Question

How can u determine if a number is a rational number

Answer 1

If the number can be written as a ration (fraction) in
`(a)/(b)` form, it is rational.

All integers can be written in that form : for example - 7 =
`(-7)/(1) = (7)/(-1) = (-21)/(3)` and so on.
Repeaters such as .333... can also be written in fraction form. It is another lesson to explain how, but you can prove it to yourself by dividing 1 by 3
You will get repeating 3's so that means repeating three are the same as the rational number 1/3

What you cannot write as a ratio (fraction form) is a number like √5 because the answer is a number that does not repeat and keeps going on forever. There is no
exact number that when multiplied by itself gives you 5. ∨5 is irrational.