Sometimes, it depends on if it can be written as a ratio, if it can be a ratio, then it is rational.
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
No, irrational numbers can't be expressed as a terminating decimal.
They are irrational.
If it is a terminating or recurring decimal then it is not irrational. If it is an infinite, non-recurring decimal, it is irrational.
A decimal number can be rational or irrational.
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
It is the decimal approximation to the value of the irrational number.
No, irrational numbers can't be expressed as a terminating decimal.
They are irrational.
An irrational number has a decimal representation that is non-terminating and non-repeating.
All irrational numbers have decimal representations which are non-terminating.
Decimal numbers that can't be expressed as fractions are irrational numbers
Casually, irrational numbers have the decimal digits recurring to infinity, AND there is no regular order in the decimal digits.