With a lively rhyme matched by its antic, woodcut-like illustrations, this book introduces children to the concept of division and remainders. Joe the ant wants to march in the Queen's parade, but is left out as the 25 ants in his squadron are divided into lines of two, three, and four. Finally, Joe divides the ants into five perfect lines, with no remainder, and can march past the Queen. MacKain's use of color and vibrating line keeps things moving, and this is a fun introduction to a basic mathematical precept, but it may be premature. Most children won't actually study the subject until well after they've outgrown the appeal of this book.