Question

how will we find a rational and irrational

Answer 1

To find rational numbers and irrational numbers u should know their definition..
Number which can be expressed in the form of p/q is known as rational number.
Number which can't be expressed in the form p/q is known as irrational number.
HOPE this is helpful

Answer 2

Any numbers that are not rational are considered rational and the numbers that are written as a decimal but not in fraction are called irrational