Answer
$.0668$ square kilometers
Work Step by Step
We are given that Hagerman Fossil Beds National Monument in Idaho contains $6.68\times10^{-2}$ square kilometers of privately owned land. Since the exponent is negative, move the decimal 2 places to the left.
Note that 2 places to the left will be 1 decimal place past the first digit (6), so we will add 1 zero before 6.
$6.68\times10^{-2}=.0668$ square kilometers