'The exposition is exceptionally clear, and keeps its audience in mind: in the end, this is a book for adults on mathematics for children (TM). Adults (TM) here includes parents as well as teachers; in the author (TM)s words, Every parent is automatically an educator (TM) There is considerable merit in including parents in the elementary mathematics conversation; it is a pleasure to see books like Kupferman (TM)s that explain elementary...