Visual/spatial deficit and math tutoring

I'm tutoring a little boy who has been diagnosed as having a visual/spatial deficit as well as some ADHD characteristics. The ADD thing isn't a big problem for me, but since my own boys are at the other end of the spectrum (highly visual) I need some new approaches and techniques that will help this child grasp math concepts.

He's in third grade, and we've just started with multiplication.

Thanks for any and all ideas.

Melissa