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Since 18 is a factor of 72, it is automatically the GCF, but if you insist...

2 x 3 x 3 = 18

2 x 2 x 2 x 3 x 3 = 72

2 x 3 x 3 = 18, the GCF

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7y ago

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Q: What the gcf of 18 and 72 using prime factorization?
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