yes
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.
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.
There is only one number that equals 216. That number is . . . . . 216.
It is a rational number. It can be written as a fraction.
No, 216 is a composite number.
yes
19% of 216 = 19% * 216 = 0.19 * 216 = 41.04
Is 12.05 a rational number or irrational number?
1.96 is a rational number
216 is not prime. 216 = 2 * 2 * 2 * 3 * 3 * 3
It is a rational number, as it can be written as a fraction.
It is 216 = 65536It is 216 = 65536It is 216 = 65536It is 216 = 65536
63 = 216
Yes, the sum is always rational.