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indigoComputers


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Picture Books

$8.93 online

$9.50

Out of stock online

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Answers to riddles are found by solving related math problems and turning the calculator upside down.

Paperback

$9.34 online

$9.50

Out of stock online

Not available in stores

Perform amazing feats of mathematical magic, answer clever riddles, and much more with this book and a handy pocket calculator. Scores of brain-teasers, puzzles, mathematical oddities, games, and recreations to fill dozens of hours with fun and excitement.…