

Triangle shape cards are more effective than the traditional flash cards because students learn to memorize 'fact families.' Fact families are a set of three numbers that link addition and subtraction, or multiplication and division, together. For example, the numbers 4,6,10 can be added or subtracted: 6+4=10, 4+6=10, 10-4=6, 10-6=4. Presenting the numbers together helps students understand the relationship between adding and subtracting. Each number is in a corner, allowing a finger to cover one of them while viewing the other two. The student looks at the other members of the fact family and then guesses the covered number. These triangle cards are also available for multiplication/division. Parents of 3rd and 4th graders may want to consider purchasing a set which can be found online or at specialty learning stores.