Common approximations are: 3.14, 22/7 and this one, correct to six places, 355/113 which gives 3.141593.
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It is: 22/7
pi X 25 = 25 pi ( Algebraic. However, if you approximate pi to 3.14159 Then 3.14159 x 25 = 78.53975 If you approximate pi tp 3.13 Then 3.14 x 25 = 78.5
One can define an infinite number of fractions to successively approximate pi, and get closer and closer to pi's value. There is no closest fraction to pi. No matter how close the fraction is to pi you can always find one that is closer.
Pi is an irrational number, meaning that it cannot be written as the ratio of two integers (fractions such as 22/7 are commonly used to approximate pi; no common fraction (ratio of whole numbers) can be its exact value).
Since pi is an irrational number it is impossible to represent the exact quantity as a decimal; you can only give and approximate value. However, if you write a fraction that includes the symbol for pi, you are giving an exact quantity.