Sometimes, it depends on if it can be written as a ratio, if it can be a ratio, then it is rational.
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When a decimal can't be expressed as a fraction then it is an irrational number.
Pi is an irrational number
A decimal rational number can be expressed as a fraction A decimal irrational number can not be expressed as a fraction
They are irrational.
No, irrational numbers can't be expressed as a terminating decimal.