A to F   G to M   N to T   U to Z   See also: - e - Integer Numbers - Natural Numbers - Pi - Rational Numbers - Real Numbers - Root Maths Irrational Numbers An irrational number is any number that cannot be expressed as the ratio of two whole (integer) numbers. You can never exactly write down an irrational number as a decimal number - there are simply an infinite number of decimal places. Examples of irrational numbers include e and .   The term surd can be applied to irrational roots or sums of irrational roots.

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