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Factor them.

2 x 2 x 3 x 3 x 7 = 252

2 x 2 x 7 x 11 = 308

2 x 2 x 2 x 3 x 3 x 7 = 504

Select the common factors.

2 x 2 x 7 = 28, the GCF.

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12y ago

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