Denominator
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The denominator of a fraction is the number under the horizontal bar, or vinculum. It represents the amount of parts in an object. The denominator can never be zero. An expression such as 
, will be undefined, because the denominator equals 
.
If the absolute value of the denominator is greater than the absolute value of the numerator of a fraction, it is a proper fraction. If it is the other way around, the fraction is improper.
