Anno's mysterious multiplying jar (ENC-007472) This book demonstrates the concept of factorials by using colorful pictures and a mysterious jar with some water that becomes a sea. The story uses pictures to depict subdivisions of the sea into an island, the island into two countries, the two countries each with three mountains, and so on until the reader has counted to 3,638,800. Not only are the subdivisions pictured, but a dot diagram is used to illustrate the process.

How much is a million? (ENC-001299) This picture book is designed to help students conceptualize large numbers such as a million, a billion, and a trillion. The realm of large numbers is introduced in this story through examples in topics ranging from whales to interstellar travel.