The reciprocal of a number, k, is just 1/k. The other way to look at it is that the product of a number and its reciprocal is one.
The reciprocals of -0.8, -2.5, and 0 are -1.25, -0.4, and infinity, respectively.
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No, there is no reciprocal of 0.
0.25 no, 0.25 (or 1/4), is the reciprocal of 4. the reciprocal of 25 is 1/25
reciprocal of 2 over 25 = 25/2
Every number does not. 0 is a number and it does not have a reciprocal.
7/0 does not exist, but its reciprocal would be 0