In this part . . .
There are at least ten good reasons to have a Part of Tens in a For Dummies book. The chapters in this part are compact and filled with handy information. As the old TV commercial said, they are fast, fair, and friendly.
Take a look at Chapter 20 for a compact summary of ten problem-solving techniques. They work every time! Chapter 21 has ten common formulas and even variants and a few rough estimates for when you're in a hurry. Chapter 22 is a self-help book in itself. It has ten techniques for getting better at math while you do the other things in your daily routine.