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Scientific American: Head Games - 48 Confounding Word & Math Puzzles Knowledge Cards Deck: Pomegranate, Scientific American: 9780764945502: Amazon.com: Books
Mashup Math on Twitter: "Free candy-themed #math puzzles and activities are here just in time for Halloween! https://t.co/GS6KbifjAf https://t.co/CUIPyM5Lzt" / Twitter
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