"When should I roll over my mortgage?" "How much paint will it take to redo the house?" "How can I improve my first-serve percentage in tennis?" The math anxious and math avoiders among us can't even balance our checkbooks, but modern life regularly confronts us with puzzling calculations. Now Darrell Huff, best-selling author of the classic How to Lie with Statistics, offers easy-to-follow solutions (with and without a pocket calculator) to the thousand and one calculations we need to make day by day, from budgeting current expenses to planning for retirement, from purchasing a home to travel, sports, and entertainment.