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The GCF of 16 20 and 64 is 4. You are left with 4 5 and 16. You cannot go any further as there are no more effective common factors.
4
The GCF of 16 and 64 is 16. The GCF of 48 and 64 is 16.
The GCF is 16.
The GCF for 64 20 is 4.
The GCF is 4.