Yes and an irrational number can't be expressed as a fraction
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Any irrational number can be approximated by decimals. You can never write it exactly, since there are an infinite number of decimals, and these don't repeat.
No. Anything that has a finite number of decimals (or repeating decimals) is a rational number.
Infinitely many. pi is not just an irrational number but a transcendental number. All irrational numbers have infinite decimals that do not go into a recurring pattern.
Yes. Rational numbers are numbers or decimals that repeat or terminate. Irrational numbers do not. For example π is an irrational number.
An irrational number can be represented by a non-terminating, non-repeating decimal.