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The GCF of 30 and 75 is 15
In order to find the HCF of 30 and 75 you must first express them as the product of their prime factors:
30 = 2x3x5
75 = 3x5x5
The next step is to identify any common factors. In this case both numbers have a 3 and a 5 as factors. Multiply these together to find the HCF:
3x5 = 15
Thus the greatest common factor of 30 and 75 is 15.
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