Solution:
As we know π is an irrational number.The value of π is non terminating non repeating.
As we all know , π =,
The fact is still we are getting an irrational number.
As , 0 is a rational number.
So, The number which when added to π, to get a rational number is (-π).
Answer → π + (-π) = 0, i.e (-π) is that number.