G re a t es t co mm o n f a c t or i s t h e hi g h es t n u mb er b y w hi c h 51 an d 85 c an b e d i v i d e d 51 : 51 85 : 5 17 : 17 GCF = 1 G re a t es t co mm o n f a c t or o f 51 an d 85 i s e q u a l t o 1.
The greatest common factor (GCF) of 51 and 85 is 17, which is the largest number that can divide both without leaving a remainder. The common factors of these two numbers are 1 and 17, with 17 being the greatest. Thus, the GCF is 17.
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