1, 3, 5, and 15 are all common factors of 45 and 60.
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The highest common integral factor is 5, because 25 = 52, five is an integral factor of both 45 and 60, and 25 is not an integral factor of either 45 or 60.
15
The Greatest Common Factor (GCF) is: 15
1 is their highest common factor.
The Greatest Common Factor of 60, 45, and 30 is 15.