It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
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The GCF of 70 and 100 is 10. This leaves you with 7 and 10 respectively (7/10 and 100/10). There are no further factors aside from 1.
The GCF is 10.
It is: 10
GCF(198, 160) = 2.
The GCF is 70.
The GCF of 56 and 160 is 8. The LCM is 1120.
The GCF is 5.
The greatest common factor of 90 and 160 is 1090/10 = 9160/10 = 16The GCF of 90 and 160 is 10.