A fraction expressed as a part of 100.

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Multiple Choice

A fraction expressed as a part of 100.

Explanation:
Expressing a fraction as a part of 100 means you're turning it into a percentage, because a percentage is just a fraction with denominator 100. For example, 45 out of 100 is written as 45 percent, or 45%. The other terms don’t fit this idea: the denominator is simply the bottom number of a fraction, a unit is a single item, and diameter refers to a circle’s width across. So the term that matches “a fraction expressed as a part of 100” is percentage.

Expressing a fraction as a part of 100 means you're turning it into a percentage, because a percentage is just a fraction with denominator 100. For example, 45 out of 100 is written as 45 percent, or 45%. The other terms don’t fit this idea: the denominator is simply the bottom number of a fraction, a unit is a single item, and diameter refers to a circle’s width across. So the term that matches “a fraction expressed as a part of 100” is percentage.

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