Answer:
An irrational number produces an irrational when added to 

Explanation:
To find : What number produces an irrational when added to 
 ?
 ?
Solution : 
We know that,

It is a rational number as it is repeating.
So, If we add a rational number into a rational number it always gives you a rational number.
To produce an irrational number,
If we add an irrational number to a rational number it always gives you an irrational number.
For example : 
An irrational number - 

A rational number - 

Adding these two number,

This number is non-terminating and non-repeating.
Therefore, An irrational number produces an irrational when added to 
