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It is a rational number - a ratio of two integers - that is sufficiently close to an irrational number so as to be used instead. Calculators and computers- unless using double precision - usually store Irrational Numbers to 16 digits. In schools, for example, pi is often approximated by 22/7. Later on 3.142 ( = 3142/1000) or 3.14159 ( = 314159/100000) may be used. Yet another ratio, which is accurate to 7 digits, but is not used much, is 355/113.

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