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Yes.

Rational numbers have a terminating decimal digit or a non-terminating recurring decimal digit.

Rational numbers are generally expressed in the form (p/q) where 'q' does not equal 0. 21.09 can be written as (2109/100) which is of the (p/q) form and 'q' is not equal to zero.

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Q: Is 21.09 a rational number
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