This kit is a great value! You get a set of Addition Wrap-ups, the Addition Wrap-up Rap Audio CD and the corresponding 32 page student workbook. A $28 value if you bought everything separately, only $19.99 as a kit. This series of 32 page workbooks provide a 10-day lesson plan for learning the basic facts for Addition, Subtraction, Multiplication and Division. For extra value, each comes packaged with a full set of Wrap-ups Keys, and an audio CD of the same subject. Building on the concepts Commutative Properties, (6 8 is the same as 8 6, or 3 x 9 is the same as 9 x 3), and Inverse Operations, (since 12 - 8 = 4, then 12 - 4 = 8, or since 42 / 7 = 6, then 42 / 6 = 7), they show students how much they have learned and how little they have left as they progress through the facts. A great value with a workbook, Wrap-ups, and an audio CD, they provide the tools to help students learn quickly.