Multiple Zombies, the second installment of the undead mathematics series is now available at the iTunes Book store. Get this book and the first installment, In Parts:Fractional Zombies, free for a limited time.
Both books are written for an audience of about 2-3rd grade. Multiple Zombies is specifically for those learning multiplication of numbers 0-10. As such, it introduces the concept of multiplication as addition of sets and includes practice problems tied to the evolving story. Each book requires an iOS or Mac device running iBooks to read and follows the story of two friends as they battle their way through a town suffering from a nasty case of zombies.