Question

Write each of the following rational numbers with positive denominators.

$\frac{5}{-8},\frac{15}{-28},\frac{-17}{-13}$

Answer 1

We can write, $\frac{5}{-8}=\frac{5\times (-1)}{-8\times (-1)}=\frac{-5}{8}$
$\frac{15}{-28}$ can be written as $=\frac{15\times (-1)}{-28\times (-1)}=\frac{-15}{28}$
and $\frac{-17}{-13}$ can be written as $=\frac{-17\times (-1)}{-13\times (-1)}=\frac{17}{13}$ as both negative signs are cancelled.