the reciprocal to a number...turn the number u have into a fraction, if it is not already one.
1/2...reciprocal is 2/1 or just 2.....all we are doing is flipping the number
3 or 3/1...reciprocal is 1/3
-5/2....reciprocal is -2/5
20/3....reciprocal is 3/20
u get it ?