It is part of a complex fraction.
The denominator.
denominator
The part of a fraction that is below the line and that functions as the divisor of the numerator
It is the solidus line that separates the numerator from the denominator in a fraction
fraction bar
The denominator in the unsimplified fraction.
It is the number below the division line.
fraction bar
The denominator (the figure below the horizontal line)
It is a fraction if the number below the line is not zero. If the ABSOLUTE value of the number above the line is smaller than the ABSOLUTE value of the number below the line then it is a proper fraction. Otherwise it is an improper fraction.So, -7 is smaller than 2 but -7/2 is not a proper fraction because the absolute value of -7 (which is 7) is not smaller than the absolute value of 2 (= 2).
The number above the line in a fraction is called the numerator. The number below the line is called the denominator. So in the fraction 5/7 5 is the numerator and 7 is the denominator.
Well, darling, that little number below the line in a fraction is called the denominator. It's basically playing second fiddle to the numerator, which gets all the attention. Think of it as the sidekick in the fraction world.