68
34,2
17,2,2
68 34,2 17,2,2 2 x 2 x 17 = 68
factor tree of 68:(68) = 2 * (34)(34) = 2 * 17so prime factors are 2 * 2 * 17
68 34,2 17,2,2
68 34,2 17,2,2
68 34,2 17,2,2
68 / \ 2x34 / \ 2x17
68 34,2 17,2,2 2^2 x 17 = 68
It looks like an upside-down tree - which is how it gets its name.
68 34,2 17,2,2 2^2 x 17 = 68
253 11,23 Not much of a tree. More like a factor shrub.
68 /\ 2 34 /\ 2 17
It's 35