Eliminate memory overload and learn eight math facts per card! triangle flash cards teach the family of facts, showing the relationship between multiplication and division. Example: 8 x 9 = 72,9 x 8 = 72,72 / 8 = 9, and 72 / 9 = 8.120 math facts are shown on 20 cards. 2 players. - eliminate memory overload and learn eight math facts per card! - triangle flash cards teach the family of facts, showing the relationship between multiplication and division - example: 8 x 9 = 72,9 x 8 = 72,72/ 8 = 9, and 72/9 = 8