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Factor them.

2 x 3 x 3 = 18

3 x 3 x 3 x 3 x 5 = 405

Select the common factors.

3 x 3 = 9, the GCF

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2012-02-21 23:19:57
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Q: What are the greatest common factor of 18 and 405 and how did you get it?
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