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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.
Multiply the numerators of the fractions. The numerator is the number on the top of a fraction and the denominator is the number on the bottom. The first step to multiplying fractions is to line them up so that their numerators and denominators are next to each other.