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First you find the factors of 45 and 60.

The Factors of 45 are:1,3,5,9,15,and 45

The Factors of 60 are:1,2,3,4,5,6,10,12,15,20,30,60

The GCF is the highest common number so the GCF is 15.

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Q: How do you find out the GCF of 45 60?
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