As 8 = 2 x 4, any multiple of 8 has both 4 and 8 as factors: 8, 16, 24, 32, 40, ...
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The greatest factor of these numbers is the number 6, which is a factor of 6 - though not of the other two numbers.
No. Two is a factor in even numbers, which end in 0, 2, 4, 6, or 8.
2 and 4 are factors of 8. GCFs happen when you compare two or more numbers.
You need at least two numbers to find a GCF.
There cannot be a common or greatest common factor of just one number. You need two or more numbers.