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Since 16 is a factor of 128, it is automatically the GCF.
The GCF is 16.
16 cause the highest factor for both 128 and 640
The GCF is 128.
The GCF is 2.
It is: 16
16
The GCF is: 16
The GCF of 64, 80 and 128 is 16.