Yes - any proper fraction x/y is a rational number. Expressed as a decimal, this is equal to 0.4 recurring (that is, 0.44444...)
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If you mean 4/9 as a fraction then it is a rational number
41/9 is a rational number because all fractions are rational numbers
1/4, or .25 is rational.
Yes it is.
Yes. Any rational number divided by another rational number is also rational.