Gerard W Kelly

Can you multiply 362 x .5 quickly in your head? Could you readily calculate the square of 41? How much is 635 divided by 2½? Can 727,648 be evenly divided by 8? If any of these questions took you more than a few seconds to solve, you need this book. Short-Cut Math is a concise, remarkably clear compendium of about 150 math short-cuts - timesaving tricks that provide faster, easier ways to add, subtract, multiply, and divide. By using the simple foolproof...