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Negative Reciprocal
Opposite Reciprocal

The result of taking the reciprocal of a number and then changing the sign. For example, the negative reciprocal of 5 is , and the negative reciprocal of is .

Note: Perpendicular lines have slopes that are negative reciprocals of each other.

 


  this page updated 28-jul-14
Mathwords: Terms and Formulas from Algebra I to Calculus
written, illustrated, and webmastered by Bruce Simmons
NCTM Web Bytes December 2004 Web Bytes March 2005 Web Bytes