It is said to be 22/7. And it is 3.14 in decimal form.
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pi is a transcendental number which is a kind of irrational number. An irrational number cannot be represented as an exact fraction.
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Pi is an irrational number, so it can not be expressed as an exact fraction. Some estimates in fraction form are 22/7, 333/106, 355/113, and 103993/33102.
Since pi is irrational, there is (by definition) no way to express it as an exact fraction. Even so, many people write it as 22/7, which is a fairly accurate representation. But it is not exact!
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.
An irrational number cannot be written as a fraction or to an exact decimal such as the symbol for pi or the square root of two. A rational number can be written in the form of a fraction or a decimal to an exact value.