Mental Mathematics

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Being able to calculate in your head is a skill that never fails to elicit admiration. Even though most cumbersome arithmetic manipulations are nowadays carried out with the aid of calculators or computers, there is still something impressive about being able to multiply, add, subtract, or divide two huge numbers in your head. We might not be as powerful as computers any more, but it is always good to keep our minds alert. However, this is not magic, but science (or mathematics, in this case). There are many simple rules that you can follow to make mental arithmetic easier and more accurate. This book first teaches you a huge number of these simple brain techniques, and then moves to thousands of exercise problems - each with a suggested time limit - so that you can exercise your mental muscles, and get a little bit better every single day, till finally you are indistinguishable from a computer!

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