$\dfrac{1}{2}$ - = $\dfrac{1}{6}$
Use "/" to separate numerator and denominator.

Write the answer in simplest form of the fraction.

The correct answer is 1/3

Let the missing value be $x$

∴ $\dfrac{1}{2}$ - $x$ = $\dfrac{1}{6}$

$x$ = $\dfrac{1}{2}$ - $\dfrac{1}{6}$

$x$ = $\dfrac{(1 \times 3) - 1}{6}$ = $\dfrac{2}{6}$ = $\dfrac{1}{3}$