So to solve this problem, we are going to have to set up a couple unit conversions and then cancel units:
[tex] (\frac{16nm}{1})*(\frac{1x10^{-9}m}{1nm} )*(\frac{1mm}{1x10^{-3}m} )=16x10^{-6}mm =1.6x10^{-5}mm [/tex]
This method can be used to convert between many different units and is a very helpful tool for questions such as these.