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An irrational number is any real number that can not be written in the form A/B, where A and B are integers and B is not 0.
Since .12345 can be written as 12345/100000 (or 2469/20000) it is not an irrational number.
Some of the best known Irrational Numbers are pi, e, and the square root of 2.
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Continue Learning about Algebra
The sum of a rational number and an irrational number is?
The sum of a rational and irrational number must be an irrational number.
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