Secrets of Mental Math

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Benj_0307338401_4p_fm_r1.r.qxd 5/4/06 1:37 PM Page i

SECRE+S

OF

MEN+AL MA+H

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Benj_0307338401_4p_fm_r1.r.qxd 5/4/06 1:37 PM Page iii

SECRE+S

OF

MEN+AL MA+H

The Mathemagician¡¯s Guide to Lightning Calculation

and Amazing Math Tricks

Arthur Benjamin

and Michael Shermer

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