### Home > A2C > Chapter 12 > Lesson 12.1.1 > Problem12-12

12-12.

Find the sum.

1. $\frac { a } { b } + \frac { c } { d }$

Find a common denominator.

$\frac{ad+bc}{bd}$

1. $\frac { a } { b } + \frac { c } { d } + \frac { e } { f }$

Find a common denominator. If you need to, combine them two at a time.