The Grapes of Math

This clever collection of puzzles could spark the interest of even the mathematically challenged. The first-time collaborators serve up 16 math riddles, and team brisk verses (""Mama mia, pizza pie,/ How many mushrooms do you spy?"") with bright computer-generated illustrations to teach problem-solving tricks and strategies. Each riddle offers a clue that nudges readers to look at the problem creatively the aforementioned ""Large Pizza to Go!,"" for instance, hints, ""Please don't count them, it's too slow,/ This hot pie was made to go!/ Let me give you some advice,/ Just do half and count it twice,"" while another riddle suggests, ""Instead of seeing groups of threes,/ Count by fives and it's a breeze!"" The simple, staccato rhymes and crisp lines of the artwork keep attention focused, while those who find themselves stumped can consult the ""Answers"" section at the back of the book, which offers an explanation of each problem and shows how to group objects together and look for patterns in order to speed up the calculation process. Whether counting fish, scallops, camel humps or ants at a picnic, this duo's enthusiasm for their subject matter is contagious. Ages 7-10. (Feb.)