Adult students, just like any other student, must connect to their math lessons to their daily life situations. This will make math real for them.
When I teach students about perimeter, I try to connect it with a remodeling project, applying base board around a livingroom.
When I teach about area, I connect it to painting walls or laying carpet.
If the student can connect their math lesson to a life situation that they can relate to..... they understand the lesson a whole lot better...... and quicker!