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Anonymous
The GCF is 1.
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The GCF is 4.
GCF(28, 32) = 4
Since 16 is a factor of 32, it is automatically the GCF.
The GCF is 8.
The GCF of 15 and 90 is 15.
Since 15 is a factor of 60, it is automatically the GCF.