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John Perri
John Perri is on page 28 of 279
— Oct 16, 2015 08:29AM
Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks

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John Perri
John Perri is on page 28 of 279
Teaching myself to calculate faster in my head.
— Oct 16, 2015 08:30AM
Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks


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