# How do you add 5/6 - 8/9?

Mar 31, 2018

See explanation.

#### Explanation:

To add (or subtract) two fractions first you need to find a common denominator. Here the subtraction is:

## $\frac{5}{6} - \frac{8}{9}$

The lowest common denominator is $18$:

$\frac{5}{6} - \frac{8}{9} = \frac{5 \cdot 3}{6 \cdot 3} - \frac{8 \cdot 2}{9 \cdot 2} = \frac{15}{18} - \frac{16}{18} = - \frac{1}{18}$