Yes because it can be expressed as a fraction in the form of 66/25
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yes
x.xxx is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 264/100. You can simplify this rational fraction if you so wish.
Yes.
yes
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.