So remember that with multiplying fractions, just multiply numerators with numerators and denominators with denominators.
[tex] \frac{1}{2}*\frac{1}{2}*\frac{1}{2}*\frac{1}{2}=\frac{1*1*1*1}{2*2*2*2}=\frac{1}{16} [/tex]
Your product is 1/16
