Chapter 1 - Introduction to Algebraic Expressions - 1.7 Multiplication and Division of Real Numbers - 1.7 Exercise Set - Page 58: 93

$-\dfrac{1}{10}$

The given expression, $ -10 $, is equivalent to \begin{array}{l} -\dfrac{10}{1} .\end{array} To find its reciprocal, interchange the numerator and the denominator. Hence, the reciprocal of the expression, $ -\dfrac{10}{1} $, is \begin{array}{l}\require{cancel} -\dfrac{1}{10} .\end{array}