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The number 9 would be the GCF, or greatest common factor, of 18 and 63.
For 53, 33, 18 the GCF is: 1
The GCF is 9.
9w
The GCF is 6.
The GCF is 4.
The GCF is 30.
50
The GCF is: 1
The GCF is 27.
The GCF is 1.
The GCF is 2.
The GCF is 3.
The GCF is 5.
The GCF of 125, 200 is 25.