Yes.
Consider any number a/b. The reciprocal of a/b is the number when multiplied by a/b is equal to 1, namely, b/a.
1/4 + 1/5 = 9/20
the reciprocal is a factor by which you multiply a given number so that their product is 1. ex. 3/5 is the reciprocal of of 5/3.
-0.633=-633/1000 Reciprocal = -1000/633= -1.580