How do you evaluate  -5/21 + 11/21?

Jun 19, 2016

$\frac{6}{21} = \frac{2}{7}$

Explanation:

It is probably easier to do if the terms are written in a different orde. As this is addition we may do that.
$\frac{11}{21} - \frac{5}{21}$

The denominators are already the same, so just subtract the numerators to get

$\frac{11 - 5}{21} = \frac{6}{21}$

In simplest form
$\frac{6}{21} = \frac{2}{7}$