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4. Math

Chapter 4. Math

Numeracy (the ability to use numbers) is as important as literacy. And while people vary in mathematical aptitude, almost everyone can improve their math skills, because numbers are happy to repay the effort of making their acquaintance.

Because so many people in our culture have trouble with math, improving your math skills will not only help you directly, but can also help you look good and give you an edge at work or school. In keeping with the “mental arts” approach outlined in the Preface, most of the hacks in this chapter involve mental math: math you can do in your head.


  

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