Done correctly, all factor trees for 180 will be the same size. Since 180 has five prime factors, there will be five branches.
180
90,2
45,2,2
15,3,2,2
5,3,3,2,2
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180 90,2 45,2,2 15,3,2,2 5,3,3,2,2 2^2 x 3^2 x 5 = 180
20 is a factor of 180 180 is a multiple of 20
factor tree of 216
The Greatest Common Factor of 36, 54, 180: 18
The prime factor tree of 280 is:140,270,2,235,2,2,27,5,2,2,2