Eliminate memory overload and learn eight math facts per card! The Original Triangle Flash Cards were developed to teach the family of facts, showing the relationship between addition and subtraction. For example: 4 + 3 = 7, 3 + 4 = 7, 7 - 4 = 3 and 7 - 3 = 4. 120 math facts are shown on 20 cards. 2 players.
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