It is 15.
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The Greatest Common Factor (GCF) of 45 and 75 is 15. To find the GCF, you can list the factors of each number and find the largest number that both 45 and 75 share. The factors of 45 are 1, 3, 5, 9, 15, and 45, while the factors of 75 are 1, 3, 5, 15, 25, and 75. The largest number that both 45 and 75 share is 15, making it the Greatest Common Factor.
Factors of 45: 1, 3, 5, 9, 15, 45.Factors of 75: 1, 3, 5, 15, 25, 75.Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90.GCF (45, 75, 90) = 15
The GCF of 40, 50, and 75 is 5.
Since 25 is a factor of 75, it is automatically the GCF.
It is: 15