I debated about whether to give this book an “additional purchase,” or a “not recommended.”  Since I really wished I could recommend it, I decided “additional purchase” was the compromise rating.  Each two-page shares a twist on a classic poem (“based on the poem…by…), in which a mathematical puzzler (or two) has been tucked.  It’s clever and fun, and the answers are provided, along with one way to show the work.  My reason for not recommending may seem overly persnickety to some, but mathematics is discipline all about precision, and there are several spots in the book where it lacks precision, either in the answer or the way it states the question.  It states that 1/9=0.11111 instead of 0.111… or using the repeating mark over the 1.  In one poem it describes the size of a garden as “eight by two” without labeling the measurements (feet, meters, yards…?), and yet the answer to the perimeter and area are stated in feet/square feet.  One poem asks readers to figure the number of teeth a shark has — after telling us how many were in the first row, and that there are four additional rows of teeth, it asks, “if each of those had half as many. How many teeth would equal plenty?” (okay, I just noticed lack of precision in punctuation as well, as that should have been a comma instead of a period at the end of that dependent clause) — Is that each row having half as many as the first row or half as many as the preceding row?  Another states that someone is being eaten “by a hippo-po-tah-tum at 4 percent per bite.”  Figuring out how many bites it would take is straightforward enough if one assumes the size of the bites stays constant, based on the percentage of the original size of the person, but significantly more complicated (not to mention gruesomely, unendingly torturous for the poor victim) if each bite is 4% of what’s left after the last bite.  As I said, I recognize that my criticisms of the book are highly nitpicky, and if they don’t bother you, you might still want the book, but math really is a subject all about precision, and though clever and fun, precision is missing several times.