The main reason why people read these materials is for fun. Each page in the unit consists of dialogs between a Student and a Mentor, as well as illustrations, summaries and suggestions for further explorations and activities.
Users can skip dialogs if they wish, going directly for the summaries and activities.
There are very easy tricks that will let you get the rest of the facts as fast as if you remembered them. Also, you learn a lot of useful stuff while you figure facts out. To multiply a number by nine, multiply it by ten and subtract the number. Example Find a multiplication fact you like. Try to find as many ways to express this fact as you can.