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 . As the denominator of a fraction gets smaller, the value of the fraction will get larger. Conversely, as the denominator of a fraction gets larger, the value of the fraction gets smaller.
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.