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Self-Working Number Magic: 101 Foolproof Tricks (Dover Books on Mathematical and Word Recreations)
SelfWorking Number Magic 101 Foolproof Tricks - Dover Books on Mathematical and Word Recreations Author:Karl Fulves Clear instructions for 101 tricks and problems, many based on important math principles. Calculations have been concealed; tricks are carefully streamlined for quick understanding and flawless performance. Master such number phenomena as Lightning Calculations, Giant Memory, Magic Squares, nearly 100 more.