Chapter 1 - Introduction to Algebraic Expressions - 1.7 Multiplication and Division of Real Numbers - 1.7 Exercise Set - Page 58: 98

$-11$

To find the reciprocal of a number, interchange the numerator and the denominator. Hence, the reciprocal of the expression, $ \dfrac{-1}{11} $, is \begin{array}{l}\require{cancel} \dfrac{11}{-1} \\\\= -11 .\end{array}