This book is how to have fun with your calculator. You can play spelling games, combine it with cards, and do assorted tricks. Those of us of a certain age remember when you could type in numbers and spell something. My husband, reeled off his favorite numbers on the calculator without so much as a hesitation: 5318008 and 773440. Evidently this was the king of jokes for your basic junior high school math class. Hubs assures me that most guys over 50 will probably know the numbers as well.
The calculator was such a big deal when I was in high school. They were expensive and pretty limited in what they could do. By the time I was in college these scientific calculators were virtually required and people began to retire those slide rules. Any of you old timers out there still remember how to work a slide rule?