The GCF is 1.
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The GCF of 27 and 90 is 9.
Prime factor each number. Collect the factors that are common. Multiply the numbers together and get it. 90=2x5x3x3 27=3x3x3 3x3=9
The GCF of 15 and 90 is 15.
GCF of 90 and 75 is 15.
The GCF is 27.