Write the Rational Number that does not have a Reciprocal

Q. Write the rational number that does not have a reciprocal.

Answer: 

• The only rational number that does not have a reciprocal is 0. 
• Because we can write 0=0/1.
• But when we write anything upon 0 that is supposed to be 1/0, then the value becomes an infinite or an undefined number. 
• Therefore we can conclude that zero has no reciprocal value.