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The greatest common factor of 45 and 72 is 9.

45- 3 times 3 times 5

75- 2 times 2 times 2 times 3 times 3

3 times 3 = 9, the GCF

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8y ago
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Wiki User

14y ago

72=2x2x2x3x3
45=3x3x5
common prime factors are
3x3=9

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Q: What is the greatest common factor 72 of and 45?
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