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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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Q: Is a decimal irrational

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When a decimal can't be expressed as a fraction then it 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

An irrational number has a decimal representation that is non-terminating and non-repeating.

irrational, if it's is not tons of #s after the decimal that means its terrminating irrational

A decimal is an irrational number when it can't be expressed as a fraction.

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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.

Pi is an irrational number

When a decimal can't be expressed as a fraction then it 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.

It is the decimal approximation to the value of the irrational number.

All irrational numbers have decimal representations which are non-terminating.

Decimal numbers that can't be expressed as fractions are irrational numbers

An irrational number has a decimal representation that is non-terminating and non-repeating.

No it is not.

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