Which of the following pairs of fractions are not equivalent fractions?

Fill in the box to make equivalent fraction.

$\frac{2}{5}=\frac{\square }{15}$

Fill in the box to make equivalent fraction.

$\frac{\square }{18}=\frac{5}{6}$

Fill in the box to make equivalent fraction.

$\frac{1}{8}=\frac{\square }{32}$

Fill in the box to make equivalent fraction.

$\frac{4}{7}=\frac{\square }{21}$

Fill in the box to make equivalent fraction.

$\frac{5}{12}=\frac{60}{\square }$

Circle the fractions which are in the simplest form and simplify the other fractions.

$\begin{array}{cccccccccccc}\frac{27}{36}& \frac{4}{9}& \frac{8}{26}& \frac{22}{24}& \frac{1}{2}& \frac{3}{12}& \frac{1}{4}& \frac{36}{42}& \frac{7}{11}& \frac{23}{115}& \frac{2}{9}& \frac{8}{16}\end{array}$