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The GCF of 8 and 18 is 2.
The factors of 8 are 1, 2, 4, and 8.
The factors of 18 are 1, 2, 3, 6, 9, and 18.
The common factors are 1 and 2, so 2 is the greatest common factor.
You can also look at the prime factors to determine the GCF.
The prime factors of 8 are 2, 2, and 2.
The prime factors of 18 are 2, 3, and 3.
The prime factors in common are a single 2, so the greatest common factor is 2.
with small numbers like these, we can say 8 is not a factor of 18 so it's not 8 the other factors of 8 are 1,2,4,and 8 4 is not a factor of 18 so it would be 2 Now the other way is 8=2^3 and 18 is 3^2x2 so the 2 is the only common factor.
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