The greatest common factor, or GCF, of any numbers is the largest number that divides evenly into all of the numbers. Here, that would be 1 because both 3 and 5 are prime, and they share no common factors with each other nor 8.
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8(3 + 5) = (8 x 3) + (8 x 5) = 8 x 8 = 64
GCF of 5 and 3 is 1.
factoring 120=2*2*2*3*5 88=2*2*2*11 common ones=2*2*2=8
The GCF is 1.
The GCF of 24, 40 and 56 is 8. You are left with 3, 5 and 7. There are no further common factors here aside from 1.