Denominator

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Denominator is the name for the bottom part of a fraction. It tells you how many equal parts make up a whole, and is also used in the name of the fraction: "halves", "thirds", "quarters", "fifths", "sixths" and so on. The reduced fraction for a rational must have an integer denominator. By convention the denominator is made to be positive (any factor of -1 can be multiplied out into the numerator). For example,

\frac{a}{-b} = 1 \times \frac{a}{-b} = \frac{-1}{-1} \times \frac{a}{-b} = \frac{-1 \times a}{-1 \times -b} = \frac{-a}{b}.

If we take the fraction: \frac{2}{3}.

3 is the denominator and the name of the fraction is "two thirds" (or, more generally, "two over three").

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