It is: 15
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The greatest common factors of 10 40 and 45 is 5
The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30 The factors of 45 are: 1, 3, 5, 9, 15, 45 The common factors are: 1, 3, 5, 15 The Greatest Common Factor: GCF = 15
The common factors of 30 and 45 are: 1, 3, 5, 15.
The Greatest Common Factor (GCF) is: 9
By this question you need more information. Another number is needed. The GCF (greatest common factor) of 30 and 45 is 15. So please give more information!