\frac{1}{2} = \frac{10}{20} => \frac{25}{50}= \frac{10}{20} " alt=" \frac{25}{50}= \frac{25:25}{50:25}= \frac{1}{2}\\\\ \frac{1}{2}= \frac{1*10}{2*10}= \frac{10}{20} => \frac{1}{2} = \frac{10}{20} => \frac{25}{50}= \frac{10}{20} " align="absmiddle" class="latex-formula">