardized way.

On the other hand, while ratio, fraction, and decimal can also indicate relationships between numbers, they do not inherently express that relationship in terms of 100. A ratio compares two quantities directly, a fraction represents a part of a whole but can be expressed in various ways beyond just 100, and a decimal conveys a value but does not specifically represent the whole in terms of percentage. Thus, the term that fits the definition of comparing a part to a whole specifically in terms of 100 is indeed percentage.