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Anonymous
The greatest common factor of 90 and 99 is 9.
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The GCF is 9.
The greatest common factor of 99 and 135 is 9.
The GCF of 15 and 90 is 15.
GCF of 90 and 75 is 15.
Since 9 is a factor of 90, it is automatically the GCF.