100
50, 2
25, 2, 2
5, 5, 2, 2
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Factor Tree of 520: ........520 ......../ \ ....104 5 ...../ \ ...4..26 ../\.. /\ 2 2 2 13
Greatest common factor of 39 and 104 is 13.
39 3,13
8 is the greatest common factor
The GCF of 27, 104, and 126 is 1.