No, it is a rational number, as it can be expressed as a fraction, being one third.
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it is irrational
yes
No.
rational
If the decimal of a fraction either terminates or ends with a repeating cycle of digit(s) then it is a rational number; otherwise it does not terminate nor does it have a repeating cycle of digit(s) at the end and is irrational. 0.12345 terminates as so it rational If that was repeating, as in 0.123451234512345..., then it is still rational.