Oh, what a happy little question! To find the Greatest Common Factor (GCF) of 5, 9, and 15, we look for the largest number that divides evenly into all three. The GCF of 5, 9, and 15 is 1 because it's the largest number that can be divided into all three numbers without leaving a remainder. Just like painting, math can be a beautiful and calming experience when we take it one step at a time.
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