720
360,2
180,2,2
90,2,2,2
45,2,2,2,2
15,3,2,2,2,2
5,3,3,2,2,2,2
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720 360,2 180,2,2 90,2,2,2 45,2,2,2,2 15,3,2,2,2,2 5,3,3,2,2,2,2
To get the Greates Common Factor (GCF) of 60 and 480 we need to factor each value first and then we choose all the copies of factors and multiply them:
83 is prime. No tree.
61 is already prime. It doesn't need a tree.
When the bottom branch consists entirely of prime numbers.