Calculus for Dummies is great if you want to understand the basics of calculus. Indeed, it takes you well beyond what might be seen as the basics. The Workbook is a companion text, with exercises some of which ought to be included in Calculus for Dummies. The exercises in each section of the Workbook become progressively harder, and/or quite tricky in places, and you need to return from time to time to Calculus for Dummies to reinforce your understanding of the principles there before tackling these harder/trickier questions. Fear not though as a full answer is given to each question at the end of each chapter of the Workbook. If you intend buying Calculus for Dummies then buy at the same time the companion Workbook. Both are excellent books. But don't be misled by "for Dummies" in the title. If you are a real gold-plated dummy when it comes to anything mathematical then Calculus for Dummies and the Workbook are probably not for you.