Secrets of Mental Math: Master the Art of Mental Math – Advanced Calculation and Memorization All in your Head

April 12, 2018

And I bet “in your head” was where this cover looked good, too.

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Brad Foster

6 years ago

I was told there would be no math.

Zsuzsa

6 years ago

I’m guessing none of this mental math includes the ability to calculate what you need to do to get the correct aspect ratio.

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