A commonly used factor tree for 132 is:
132
11 12
11 4 3
11 2 4 3
Another factor tree for 132 is:
132
66 2
22 3 2
11 2 3 2
Yet another factor tree for 132 is:
132
66 2
33 2 2
11 3 2 2
Hey for the first factor tree 4 isn't prime
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The Greatest Common Factor of 99, 132, 165: 33
66
Factor tree of 40: 40 20,2 10,2,2 5,2,2,2
Here is a factor tree of eight: 8 / \ 4 2 / \ 2 2
120/132 factor out a 12 12*10/12*11 now as the factor 12 appears in both numerator and denominator it van be eliminated 10/11 -------------simplest form