Question

how to distinguish between rational and irrational numbers

Answer 1

A rational number is part of a whole expressed as a fraction, decimal or a percentage It is a number that cannot be written as a ratio of two integers.

irrational: are numbers which cannot be expressed as fraction,decimal or a percentage.
eg: 7/8 or 1/3

Answer 2

Numbers which can be written in the form of p/q are called rational numbers and Numbers which cannot be written in the form of p/q is called irrational numbers