1 and 5
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Prime factor each number and choose the common factors to multiply.85=5x17155=5x315 is the greatest common factor.
The greatest common factor of the numbers 35 and 85 is 5.
The greatest common factor of 85 , 294 = 1
Oh, dude, you want me to find the common factors of 85 and 155? Alright, let's see... So, the factors of 85 are 1, 5, 17, and 85, and the factors of 155 are 1, 5, 31, and 155. The common factors are 1 and 5. There you go, math wizardry at its finest!
The greatest factor that is common to 80 and 85 is 5.