Chapter 5 - Section 5.7 - Negative Exponents and Scientific Notation - Exercise Set - Page 409: 79

$870$

Since the exponent of $10^ 2 $ is $\text{ positive } 2,$ move the decimal point $ 2 $ places to the $\text{ right }.$ Hence, the given expression, $ 8.7\times10^2 ,$ is equivalent to \begin{array}{l}\require{cancel} 870 .\end{array}