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