# How do you subtract \frac { 13} { 14s } - \frac { 11} { 49s }?

Mar 17, 2018

$\frac{69}{98 s}$

#### Explanation:

First we find common denominators. I did by multiplying each denominator to the other fraction. Should look like this

$\frac{\left(49\right) 13}{\left(49\right) 14 s} - \frac{\left(14\right) 11}{\left(14\right) 49 s}$

Then we get
$\frac{637}{686 s} - \frac{154}{686 s}$

$\frac{637 - 154}{686 s}$

$\frac{483}{686 s}$

There is a common multiple of $7$ between the numerator and denominator. So we then divide the numerator and denominator by $7$, giving us

$\frac{69}{98 s}$