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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