Always start with the smallest factors.
240 / 2 = 120
120 / 2 = 60
60 / 2 = 30
30 / 2 = 15
15 / 3 = 5
done
factors are {2,2,2,2,3,5} or {2^4 * 3 * 5}
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The greatest common factor is a function of two numbers-- it is the greatest factor that the numbers have in common. The concept does not apply to a single number. Now you can use the same number twice and ask what is the greatest common factor of 240 and 240 and the answer would be 240.
IT IS PRIME there is no factor tree
The factor tree of 50:5025,25,5,25025,25,5,2
21
240 120,2 60,2,2 30,2,2,2 15,2,2,2,2 5,3,2,2,2,2