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Eliminate memory overload and learn four math facts on each side of a card! Triangle Flash Cards teach families of facts, showing the relationship between addition and subtraction. How is 4 in one corner related to 7 and 3 in the other corners? Pair these with our multiplication and division Triangle Flash Cards to hone your skills in multiple areas. Use these with 2 or more players. For ages 3+. || Size: 7.5" triangle.