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The prime factors of 720 are 2, 2, 2, 2, 3, 3, and 5.

The prime factors of 450 are 2, 3, 3, 5, and 5.

The prime factors they have in common are 2, 3, 3, and 5, so the greatest common factor is 2 x 3 x 3 x 5 = 90.

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Q: What is the greatest common factor of 450 and 720?
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