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.
Yes. Any rational number divided by another rational number is also rational.
395 is an odd number
393 395 397
234 395
There is nu number before another because the set of numbers is infinitely dense. If you claim that x1 is the number before 395, then what about x2 = (x1 + 395)/2? Then x1 < x2 < 395 that is, x2 is before 395 and nearer to it. And then what about x3 = (x2 + 395)/2 and then x4 etc defined similarly?
573
395*163/100 = 643.85
It is a rational number. It can be written as a fraction.
234 395
395/16 = 2411/16
45
yes
Is 12.05 a rational number or irrational number?