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Children's LiteratureRock and Brock, twins with very different personalities, are both offered money for doing a few chores for their Grandpa. Each week, Grandpa offers to match the money the boys have saved from the previous week's pay. In this fashion, Brock, who saves his money, has $512.00 to spend at the end of the summer. Rock, who spent his money weekly, is broke. The rhyming text comes across as a little Seuss-like, which may have been an attempt to lure younger readers. At best, it is mildly entertaining; at worst it is annoying. The problem lies with the complicated math, which is beyond most primary students' abilities. This would be a great book to use with older elementary students, who probably will not appreciate the rhyme as much. The last few pages of the book demystify the allowance math with a nifty chart, provide an overview of interest, and a list of saving tricks. This book is not a necessary purchase, but one that would get use if you have a need for a large math collection. The same point could be presented in a more entertaining manner with Demi's One Grain of Rice. 2006, Albert Whitman & Company, Ages 8 to 14.