| building up the denominator | The opposite of reducing a fraction.
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| complex fraction | A fraction that contains a fraction in the numerator, the denominator, or both.
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| cross multiply | If a/b = c/d, then ad = bc.
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| domain of an expression | The set of all real numbers that can be used in place of the variable.
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| extraneous root | A number that appears to be a solution to an equation but does not satisfy the equation.
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| extremes | The numbers a and d in a/b = c/d.
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| extremes-means property | If a/b = c/d, then ad = bc.
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| least common denominator | The LCD of a group of rational expressions is the simplest polynomial that is divisible by each of the individual denominators of the rational expression.
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| least common multiple | For a group of numbers, the smallest number that is a multiple of each number in the group.
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| lowest terms | No common factors.
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| means | The numbers b and c in a/b = c/d.
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| proportion | A statement expressing the equality of two rational expressions.
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| proportionality constant | The constant k in y = kx.
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| ratio | A comparison of numbers that have the same units of measure.
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| rational expression | A ratio of two polynomials with the denominator not equal to 0.
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| reducing | Dividing out common factors.
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2002 McGraw-Hill Higher Education