**Ratio**

The result of dividing one number or expression by another. Sometimes a ratio is written as a proportion, such as 3:2 (three to two). More often, though, ratios are simplified according to the standard rules for simplifying fractions or rational expressions.

Note: The word "rational" indicates that a ratio (in the second sense) is involved. The word *rate* also indicates a ratio is involved, as in instantaneous rate of change or average rate of change.

**See also**

Common ratio, rational numbers, ratio indentities, ratio test, rational equation, rational exponents, rational expression, rational function, rational root theorem, rationalizing substitution, rationalizing the denominator

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