# How do you simplify 21/50 div21/50?

$\frac{21}{50} \div \frac{21}{50}$
$= \frac{21}{50} \cdot \frac{50}{21}$
$= {\cancel{21}}^{\textcolor{red}{1}} / {\cancel{50}}^{\textcolor{g r e e n}{1}} \cdot {\cancel{50}}^{\textcolor{g r e e n}{1}} / {\cancel{21}}^{\textcolor{red}{1}}$
$= \frac{1}{1} \cdot \frac{1}{1}$
$= 1$