> ###
> An abacus is a great way to make abstract math concepts more
> concrete. This package includes a software-based tutorial to
> illustrate the basic use of an abacus. The tutorial presents a brief
> introduction, and illustrates with graphics, text and animation how
> to represent numbers and how to add with an abacus. A practice area
> is available after the instruction to practice the concepts
> presented.
>
>
