This book is part of the story telling math series where children are taught math concepts that will help them as they age and move along in school.  Tyson is the youngest of 4 and as such he is smaller, slower, and not able to do as much as his older brothers.  But with a bit of thinking and ingenuity, he discovers that he can help out.  The help needed?  Find the missing hamster and get him back into his cage.