🔒 Closed Secrets of Mental Math

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Secrets of Mental Math
(The Mathemagician's Guide to Lightning Calculation and
Amazing Math Tricks)

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Quick: What's 25 × 45? How about 742 × 300? Or 4821 ÷ 9?
Most of us, when faced with math problems like these, immediately reach for a calculator or a pen. But imagine if you could perform these and other seemingly difficult—but surprisingly easy—calculations right in your head. Seems like an impossible feat? It's not.
 
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