Is 0 rational or irrational

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A Rational number is one that CAN be expressed as the division of two Integers.

0/1 = 0

0/2 = 0

...

0/N = 0 ; if N is an Integer different than zero.

etc.

So Zero IS a Rational Number.

Without taking away the truth of this, watch out for:

0/0 which is NOT 0. (some will say this value is Undefined, others will say it is Infinite)

Note that a Rational Number does not have to be an Integer.

i.e. 0.75 is a rational Number since it is 3 divided by 4 (i.e 3/4, or 6/8, etc.).

A Famous NON Rational Number is PI = 3.141592654......

PI is NOT Rational since there are no Integer numbers A and B that divided will yield PI.

PI tells how many diameter lengths are needed to wrap a circle (It is obtained by dividing the perimeter of a circle by its diamater)