$\displaystyle \frac{1}{4}$\displaystyle \frac{1}{4}

$\displaystyle \frac{3}{8}$\displaystyle \frac{3}{8}

$\displaystyle \frac{1}{2}$\displaystyle \frac{1}{2}

$\displaystyle \frac{3}{4}$\displaystyle \frac{3}{4}