It is 4/9.
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Yes.
It is a rational number because it can also be expressed as a fraction
a terminating or recurring decimal fraction.
that is called an irrational number
Any number that can be written as a fraction:15.2=152/10 etc. Any number without a decimal or fraction: 15. Any numbers with decimal numbers that end (4, 2.5) or repeat (1/3, 55/9).