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The Fractionator Principle. The fractionator principle is one of the important concepts used in stereology. The importance of this principle cannot be overlooked. It appears in many different places. Although it looks different depending on how it is used, the principle is the same.
Â· just now. Report Abuse. In a fraction, the denominator is the number in the bottom part and the numerator is the number on the upper part. If the fractions are similar fractions (meaning they have the same denominator), simply arrange the numerators from least to greatest.