A factor tree is a visual metod of breaking down any number into its consituent set of Prime number factors. in the case of 66: 66 = 33 x 2 = 11 x 3 x 2 where 11, 3 and 2 are prime numbers and cannot be split down further. Each slit can be represented visually as a branch with the composite numbers at rhe end of each twig giving the name as a factor 'tree'.
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66 33,2 11,3,2
The greatest common factor 54 and 66 is 23.
132-2 | 66-2 | 33-3 | 11
factor tree of 216
3 is the smallest number that is a factor 66 and a multiple of 3