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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
Wiki User
∙ 8y agoThis answer is:
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Wiki User
∙ 14y ago72=2x2x2x3x3
45=3x3x5
common prime factors are
3x3=9
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