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No matter how much you might try to avoid numbers, we all use math every day to calculate a tip, figure out an interest rate, or estimate the cost of the groceries in your cart. But the good news is, math can be easy—and even fun—if you know how to do it all in your head.
With these simple and downright magical math tricks, you can do everyday math faster than it takes to dig out your phone and find the calculator app. Step-by-step and easy-to-memorize directions show more than 125 math operations anyone can do in their head.
Plus, it features do-it-yourself math projects, puzzles, and a bonus section for advanced mathophiles. Get ready to tackle problems such as . . .
• How to easily square any number
• How to add three-digit numbers
• How to use a mirror to measure the height of a building
• How to make a ruler out of a dollar bill
• How to use geometry to paint walls, cut floor tiling, and do other home renovations
• How to subtract numbers . . . by adding
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Portable Press is a tight-knit group of writers, researchers, and editors who are responsible for some of the publishing industry’s most popular non-fiction trivia and facts books. Aside from creating the fan-favorite Uncle John’s Bathroom Reader series (more than 16 million books in print since 1988), the Portable Press team also specializes in regional and kids’ titles, plus gift books, activity books, and whatever else strikes their fancy.
