Word Problem

Diane loves to walk around the neighborhood and enjoy the Christmas trees that her neighbors have decorated. On one side of the street there were 10 beautifully decorated trees .  The other side of the street had 8 decorated trees.  

Hint:  If it helps, draw the Christmas Trees in the space below.

Write the math equation: ______________________

How many decorated trees were there in all?  _______

Show your work!