See also You Can Count on Monsters [1] which presents the same kind of factorization diagrams but with each number accompanied by an illustration of a 'monster'

See also You Can Count on Monsters [1] which presents the same kind of factorization diagrams but with each number accompanied by an illustration of a 'monster'. The approach, targeting an elementary-school audience, is a little trippy but it anchors the idea of the number in a unique visual. I've given the book to a few of my nieces & nephews. [1] http://www.richardevanschwartz.com/monsters.html http://www.richardevanschwartz.com/monsters.html