Yes
yes
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.
2.16 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 216/100. You can simplify this rational fraction if you so wish.
It is a rational number. It can be written as a fraction.
There is only one number that equals 216. That number is . . . . . 216.
yes
Is 12.05 a rational number or irrational number?
No, 216 is a composite number.
1.96 is a rational number
19% of 216 = 19% * 216 = 0.19 * 216 = 41.04
It is a rational number, as it can be written as a fraction.
Yes, the sum is always rational.
There is no such thing as a number that is both rational and irrational. By definition, every number is either rational or irrational.
As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.
Yes, it is.