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Facts Practice Using Multiplication/Division Fact Triangles

What are “fact families”? • 3 x 7 = 21 is related to 7 x 3 = 21 because multiplication is commutative (a x b = b x a). • 3 x 7 = 21 also is related to 21 ÷ 7 = 3 and 21 ÷ 3 = 7 because multiplication and division are inverse operations. • So 3, 7, and 21 make up the following family of four facts: