$$3.2\times0.16=0.512$$, $$0.32\times0.16=0.0512$$,  $$32\times0.016=0.512$$, $$0.032\times160=5.12$$.  Therefore, expression $$\rm D$$ has the maximum value. 
Which of the following expression has the maximum value? 
a) $$3.2\times0.16$$ 
b) $$0.32\times0.16$$ 
c) $$32\times0.016$$ 
d) $$0.032\times160$$ 