It's already part of the rule.
the number on the top of the bar is called the Numerator
The number under the bar is called the Denominator
The Top Of a Fraction is called the Numerator
The number on top of a fraction is called the numerator. It represents the number of parts being considered.
Numerator
It is the numerator.
The number on the top of a fraction is called the numerator. The number on the bottom is the denominator.