The reciprocal of -19 is -1/19
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Assuming you are asking about a reciprocal rather than a recipricol(!), the answer is one divided by the number.So, for example, reciprocal of -3 = 1/(-3) = -1/3.
Flip it. The reciprocal of 3/4 is 4/3
Put a 1 over it. The reciprocal of 3 is 1/3
a recipricol of a fraction is the fraction flipped over, with the numerator in the denominators place and vice versa.
The recipricol of 1/8 is 8/1. Its just switched around.