Subtraction Bingo with Negatives
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Click the tile showing the correct subtraction to turn that tile into a spikey. Get five spikeys in a row to win the game.
Contributed by: Chris Boucher (March 2011)
Open content licensed under CC BY-NC-SA
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"Subtraction Bingo with Negatives"
http://demonstrations.wolfram.com/SubtractionBingoWithNegatives/
Wolfram Demonstrations Project
Published: March 7 2011