It is: 22/7
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pi is a transcendental number, which is a kind of irrational number. As a result it cannot have a fractional form. A convenient approximate fraction is 22/7 so that pi/2 would be approx 11/7 (which is about 0.04% too large).
Any number can be put in fraction form
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).
358 is in its simplest form, but it is a whole number and not a fraction.
mm is not a number and so, in itself, it cannot have a fraction form.