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To find the GCF of two numbers, you first split them both into their prime factors.

45 = 3x3x5

60 = 2x2x3x5

The next step is to find the common prime factors. In this case, both numbers have one 3 as a factor, and both have one 5 as a factor. To get the greatest common factor, we find the product of these common prime factors:

5x3=15

Thus the greatest common factor of 45 and 60 is 15.

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13y ago
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10y ago

It is: 15

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Q: What is the greatest factor of 45 and 60?
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