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Irrational numbers can never be expressed exactly using decimal notation with a finite number of digits.  Instead it is common to write them using only enough significant digits to solve the problem at hand, followed by an ellipsis:
 
Irrational numbers can never be expressed exactly using decimal notation with a finite number of digits.  Instead it is common to write them using only enough significant digits to solve the problem at hand, followed by an ellipsis:
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:pi equals 3.14159...
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:pi equals 3.1415926...
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For many purposes, a good approximation of pi is:
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355 / 113 = 3.1415929...
    
==See also==
 
==See also==
 
[[Transcendental numbers]]
 
[[Transcendental numbers]]
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