Here is another free resource from K12 Handhelds. This is a good example of the interactivity that Mobipocket provides that we like so much.
This ebook can be used on Palm or Pocket PC and includes problem sets for:
– integers (adding, subtracting, multiplying, and dividing positive and negative integers),
– algebra (simple one- and two-step problems), and
– fractions (simplifying, adding, subtracting, multiplying, and dividing fractions).