22/7 is fairly accurate to 2 decimal places: 3.14 and it the most commonly used one.
333/106 is accurate to the first 4 decimal places: 3.1415
355/113 is accurate to the first 6 decimal places: 3.141592
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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.
It is: 22/7
Because 22/7 is the approximate value of pi as a fraction but the exact value of pi has never been determined.
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).
22/7 No! It's a joke. There is no fraction value for pi. Pi is an irrational number, meaning that it cannot be represented in fractional form.