3
255 = 3 x 5 x 17
243 = 35
gcf = 3
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The GCF is 9.
GCF means Greatest Common Factor. GCF of 51 and 255 will be, = 255/ 51 = 5. So, 255 is divisible by 51. So, the answer is 51. or, Factors of 51 is = 17x3 Factors of 255 is = 3x5x17 So the common factors are 3x17 which is 51.
85
9
How about: 243 = 243.0