LEARNING ADVANTAGE - The Original Triangle Flash Cards - Addition & Subtraction - 20 Per Set - 3 Sets 7964 you'll have plenty to last

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LEARNING ADVANTAGE - The Original Triangle Flash Cards - Addition & Subtraction - 20 Per Set - 3 Sets 7964 you'll have plenty to lastEliminate memory overload and learn 4 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? For 2 or more players. Each card displays eight problems four are addition and four are subtraction. Relationship between addition and subtraction facts is emphasized. Students will gain efficiency in memorizing.